diff --git a/packages/paperclip-runner/.gitignore b/packages/paperclip-runner/.gitignore
index cb98e73ffe5..a2a2eff9a6a 100644
--- a/packages/paperclip-runner/.gitignore
+++ b/packages/paperclip-runner/.gitignore
@@ -1,3 +1,4 @@
 /dist-browser/
+/dist-phase5/
 /playwright-report/
 /test-results/
diff --git a/packages/paperclip-runner/README.md b/packages/paperclip-runner/README.md
index 319d684b43f..220a5262cab 100644
--- a/packages/paperclip-runner/README.md
+++ b/packages/paperclip-runner/README.md
@@ -20,9 +20,12 @@ keeps Codex authentication server-side. The Phase 4b live console adds the
 browser tracer over that boundary: a live transcript and composer, same-turn
 steering, three distinct interrupt races, inline request cards,
 capability-gated goal controls, parent/child lineage, reconnect, refresh,
-replay, and a redacted protocol inspector.
+replay, and a redacted protocol inspector. Phase 5 extracts that accepted
+transport, reducer projection, hook, components, styles, and reference console
+into versioned public subpaths, then proves the surface with a second minimal
+consumer.
 
-## Phase 0–4b quick start
+## Phase 0–5 quick start
 
 From the repository root:
 
@@ -67,6 +70,9 @@ pnpm --filter @paperclipai/paperclip-runner demo:phase4b -- --host 127.0.0.1 --p
 # Phase 4b: chat with a live session in the browser.
 pnpm --filter @paperclipai/paperclip-runner console:phase4b
 pnpm --filter @paperclipai/paperclip-runner browser:dev --host 127.0.0.1 --port 4179
+
+# Phase 5: open the public-SDK reference console and mini consumer.
+pnpm --filter @paperclipai/paperclip-runner console:phase5
 ```
 
 Phase 4b provider-backed routes are loopback-only and reject wildcard/LAN
@@ -98,9 +104,13 @@ and JSON content; see the protocol-server tutorial for direct `curl` examples.
 | `demo:phase4b` | Start the package-local HTTP/SSE server with server-only Codex authentication. |
 | `console:phase4b` | Start the standalone browser devtool with the Phase 4b live console on `127.0.0.1:4180`. |
 | `record:phase4b` | Run a safe real Codex task through the demo server and record reconnect/replay evidence. |
+| `console:phase5` | Start the public-SDK reference console and mini consumer on `127.0.0.1:4181`. |
+| `test:phase5` | Run targeted browser-client, reducer-projection, and React component contract tests. |
+| `test:browser:phase5` | Exercise both consumers with the fake driver, keyboard/a11y checks, reconnect/replay, measurements, and screenshots. |
+| `record:phase5:codex` | Run both public consumers against a safe real Codex session and capture live screenshots. |
 | `browser:dev` | Start the standalone live/replay/recovery browser devtool. |
 | `test:browser` | Exercise static replay and live scenarios, then capture temporary screenshots under ignored test output. |
-| `verify` | Run the complete deterministic Phase 0 through Phase 4b acceptance sequence. |
+| `verify` | Run the complete deterministic Phase 0 through Phase 5 acceptance sequence. |
 | `verify:rootless` | Extract Debian/Ubuntu browser libraries without root, then run `verify`. |
 
 ## Navigate
@@ -119,6 +129,9 @@ and JSON content; see the protocol-server tutorial for direct `curl` examples.
 - [Phase 4b protocol/server reference](docs/phase-04b-protocol-server.md)
 - [Phase 4b live console tutorial](docs/tutorials/phase-04b-live-console.md)
 - [Phase 4b live console reference](docs/phase-04b-live-console.md)
+- [Phase 5 SDK console tutorial](docs/tutorials/phase-05-sdk-console.md)
+- [Phase 5 browser SDK reference](docs/phase-05-sdk.md)
+- [Phase 5 component decision record](docs/design/phase-5-component-decisions.md)
 - [PRP compatibility/versioning policy](docs/protocol-compatibility.md)
 - [Cumulative end-to-end tutorial](docs/tutorials/end-to-end.md)
 - [Journal guide](docs/journal.md)
@@ -126,6 +139,6 @@ and JSON content; see the protocol-server tutorial for direct `curl` examples.
 - [Implementation plan](spec/paperclip-native-runner-implementation-plan.md)
 - [Normative spike specification](spec/paperclip-native-runner-spike-spec.md)
 
-Phase 4 adds the package-local real-model reference driver and Phase 4b adds
-the package-local browser console over it. Production Paperclip integration and
-Phase 5 remain deferred.
+Phase 4 adds the package-local real-model reference driver, Phase 4b adds the
+package-local browser console, and Phase 5 extracts a reusable public SDK plus
+two standalone consumers. Production Paperclip integration remains deferred.
diff --git a/packages/paperclip-runner/docs/design/phase-5-component-decisions.md b/packages/paperclip-runner/docs/design/phase-5-component-decisions.md
new file mode 100644
index 00000000000..7716bd1b015
--- /dev/null
+++ b/packages/paperclip-runner/docs/design/phase-5-component-decisions.md
@@ -0,0 +1,70 @@
+# Phase 5 SDK Extraction Decision Record
+
+Date: 2026-08-08
+Status: implemented from the approved [Phase 5 component plan](phase-5-component-plan.md)
+
+## Outcome
+
+The accepted Phase 4b transport and reducer contracts were copied into a
+versioned `0.1.0` public surface. The reference console and a deliberately
+small second consumer import only public package subpaths. Phase 4b and the
+Phase 1–3 surfaces remain the comparison baseline.
+
+## Promoted contracts
+
+The implementation promotes the framework-free client, `useRunnerConsole`,
+all approved primitives and protocol views, and `RunnerConsoleApp`. Reducer
+state and canonical events remain the only rendering authority. File, tool,
+plan, terminal, failure, request, goal, lineage, connection, and replay views
+do not maintain private protocol state.
+
+The package exports `.`, `./browser`, `./react`, and `./styles.css`. React and
+React DOM are peers; the surface adds zero runtime dependencies.
+
+## Extension surface
+
+The implementation has exactly the five approved extension points:
+
+1. item-body renderer;
+2. request-detail renderer;
+3. Composer leading and trailing slots;
+4. scoped `--pcr-*` token overrides;
+5. Fetch/EventSource/base-URL transport injection.
+
+The mini consumer demonstrates all five. No new extension registry or
+headless contract was added during implementation.
+
+## Kept out
+
+Markdown `Response`, highlighted `CodeBlock`, a persistent Context meter, a
+command palette, headless distribution, dark mode, Tailwind/Radix, toasts,
+and transcript virtualization remain rejected for the reasons in the approved
+plan. Default text and `<pre>` output keeps protocol evidence inspectable;
+consumers can opt into rich item bodies through the one renderer contract.
+
+## Implementation findings
+
+- Event IDs must not be deduplicated by the hook. Exact duplicate delivery is
+  reducer input, so the shared reducer remains the sole duplicate authority.
+- Node types are required only for browser-test and Vite configuration. They
+  are not part of the browser runtime or public dependency surface.
+- Token enforcement must inspect CSS custom-property definitions as well as
+  component usage. The `pcr-` namespace is enforced across SDK sources.
+- The reference console renders one React tree selected at the 900px
+  breakpoint. Rendering two trees would duplicate landmarks, test IDs, and
+  live regions.
+- A real provider may explicitly disable goals. The consumer gates buttons on
+  that capability and preserves the upstream diagnostic instead of emulating
+  a goal.
+- Real-provider steering timing is not a stable visual fixture. Fake-driver
+  tests own race coverage; a safe real completion owns transport, identity,
+  redaction, reconnect, and replay evidence.
+- Minimal hosts may lack Playwright shared libraries. The package rootless
+  helper runs the same browser commands from a run-owned cache.
+
+## Compatibility rule
+
+`0.1.0` is the first frozen SDK surface. Any later removal or semantic change
+to an export, hook field, component prop, `data-slot`, extension point, or
+token needs a versioned compatibility decision. Additive protocol fields stay
+forward-compatible; the schema and shared reducer remain authoritative.
diff --git a/packages/paperclip-runner/docs/index.md b/packages/paperclip-runner/docs/index.md
index d6d833d9a38..6e098ad8083 100644
--- a/packages/paperclip-runner/docs/index.md
+++ b/packages/paperclip-runner/docs/index.md
@@ -12,6 +12,7 @@ Each tutorial starts with an explanation of what the phase is and what the phase
 - [Phase 4: run the skillless Codex driver](tutorials/phase-04-skillless-codex.md) — run a safe real-model task, inspect the exact context boundary, steer or interrupt it, and confirm one replay-safe result.
 - [Phase 4b: run the protocol demo server](tutorials/phase-04b-protocol-server.md) — exercise the server-only Codex boundary, canonical replay, typed controls, and reconnect with `curl`.
 - [Phase 4b: run the live Codex protocol console](tutorials/phase-04b-live-console.md) — chat with a live session in the browser, steer it, stop it three ways, answer its requests, change its goal, break its connection, and replay the record.
+- [Phase 5: run the SDK console and mini consumer](tutorials/phase-05-sdk-console.md) — exercise the versioned public browser/React surface in two independent consumers against fake and real drivers.
 - [Cumulative end-to-end tutorial](tutorials/end-to-end.md) — the shortest complete workflow available at the current phase.
 
 ## Reference
@@ -23,12 +24,14 @@ Each tutorial starts with an explanation of what the phase is and what the phase
 - [Phase 4 skillless Codex driver](phase-04-skillless-codex-driver.md)
 - [Phase 4b protocol and demo server](phase-04b-protocol-server.md)
 - [Phase 4b live console](phase-04b-live-console.md)
+- [Phase 5 browser SDK and reference console](phase-05-sdk.md)
 - [Engineering journal guide](journal.md)
 - [Dated shadcn/ui and AI Elements compatibility note](research/2026-08-07-ui-library-compatibility.md)
 - [Phase 4b live-console interaction map](design/phase-4b-interaction-map.md)
 - [Phase 4b component decision record (shadcn/ui, AI Elements)](design/phase-4b-component-decisions.md)
 - [Phase 5 component and SDK surface plan](design/phase-5-component-plan.md)
+- [Phase 5 SDK extraction decision record](design/phase-5-component-decisions.md)
 - [Package README](../README.md)
 
-Phase 4b is implemented and accepted. Phase 5 (SDK extraction and reference
-console) has an approved UX component plan; implementation is pending.
+Phase 5 is implemented under this standalone package boundary. Production
+Paperclip UI integration remains deferred.
diff --git a/packages/paperclip-runner/docs/phase-05-sdk.md b/packages/paperclip-runner/docs/phase-05-sdk.md
new file mode 100644
index 00000000000..0b9a49d94b3
--- /dev/null
+++ b/packages/paperclip-runner/docs/phase-05-sdk.md
@@ -0,0 +1,153 @@
+# Phase 5 Browser SDK and Reference Console
+
+## Public package surface
+
+Phase 5 freezes the first browser SDK as package version `0.1.0`.
+
+| Import | Purpose |
+| --- | --- |
+| `@paperclipai/paperclip-runner` | Protocol, reducer, and existing package contracts |
+| `@paperclipai/paperclip-runner/browser` | Framework-free HTTP/SSE client, protocol types, transcript projection |
+| `@paperclipai/paperclip-runner/react` | Hook, reference console, and reusable React components |
+| `@paperclipai/paperclip-runner/styles.css` | Scoped light-theme token and component styles |
+
+React and React DOM are peer dependencies. The extracted surface adds no
+runtime dependency. It is client-only: it uses `window`, `sessionStorage`,
+Fetch, and EventSource, so applications must mount it in the browser rather
+than render it on the server.
+
+## Framework-free client
+
+```ts
+import { createRunnerClient } from "@paperclipai/paperclip-runner/browser";
+
+const client = createRunnerClient({ baseUrl: "/api/phase4b" });
+const manifests = await client.fetchManifests();
+```
+
+`RunnerClient` exposes manifest listing; session create/read/close; event
+history and SSE streaming; turn start, steering, and interrupt; typed request
+resolution; goal operations; and reconnect. `RunnerClientError` preserves the
+HTTP status, stable error code, and redacted server message.
+
+The protocol server remains authoritative. The browser client never creates a
+second event model, invents capabilities, changes run/session/provider
+identities, or removes duplicate events before the shared reducer sees them.
+
+## React hook
+
+```tsx
+import { useRunnerConsole } from "@paperclipai/paperclip-runner/react";
+
+function Console() {
+  const runner = useRunnerConsole({ baseUrl: "/api/phase4b" });
+  return <p>{runner.connection}: {runner.replayParity ? "match" : "waiting"}</p>;
+}
+```
+
+`useRunnerConsole` returns manifests and selection, canonical server state,
+the exact event list, reducer snapshot, transcript projection, connection and
+retry state, composer state, steering acknowledgements, a single polite
+announcement channel, errors, busy state, lineage selection, replay controls,
+and verbs for every supported mutation. Durable history is re-read before a
+reconnected stream opens. Replay uses the same reducer as live state.
+
+## Components
+
+The `./react` export includes:
+
+- primitives: `Button`, `Badge`, `Card`, `Textarea`, `Tabs`, `Menu`, `Dialog`,
+  `Tooltip`, and `Banner`;
+- protocol views: `Conversation`, `Message`, `ReasoningItem`, `ToolItem`,
+  `RequestCard`, `SessionTimeline`, `Inspector`, `ReplayControls`, and
+  `ConnectionBanner`;
+- composition: `Composer`, `RunnerConsoleApp`, and `useRunnerConsole`.
+
+Components take reducer/protocol shapes. Every component owns a stable
+`data-slot` and `pcr-` class. Terminal, file, tool, plan, request, failure,
+lineage, goal, connection, and replay states come only from canonical events
+or public session state.
+
+## Five extension points
+
+These are the complete extension surface for `0.1.0`:
+
+1. `Conversation`, `Message`, `ReasoningItem`, and `ToolItem` accept
+   `renderItemBody(item)` for markdown, highlighting, or another item body.
+2. `RequestCard` accepts `renderRequestDetail(request)` for its detail region.
+3. `Composer` accepts `leadingActions` and `trailingActions`.
+4. Consumers may override `--pcr-*` properties under `.pcr-root`.
+5. `createRunnerClient` and `useRunnerConsole` accept `baseUrl`, `fetchImpl`,
+   and `eventSourceFactory` transport injection.
+
+There is no headless distribution, component registry, render-prop shell,
+dark theme, toast layer, or virtualized transcript in this version.
+
+## Transport and credential boundary
+
+```tsx
+const runner = useRunnerConsole({
+  baseUrl: "/runner",
+  fetchImpl: (input, init) => fetch(input, {
+    ...init,
+    headers: { ...Object.fromEntries(new Headers(init?.headers)), "x-app-session": appSession },
+  }),
+  eventSourceFactory: (url) => new EventSource(url),
+});
+```
+
+Transport injection is for browser-to-protocol-server authentication, proxies,
+and test doubles. Provider credentials stay on that server. Do not place a
+provider bearer token in component props, manifest text, events, diagnostics,
+browser storage, or an EventSource query string. The package demo fixes and
+validates its workspace server-side and redacts provider paths and credentials.
+
+## Tokens and contrast
+
+`styles.css` declares a light-only `color-scheme` and all visual values under
+`.pcr-root`. The shipped foreground/surface pairs are:
+
+| Foreground | Surface | Contrast |
+| --- | --- | ---: |
+| `--pcr-foreground` | `--pcr-background` | 16.4:1 |
+| `--pcr-card-foreground` | `--pcr-card` | 17.6:1 |
+| `--pcr-primary-foreground` | `--pcr-primary` | 15.6:1 |
+| `--pcr-muted-foreground` | `--pcr-muted` | 5.0:1 |
+| `--pcr-success` | `--pcr-success-surface` | 6.5:1 |
+| `--pcr-warning` | `--pcr-warning-surface` | 5.4:1 |
+| `--pcr-danger` | `--pcr-danger-surface` | 6.2:1 |
+| `--pcr-accent` | `--pcr-accent-surface` | 5.5:1 |
+
+When a consumer overrides either side of a pair, that consumer owns a new
+contrast check. Keep normal text at 4.5:1 or better. Motion respects
+`prefers-reduced-motion`. All mobile controls use the `--pcr-touch-target`
+minimum.
+
+Minimum supported widths are 320px for `Conversation`, `Composer`, and
+`Inspector`, and 280px for `RequestCard`. `RunnerConsoleApp` renders one
+responsive tree: three panes above 900px and one selected pane below it.
+
+## Keyboard and accessibility contract
+
+- The transcript is a labelled `role="log"`; consumers render the hook's
+  `announcement` once in an `aria-live="polite"` region.
+- Composer Enter sends or steers; Shift+Enter adds a line. Stop remains a
+  separate button.
+- Tabs use arrow-key roving focus plus Home/End.
+- Menu supports Enter/Space/ArrowDown, arrows, Home/End, and Escape with focus
+  restoration.
+- The native dialog traps focus, closes on Escape, and restores its trigger.
+- Reasoning and tool disclosures use native summary keyboard behavior.
+- Replay Left/Right steps; Space toggles play from the scrubber.
+- Status is always named in text, not communicated by color alone.
+- Informational banners do not steal focus. A blocking reconnect failure may.
+
+## Reference applications
+
+`examples/reference-console/` composes `RunnerConsoleApp` only from public
+exports. `examples/mini-consumer/` imports only the three public SDK subpaths
+and visibly exercises every extension point. Both run against the package fake
+driver or the real Codex driver through the same server-only adapter.
+
+See the [hand-run tutorial](tutorials/phase-05-sdk-console.md) and the
+[implementation decision record](design/phase-5-component-decisions.md).
diff --git a/packages/paperclip-runner/docs/tutorials/end-to-end.md b/packages/paperclip-runner/docs/tutorials/end-to-end.md
index beb886f3e01..5a124adec74 100644
--- a/packages/paperclip-runner/docs/tutorials/end-to-end.md
+++ b/packages/paperclip-runner/docs/tutorials/end-to-end.md
@@ -3,7 +3,7 @@
 ## What this tutorial is
 
 This tutorial combines each implemented Native Runner phase into one procedure.
-It currently includes Phase 0 through the Phase 4b protocol/server layer.
+It currently includes Phase 0 through the Phase 5 browser SDK layer.
 
 ## What this tutorial proves
 
@@ -18,6 +18,8 @@ replay modes. It also includes the Rust outbound WebSocket client, durable
 outbox, package-local mock core, recovery CLI, and recovery browser view.
 The final phase adds a skillless task envelope, direct app-server driver,
 semantic completion tools, and the same reducer/replay proof used by fixtures.
+Phase 5 freezes that browser transport and reducer projection as public SDK
+subpaths, then proves them with a reference console and a second consumer.
 
 ## Current end-to-end path
 
@@ -54,6 +56,12 @@ semantic completion tools, and the same reducer/replay proof used by fixtures.
     is rejected, and reconnect keeps the same run and session identities.
 24. Open the [Phase 4b protocol/server journal](../../knowledge/journal/2026-08-08-phase-04b-protocol-server.md)
     and its linked deterministic and real-Codex evidence.
+25. Follow [Phase 5: Run the SDK Console and Mini Consumer](phase-05-sdk-console.md).
+26. Run the fake lifecycle in both consumers, then confirm the mini consumer
+    reaches `Replay parity: match` after reconnect and replay.
+27. Run the safe real-Codex browser smoke and inspect the Phase 5 screenshots.
+28. Open the [Phase 5 journal](../../knowledge/journal/2026-08-08-phase-05-sdk.md)
+    and its linked package-acceptance evidence.
 
 The one-command form after installation is:
 
@@ -134,6 +142,14 @@ pnpm --filter @paperclipai/paperclip-runner verify:rootless
   transcript from the durable cursor;
 - no provider credential reaches the browser DOM, and adapted components add no
   new runtime dependency.
+- the browser and React contracts are versioned package subpaths with React as
+  a peer and no new runtime dependency;
+- the reference console and mini consumer import public APIs only;
+- exactly five extension points cover item bodies, request details, Composer
+  actions, token theming, and transport injection;
+- duplicate canonical events reach the shared reducer unchanged;
+- both consumers preserve identity through reconnect and reduce replay to the
+  same final state.
 
 ## Step 6: Chat with a live session in the browser
 
@@ -147,5 +163,13 @@ state above from the eleven deterministic demo chats. Add
 `PAPERCLIP_PHASE4B_DRIVER=codex` to run the identical screens against a real
 Codex session.
 
-Phase 5 remains gated on the complete Phase 4b review, QA, live-service,
-and human-checkpoint evidence.
+## Step 7: Run the reusable SDK consumers
+
+```sh
+pnpm --filter @paperclipai/paperclip-runner console:phase5
+```
+
+Open `http://127.0.0.1:4181/reference-console/` and
+`http://127.0.0.1:4181/mini-consumer/`. Follow the
+[Phase 5 tutorial](phase-05-sdk-console.md) for the deterministic lifecycle,
+real-Codex smoke, keyboard checks, and package acceptance command.
diff --git a/packages/paperclip-runner/docs/tutorials/phase-05-sdk-console.md b/packages/paperclip-runner/docs/tutorials/phase-05-sdk-console.md
new file mode 100644
index 00000000000..7fba0699147
--- /dev/null
+++ b/packages/paperclip-runner/docs/tutorials/phase-05-sdk-console.md
@@ -0,0 +1,131 @@
+# Phase 5: Run the SDK Console and Mini Consumer
+
+## What this phase is
+
+Phase 5 makes the accepted browser tracer reusable. It has a browser client,
+a React hook, reusable components, one reference console, and one small second
+consumer.
+
+The two apps use public package imports. They do not import the old demo UI.
+Provider credentials stay in the local server.
+
+## What this phase proves
+
+This tutorial proves that a second app can use the SDK without a private
+import. It also proves that live events and replay events reduce to the same
+state. You can run every hard state with the fake driver. You can then run a
+safe turn with your real local Codex login.
+
+Run commands from the repository root.
+
+## 1. Run the small SDK tests
+
+```sh
+pnpm --filter @paperclipai/paperclip-runner test:phase5
+pnpm --filter @paperclipai/paperclip-runner check:browser-tokens
+pnpm --filter @paperclipai/paperclip-runner check:forbidden-imports
+```
+
+These tests check reducer parity, components, tokens, and package boundaries.
+
+## 2. Open both apps with the fake driver
+
+```sh
+pnpm --filter @paperclipai/paperclip-runner console:phase5
+```
+
+Open these pages:
+
+- `http://127.0.0.1:4181/reference-console/`
+- `http://127.0.0.1:4181/mini-consumer/`
+
+The fake driver is the default. It does not need a provider login.
+
+## 3. Check the reference console
+
+Use the manifest list. Run these flows:
+
+1. Run **Completion**. Read the streaming and terminal messages.
+2. Run **Same-turn steering**. Type a new message while the turn is active.
+   The button says **Steer**. Check the acknowledgement.
+3. Run each interrupt flow. Confirm that the visible outcome names the race.
+4. Run **Command and file approvals**. Resolve one request. Confirm that the
+   card locks after the first click and later shows the canonical result.
+5. Run **Goal lifecycle**. Set and clear the goal from the Goal menu.
+6. Press **Drop connection**. Watch reconnect and gap recovery use the same
+   session.
+7. Enter replay. Step with Left and Right. Confirm the inspector says the
+   replay matches live state.
+8. Run **Item and turn failure**. Confirm that the exact server diagnostic is
+   part of the transcript.
+
+Resize the browser to 390 by 844. The app must show one pane at a time. It must
+not create a second hidden transcript or a horizontal page scrollbar.
+
+## 4. Check the mini consumer
+
+The mini app is intentionally small. Run a turn, steer it, stop it, resolve a
+request, set and clear a goal, drop the connection, and enter replay.
+
+Look for these proof points:
+
+- **Mini renderer** shows the custom item-body renderer.
+- **Mini detail** shows the custom request-detail renderer.
+- Set goal and Clear goal use the two Composer slots.
+- The blue accent is a local `--pcr-*` token override.
+- Fetch and EventSource are injected by the app.
+- **Replay parity: match** appears after durable history is complete.
+
+If the real driver says goals are unavailable, the two goal buttons stay
+disabled. This is correct. The SDK must not pretend the provider supports a
+feature.
+
+## 5. Run the browser acceptance tests
+
+On a machine with Playwright system libraries:
+
+```sh
+pnpm --filter @paperclipai/paperclip-runner test:browser:phase5
+```
+
+On a minimal Debian or Ubuntu machine without root access:
+
+```sh
+cd packages/paperclip-runner
+bash scripts/verify-rootless-linux.sh pnpm run test:browser:phase5
+```
+
+This runs keyboard, accessibility, reconnect, gap-recovery, replay, fake
+driver, viewport measurement, and screenshot checks.
+
+## 6. Run a real Codex session
+
+Use a machine where the local Codex CLI is already authenticated.
+
+```sh
+cd packages/paperclip-runner
+bash scripts/verify-rootless-linux.sh pnpm run record:phase5:codex
+```
+
+The test runs a safe completion through both public consumers. It checks that
+the browser contains no bearer token or `auth.json` path. The mini consumer
+then drops and reconnects the transport, enters replay, and confirms parity.
+
+Real provider timing is not used to prove every race. The deterministic fake
+driver proves steering, interrupt, requests, and goal branches. The real run
+proves the same public transport and identity boundary against Codex.
+
+## 7. Run the package acceptance command
+
+```sh
+pnpm --filter @paperclipai/paperclip-runner verify
+```
+
+Use `verify:rootless` if the host needs package-local browser libraries.
+
+## Expected result
+
+All commands exit with status 0. The fake and real apps use public imports.
+Reconnect keeps run, session, and provider identity. Replay reports `match`.
+Provider credentials do not appear in browser state, DOM text, events, or
+diagnostics.
diff --git a/packages/paperclip-runner/examples/mini-consumer/index.html b/packages/paperclip-runner/examples/mini-consumer/index.html
new file mode 100644
index 00000000000..1d9fa323876
--- /dev/null
+++ b/packages/paperclip-runner/examples/mini-consumer/index.html
@@ -0,0 +1,9 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Paperclip Runner mini consumer</title>
+  </head>
+  <body><div id="root"></div><script type="module" src="/mini-consumer/src/main.tsx"></script></body>
+</html>
diff --git a/packages/paperclip-runner/examples/mini-consumer/src/main.tsx b/packages/paperclip-runner/examples/mini-consumer/src/main.tsx
new file mode 100644
index 00000000000..6bd7448443f
--- /dev/null
+++ b/packages/paperclip-runner/examples/mini-consumer/src/main.tsx
@@ -0,0 +1,97 @@
+import * as React from "react";
+import { createRoot } from "react-dom/client";
+
+import type {
+  EventSourceLike,
+  SessionItemSnapshot,
+} from "@paperclipai/paperclip-runner/browser";
+import {
+  Composer,
+  ConnectionBanner,
+  Conversation,
+  ReplayControls,
+  RequestCard,
+  useRunnerConsole,
+} from "@paperclipai/paperclip-runner/react";
+import "@paperclipai/paperclip-runner/styles.css";
+import "./mini.css";
+
+const injectedFetch: typeof fetch = (input, init) => window.fetch(input, init);
+const injectedEventSource = (url: string): EventSourceLike => new window.EventSource(url);
+
+function MiniConsumer() {
+  // This pass-through wrapper is deliberate: the second consumer proves the
+  // fifth extension point without adding provider credentials to component
+  // props or browser state.
+  const console_ = useRunnerConsole({
+    baseUrl: "/api/phase4b",
+    fetchImpl: injectedFetch,
+    eventSourceFactory: injectedEventSource,
+  });
+  const [draft, setDraft] = React.useState("");
+  const requests = console_.transcript.filter((entry) => entry.kind === "request");
+  const conversation = console_.transcript.filter((entry) => entry.kind !== "request");
+  const customItemBody = (item: SessionItemSnapshot) => (
+    <p className="pcr-mini-custom-body"><strong>Mini renderer:</strong> {item.text}</p>
+  );
+
+  function submit() {
+    const text = draft.trim();
+    if (text.length === 0) return;
+    setDraft("");
+    if (console_.composer === "active-turn") void console_.steer(text);
+    else void console_.send(text);
+  }
+
+  return (
+    <main className="pcr-root pcr-mini-theme" data-slot="mini-consumer" data-testid="mini-consumer">
+      <header className="pcr-mini-header">
+        <p className="pcr-eyebrow">Second public-API consumer</p>
+        <h1>Runner mini consumer</h1>
+        <span className="pcr-mini-theme-proof" data-testid="mini-token-override">Mini blue token theme</span>
+        <select data-testid="mini-manifest" aria-label="Demo manifest" value={console_.selectedManifestId} onChange={(event) => console_.selectManifest(event.target.value)}>
+          {console_.manifests.map((manifest) => <option key={manifest.id} value={manifest.id}>{manifest.name}</option>)}
+        </select>
+        <button data-testid="mini-start" type="button" onClick={() => { const manifest = console_.manifests.find((entry) => entry.id === console_.selectedManifestId); void console_.start({ manifestId: console_.selectedManifestId, message: manifest?.prompt ?? "Run the SDK flow." }); }}>Start selected flow</button>
+      </header>
+      <ConnectionBanner connection={console_.connection} reconnectAttempt={console_.reconnectAttempt} onRetry={console_.retryNow} />
+      <Conversation entries={conversation} renderItemBody={customItemBody} />
+      <ul className="pcr-mini-steering" aria-label="Steering acknowledgements">
+        {console_.steeringChips.map((chip) => (
+          <li key={chip.id} data-testid="mini-steering-chip" data-status={chip.status}>
+            <strong>{chip.status}</strong> {chip.text}
+          </li>
+        ))}
+      </ul>
+      <ol className="pcr-mini-requests" aria-label="Runtime requests">
+        {requests.map((request) => (
+          <RequestCard key={request.key} request={request} onResolve={(resolution) => void console_.resolve(request.requestId, request.turnId ?? "", resolution)} renderRequestDetail={(current) => <pre className="pcr-payload">Mini detail: {JSON.stringify(current.details, null, 2)}</pre>} />
+        ))}
+      </ol>
+      <Composer
+        state={console_.composer}
+        value={draft}
+        onValueChange={setDraft}
+        onSubmit={submit}
+        onStop={() => void console_.interrupt()}
+        leadingActions={<button data-testid="mini-goal-set" type="button" disabled={console_.state?.capabilities.goals !== true} onClick={() => void console_.goal("set", { objective: "Exercise the public SDK." })}>Set goal</button>}
+        trailingActions={<button data-testid="mini-goal-clear" type="button" disabled={console_.state?.capabilities.goals !== true || console_.state.goal === null} onClick={() => void console_.goal("clear")}>Clear goal</button>}
+      />
+      <nav className="pcr-mini-actions" aria-label="SDK lifecycle controls">
+        <button data-testid="mini-drop-connection" type="button" onClick={console_.dropConnection}>Drop connection</button>
+        <button data-testid="mini-recover-gap" type="button" onClick={console_.retryNow}>Recover gap</button>
+        <button data-testid="mini-toggle-replay" type="button" disabled={console_.events.length === 0} onClick={console_.replay.active ? console_.replay.exit : console_.replay.enter}>{console_.replay.active ? "Exit replay" : "Enter replay"}</button>
+      </nav>
+      <p data-testid="mini-goal-state">
+        Goal: {console_.state?.goal?.objective ?? "none"}
+      </p>
+      {console_.replay.active ? <ReplayControls replay={console_.replay} /> : null}
+      <p className="pcr-mini-parity" data-testid="mini-replay-parity">Replay parity: {console_.replayParity === null ? "waiting" : console_.replayParity ? "match" : "mismatch"}</p>
+      <p className="pcr-visually-hidden" aria-live="polite" data-testid="mini-announcement">{console_.announcement}</p>
+    </main>
+  );
+}
+
+const root = document.getElementById("root");
+if (root === null) throw new Error("Mini consumer root is missing.");
+createRoot(root).render(<React.StrictMode><MiniConsumer /></React.StrictMode>);
diff --git a/packages/paperclip-runner/examples/mini-consumer/src/mini.css b/packages/paperclip-runner/examples/mini-consumer/src/mini.css
new file mode 100644
index 00000000000..0e92bd02c68
--- /dev/null
+++ b/packages/paperclip-runner/examples/mini-consumer/src/mini.css
@@ -0,0 +1,70 @@
+.pcr-mini-theme {
+  --pcr-accent: oklch(0.52 0.14 250);
+  --pcr-accent-foreground: oklch(0.99 0 0);
+  max-width: 48rem;
+  min-height: 100vh;
+  margin: 0 auto;
+  padding: var(--pcr-space-5);
+}
+
+.pcr-mini-header,
+.pcr-mini-actions {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: var(--pcr-space-3);
+}
+
+.pcr-mini-header button,
+.pcr-mini-actions button,
+.pcr-mini-theme button {
+  min-height: var(--pcr-touch-target);
+  padding: var(--pcr-space-2) var(--pcr-space-3);
+  border: 0.0625rem solid var(--pcr-border);
+  border-radius: var(--pcr-radius-sm);
+  background: var(--pcr-card);
+  color: var(--pcr-foreground);
+  cursor: pointer;
+}
+
+.pcr-mini-theme button:disabled {
+  cursor: not-allowed;
+  opacity: 0.5;
+}
+
+.pcr-mini-custom-body {
+  color: var(--pcr-accent);
+}
+
+.pcr-mini-theme-proof {
+  padding: var(--pcr-space-2) var(--pcr-space-3);
+  border-radius: var(--pcr-radius-sm);
+  background: var(--pcr-accent);
+  color: var(--pcr-accent-foreground);
+  font-weight: var(--pcr-weight-semibold);
+}
+
+.pcr-mini-requests {
+  display: grid;
+  gap: var(--pcr-space-3);
+  padding: 0;
+  list-style: none;
+}
+
+.pcr-mini-steering {
+  display: grid;
+  gap: var(--pcr-space-2);
+  margin: 0;
+  padding: 0;
+  list-style: none;
+}
+
+.pcr-mini-steering li {
+  padding: var(--pcr-space-2);
+  border: 0.0625rem solid var(--pcr-border);
+  border-radius: var(--pcr-radius-sm);
+}
+
+.pcr-mini-parity {
+  font-family: var(--pcr-font-mono);
+}
diff --git a/packages/paperclip-runner/examples/phase5-real.spec.ts b/packages/paperclip-runner/examples/phase5-real.spec.ts
new file mode 100644
index 00000000000..3f646c85ff0
--- /dev/null
+++ b/packages/paperclip-runner/examples/phase5-real.spec.ts
@@ -0,0 +1,56 @@
+import { mkdirSync } from "node:fs";
+import { resolve } from "node:path";
+import { fileURLToPath } from "node:url";
+
+import { expect, test } from "@playwright/test";
+
+const evidenceRoot = resolve(
+  fileURLToPath(new URL("../knowledge/evidence/phase-05", import.meta.url)),
+);
+mkdirSync(evidenceRoot, { recursive: true });
+
+test("runs the reference console through the real Codex driver", async ({ page }) => {
+  await page.goto("/reference-console/");
+  await expect(page.getByTestId("manifest-completion")).toBeVisible();
+  await page.getByTestId("manifest-completion").click();
+  await page.getByTestId("run-manifest").click();
+  await expect(page.locator("body")).toContainText("Turn completed", { timeout: 180_000 });
+  await expect(page.getByText("Credentials in browser").locator("..")).toContainText("none");
+  const body = await page.locator("body").innerText();
+  expect(body).not.toContain("Bearer ");
+  expect(body).not.toContain("auth.json");
+  await page.screenshot({
+    path: resolve(evidenceRoot, "reference-live-codex-1440x900.png"),
+  });
+});
+
+test("runs the mini consumer through real session, goal, reconnect, and replay paths", async ({
+  page,
+}) => {
+  await page.goto("/mini-consumer/");
+  await expect(page.getByRole("heading", { name: "Runner mini consumer" })).toBeVisible();
+  await page.getByLabel("Demo manifest").selectOption("completion");
+  await page.getByRole("button", { name: "Start selected flow" }).click();
+  await expect(page.getByTestId("turn-completed")).toBeVisible({ timeout: 180_000 });
+
+  if (await page.getByTestId("mini-goal-set").isEnabled()) {
+    await page.getByTestId("mini-goal-set").click();
+    await expect(page.getByTestId("mini-goal-state")).toContainText(
+      "Exercise the public SDK.",
+      { timeout: 30_000 },
+    );
+    await page.getByTestId("mini-goal-clear").click();
+    await expect(page.getByTestId("mini-goal-state")).toContainText("none", {
+      timeout: 30_000,
+    });
+  }
+
+  await page.getByTestId("mini-drop-connection").click();
+  await expect(page.getByTestId("reconnect-banner")).toBeVisible();
+  await expect(page.getByTestId("reconnect-banner")).toHaveCount(0, { timeout: 30_000 });
+  await page.getByTestId("mini-toggle-replay").click();
+  await expect(page.getByTestId("replay-controls")).toBeVisible();
+  await page.getByTestId("replay-position").press("ArrowRight");
+  await expect(page.getByTestId("mini-replay-parity")).toContainText("match");
+  await page.screenshot({ path: resolve(evidenceRoot, "mini-live-codex-1440x900.png") });
+});
diff --git a/packages/paperclip-runner/examples/phase5.spec.ts b/packages/paperclip-runner/examples/phase5.spec.ts
new file mode 100644
index 00000000000..bc9adb7d021
--- /dev/null
+++ b/packages/paperclip-runner/examples/phase5.spec.ts
@@ -0,0 +1,222 @@
+import { mkdirSync } from "node:fs";
+import { resolve } from "node:path";
+import { fileURLToPath } from "node:url";
+
+import { expect, test, type Page } from "@playwright/test";
+
+const evidenceRoot = resolve(fileURLToPath(new URL("../knowledge/evidence/phase-05", import.meta.url)));
+const DESKTOP = { width: 1440, height: 900 };
+const MOBILE = { width: 390, height: 844 };
+mkdirSync(evidenceRoot, { recursive: true });
+
+async function screenshotPair(page: Page, name: string, mobileSegment = "chat") {
+  await page.setViewportSize(DESKTOP);
+  await page.screenshot({ path: resolve(evidenceRoot, `reference-${name}-1440x900.png`) });
+  await page.setViewportSize(MOBILE);
+  await expect(page.getByRole("tab", { name: "Chat" })).toBeVisible();
+  const segment = page.getByRole("tab", { name: new RegExp(`^${mobileSegment}$`, "i") });
+  await segment.click();
+  await expect(page.locator('[data-slot="runner-console-app"]')).toBeVisible();
+  await page.screenshot({ path: resolve(evidenceRoot, `reference-${name}-390x844.png`) });
+  await page.setViewportSize(DESKTOP);
+}
+
+async function miniScreenshotPair(page: Page, name: string) {
+  await page.setViewportSize(DESKTOP);
+  await page.screenshot({ path: resolve(evidenceRoot, `mini-${name}-1440x900.png`) });
+  await page.setViewportSize(MOBILE);
+  await page.screenshot({ path: resolve(evidenceRoot, `mini-${name}-390x844.png`) });
+  await page.setViewportSize(DESKTOP);
+}
+
+async function openReference(page: Page) {
+  await page.setViewportSize(DESKTOP);
+  await page.goto("/reference-console/");
+  await expect(page.getByRole("heading", { level: 1 })).toBeVisible();
+  await expect(page.getByTestId("manifest-list")).toBeVisible();
+}
+
+async function runManifest(page: Page, id: string) {
+  await page.getByTestId(`manifest-${id}`).click();
+  await page.getByTestId("run-manifest").click();
+  await expect(page.getByTestId("connection-status")).toHaveText("connected", { timeout: 15_000 });
+}
+
+test.describe("Phase 5 reference console evidence", () => {
+  test("captures idle and streaming states at both canonical viewports", async ({ page }) => {
+    await openReference(page);
+    await expect(page.getByTestId("empty-transcript")).toBeVisible();
+    await screenshotPair(page, "idle-empty");
+
+    await runManifest(page, "completion");
+    await expect(page.getByTestId("reasoning-item")).toBeVisible();
+    await expect(page.getByTestId("composer-send")).toHaveText("Steer");
+    await screenshotPair(page, "streaming-turn");
+    await expect(page.getByTestId("turn-completed")).toBeVisible({ timeout: 20_000 });
+    expect(await page.locator("body").innerText()).not.toContain("Bearer ");
+    expect(await page.locator("body").innerText()).not.toContain("auth.json");
+  });
+
+  test("captures steering and interrupt states", async ({ page }) => {
+    await openReference(page);
+    await runManifest(page, "steering");
+    await expect(page.getByTestId("composer-send")).toHaveText("Steer");
+    await page.getByTestId("composer-input").fill("Keep it short.");
+    await page.getByTestId("composer-send").click();
+    await expect(page.getByTestId("steering-chip")).toContainText("acknowledged", { timeout: 15_000 });
+    await screenshotPair(page, "steering-acknowledged");
+
+    await page.getByRole("button", { name: "Reset demo state", exact: true }).click();
+    await page.getByTestId("reset-confirm").click();
+    await runManifest(page, "interrupt-during-generation");
+    await expect(page.getByTestId("runner-transcript")).toContainText("The tracer keeps", { timeout: 15_000 });
+    await page.getByTestId("composer-stop").click();
+    await expect(page.getByTestId("turn-interrupted")).toBeVisible({ timeout: 15_000 });
+    await screenshotPair(page, "interrupt");
+  });
+
+  test("captures request, goal, reconnect, replay, and failure states", async ({ page }) => {
+    await openReference(page);
+    await runManifest(page, "approvals");
+    await expect(page.getByTestId("request-card").first()).toHaveAttribute("data-status", "pending", { timeout: 15_000 });
+    await screenshotPair(page, "request-pending");
+    await page.getByTestId("request-action-accept").first().click();
+    await expect(page.getByTestId("request-card").first()).toHaveAttribute("data-status", "resolved", { timeout: 15_000 });
+    await screenshotPair(page, "request-resolved");
+
+    await page.getByRole("button", { name: "Reset demo state", exact: true }).click();
+    await page.getByTestId("reset-confirm").click();
+    await runManifest(page, "goals");
+    await page.getByRole("button", { name: "Goal", exact: true }).click();
+    await page.getByRole("menuitem", { name: "Set goal…" }).click();
+    await page.getByTestId("goal-objective").fill("Prove the SDK lifecycle.");
+    await page.getByTestId("goal-set-confirm").click();
+    await expect(page.getByTestId("goal-banner")).toContainText("Prove the SDK lifecycle.");
+    await screenshotPair(page, "goal-set", "session");
+
+    await page.setViewportSize(DESKTOP);
+    await page.getByTestId("drop-connection").click();
+    await expect(page.getByTestId("reconnect-banner")).toBeVisible();
+    await screenshotPair(page, "reconnect-banner");
+    await expect(page.getByTestId("connection-status")).toHaveText("connected", { timeout: 10_000 });
+
+    await page.getByTestId("toggle-replay").click();
+    await expect(page.getByTestId("replay-controls")).toBeVisible();
+    await page.getByRole("button", { name: "Step forward" }).click();
+    await screenshotPair(page, "replay-mode");
+
+    await page.setViewportSize(DESKTOP);
+    await page.getByTestId("toggle-replay").click();
+    await page.getByRole("button", { name: "Reset demo state", exact: true }).click();
+    await page.getByTestId("reset-confirm").click();
+    await runManifest(page, "failure");
+    await expect(page.getByTestId("turn-failed")).toBeVisible({ timeout: 20_000 });
+    await screenshotPair(page, "failed-turn");
+  });
+});
+
+test.describe("Phase 5 mini consumer evidence", () => {
+  test("uses public render, token, request, reconnect, and replay extension points", async ({ page }) => {
+    await page.goto("/mini-consumer/");
+    await expect(page.getByRole("heading", { name: "Runner mini consumer" })).toBeVisible();
+    await miniScreenshotPair(page, "idle");
+
+    await page.getByRole("button", { name: "Start selected flow" }).click();
+    await expect(page.getByText("Mini renderer:").first()).toBeVisible({ timeout: 15_000 });
+    await miniScreenshotPair(page, "streaming-custom-renderer-token");
+
+    await page.getByTestId("composer-input").fill("Keep the mini answer short.");
+    await expect(page.getByTestId("composer-send")).toHaveText("Steer");
+    await page.getByTestId("composer-send").click();
+    await expect(page.getByTestId("mini-steering-chip")).toContainText("acknowledged", { timeout: 15_000 });
+
+    await expect(page.getByTestId("turn-completed")).toBeVisible({ timeout: 20_000 });
+    await page.getByLabel("Demo manifest").selectOption("interrupt-during-generation");
+    await page.getByRole("button", { name: "Start selected flow" }).click();
+    await expect(page.getByTestId("composer-send")).toHaveText("Steer", { timeout: 15_000 });
+    await page.getByTestId("composer-stop").click();
+    await expect(page.getByTestId("turn-interrupted")).toBeVisible({ timeout: 15_000 });
+
+    await page.getByLabel("Demo manifest").selectOption("approvals");
+    await page.getByRole("button", { name: "Start selected flow" }).click();
+    await expect(page.getByTestId("request-card").first()).toHaveAttribute("data-status", "pending", { timeout: 15_000 });
+    await miniScreenshotPair(page, "request-pending");
+    await page.getByTestId("request-action-accept").first().click();
+    await expect(page.getByTestId("request-card").first()).toHaveAttribute("data-status", "resolved", { timeout: 15_000 });
+
+    await page.getByTestId("mini-goal-set").click();
+    await expect(page.getByTestId("mini-goal-state")).toContainText("Exercise the public SDK.", { timeout: 15_000 });
+    await page.getByTestId("mini-goal-clear").click();
+    await expect(page.getByTestId("mini-goal-state")).toContainText("none", { timeout: 15_000 });
+
+    await page.getByRole("button", { name: "Drop connection" }).click();
+    await expect(page.getByTestId("reconnect-banner")).toBeVisible();
+    await miniScreenshotPair(page, "reconnect");
+    await expect(page.getByTestId("reconnect-banner")).toHaveCount(0, { timeout: 10_000 });
+
+    await page.getByRole("button", { name: "Enter replay" }).click();
+    await expect(page.getByTestId("replay-controls")).toBeVisible();
+    await page.getByTestId("replay-position").press("ArrowRight");
+    await expect(page.getByTestId("mini-replay-parity")).toContainText("match");
+    await miniScreenshotPair(page, "replay");
+  });
+});
+
+test("meets keyboard, accessibility, responsive, and grid contracts", async ({ page }) => {
+  await openReference(page);
+  await runManifest(page, "completion");
+  await expect(page.getByTestId("turn-completed")).toBeVisible({ timeout: 20_000 });
+
+  await page.getByTestId("composer-input").fill("first");
+  await page.getByTestId("composer-input").press("Shift+Enter");
+  await expect(page.getByTestId("composer-input")).toHaveValue("first\n");
+
+  await page.getByTestId("toggle-inspector").click();
+  await page.getByRole("tab", { name: "Events" }).focus();
+  await page.keyboard.press("ArrowRight");
+  await expect(page.getByRole("tab", { name: "Requests" })).toBeFocused();
+
+  const goalMenu = page.getByRole("button", { name: "Goal", exact: true });
+  await goalMenu.focus();
+  await page.keyboard.press("ArrowDown");
+  await expect(page.getByRole("menu")).toBeVisible();
+  await expect(page.getByRole("menuitem").first()).toBeFocused();
+  await page.keyboard.press("Escape");
+  await expect(goalMenu).toBeFocused();
+  await expect(page.getByRole("menu")).toHaveCount(0);
+
+  await goalMenu.press("ArrowDown");
+  await expect(page.getByRole("menu")).toBeVisible();
+  await expect(page.getByRole("menuitem").first()).toBeFocused();
+  await page.getByRole("menuitem", { name: "Set goal…" }).click();
+  await expect(page.getByRole("dialog", { name: "Set goal" })).toBeVisible();
+  await page.keyboard.press("Escape");
+  await expect(page.getByRole("dialog", { name: "Set goal" })).not.toBeVisible();
+
+  await page.getByTestId("toggle-replay").click();
+  await page.getByTestId("replay-position").focus();
+  await page.keyboard.press("ArrowRight");
+  await expect(page.getByTestId("replay-position")).toHaveValue("1");
+  await page.keyboard.press("Space");
+  await expect(page.getByTestId("replay-controls").getByRole("button", { name: "Pause", exact: true })).toBeVisible();
+
+  expect(await page.getByRole("log").count()).toBe(1);
+  expect(await page.locator('[aria-live="polite"]').count()).toBe(1);
+  const unnamed = await page.locator("button").evaluateAll((buttons) => buttons.filter((button) => (button.getAttribute("aria-label") ?? button.textContent ?? "").trim().length === 0).length);
+  expect(unnamed).toBe(0);
+
+  const boxes = await page.evaluate(() => {
+    const root = document.querySelector<HTMLElement>('[data-slot="runner-console-app"]')!;
+    const rail = document.querySelector<HTMLElement>(".pcr-console-rail")!;
+    const center = document.querySelector<HTMLElement>(".pcr-console-center")!;
+    return { root: root.getBoundingClientRect(), rail: rail.getBoundingClientRect(), center: center.getBoundingClientRect() };
+  });
+  expect(boxes.rail.right).toBeLessThanOrEqual(boxes.center.left);
+  expect(boxes.center.right).toBeLessThanOrEqual(boxes.root.right);
+
+  await page.setViewportSize(MOBILE);
+  await expect(page.getByRole("tab", { name: "Chat" })).toBeVisible();
+  expect(await page.getByRole("log").count()).toBe(1);
+  const overflow = await page.evaluate(() => document.documentElement.scrollWidth - document.documentElement.clientWidth);
+  expect(overflow).toBeLessThanOrEqual(1);
+});
diff --git a/packages/paperclip-runner/examples/playwright.config.ts b/packages/paperclip-runner/examples/playwright.config.ts
new file mode 100644
index 00000000000..a81f0757592
--- /dev/null
+++ b/packages/paperclip-runner/examples/playwright.config.ts
@@ -0,0 +1,24 @@
+import { defineConfig } from "@playwright/test";
+
+export default defineConfig({
+  testDir: ".",
+  testMatch: "phase5.spec.ts",
+  fullyParallel: false,
+  workers: 1,
+  timeout: 120_000,
+  reporter: "line",
+  use: {
+    baseURL: "http://127.0.0.1:4192",
+    viewport: { width: 1440, height: 900 },
+  },
+  webServer: {
+    command: "pnpm exec vite --config vite.phase5.config.ts --host 127.0.0.1 --port 4192",
+    env: {
+      PAPERCLIP_PHASE4B_CHUNK_DELAY_MS: "250",
+      PAPERCLIP_PHASE4B_MAX_SESSIONS: "64",
+    },
+    url: "http://127.0.0.1:4192/reference-console/",
+    reuseExistingServer: false,
+    timeout: 30_000,
+  },
+});
diff --git a/packages/paperclip-runner/examples/playwright.real.config.ts b/packages/paperclip-runner/examples/playwright.real.config.ts
new file mode 100644
index 00000000000..e6b58d8afb5
--- /dev/null
+++ b/packages/paperclip-runner/examples/playwright.real.config.ts
@@ -0,0 +1,29 @@
+import { defineConfig } from "@playwright/test";
+
+export default defineConfig({
+  testDir: ".",
+  testMatch: "phase5-real.spec.ts",
+  fullyParallel: false,
+  workers: 1,
+  timeout: 240_000,
+  reporter: "line",
+  use: {
+    baseURL: "http://127.0.0.1:4193",
+    viewport: { width: 1440, height: 900 },
+  },
+  webServer: {
+    command: "pnpm exec vite --config vite.phase5.config.ts --host 127.0.0.1 --port 4193",
+    env: {
+      PAPERCLIP_PHASE4B_DRIVER: "codex",
+      PAPERCLIP_PHASE4B_MAX_SESSIONS: "8",
+      // The browser middleware creates its disposable working directory below
+      // this run-owned root. Tell the nested Codex process about that exact
+      // assignment so its workspace-boundary guard remains fail closed.
+      PAPERCLIP_WORKSPACE_CWD:
+        process.env.PAPERCLIP_RUN_SCRATCH_DIR ?? process.cwd(),
+    },
+    url: "http://127.0.0.1:4193/reference-console/",
+    reuseExistingServer: false,
+    timeout: 30_000,
+  },
+});
diff --git a/packages/paperclip-runner/examples/reference-console/index.html b/packages/paperclip-runner/examples/reference-console/index.html
new file mode 100644
index 00000000000..ae3f8b838b0
--- /dev/null
+++ b/packages/paperclip-runner/examples/reference-console/index.html
@@ -0,0 +1,9 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Paperclip Runner reference console</title>
+  </head>
+  <body><div id="root"></div><script type="module" src="/reference-console/src/main.tsx"></script></body>
+</html>
diff --git a/packages/paperclip-runner/examples/reference-console/src/main.tsx b/packages/paperclip-runner/examples/reference-console/src/main.tsx
new file mode 100644
index 00000000000..2a013efb9f5
--- /dev/null
+++ b/packages/paperclip-runner/examples/reference-console/src/main.tsx
@@ -0,0 +1,9 @@
+import * as React from "react";
+import { createRoot } from "react-dom/client";
+
+import { RunnerConsoleApp } from "@paperclipai/paperclip-runner/react";
+import "@paperclipai/paperclip-runner/styles.css";
+
+const root = document.getElementById("root");
+if (root === null) throw new Error("Reference console root is missing.");
+createRoot(root).render(<React.StrictMode><RunnerConsoleApp /></React.StrictMode>);
diff --git a/packages/paperclip-runner/knowledge/evidence/2026-08-08-phase-05-verification.md b/packages/paperclip-runner/knowledge/evidence/2026-08-08-phase-05-verification.md
new file mode 100644
index 00000000000..0e653d71599
--- /dev/null
+++ b/packages/paperclip-runner/knowledge/evidence/2026-08-08-phase-05-verification.md
@@ -0,0 +1,142 @@
+---
+type: Verification Evidence
+title: Phase 5 browser SDK verification
+description: Targeted and package-acceptance evidence for the versioned SDK, two public consumers, fake/real drivers, accessibility, reconnect, and replay.
+tags: [native-runner, phase-5, sdk, browser, react, codex, evidence]
+status: stable
+generated: { by: openai/codex-local, at: 2026-08-08T07:50:00Z }
+---
+
+# Scope
+
+This record covers Phase 5 under `packages/paperclip-runner/`: the versioned
+browser and React surface, scoped styles, reference console, mini consumer,
+package boundaries, fake and real drivers, documentation, and visual evidence.
+It does not change production `server/`, `ui/`, database, routes, persistence,
+or legacy adapters.
+
+# Targeted tests
+
+```sh
+pnpm --filter @paperclipai/paperclip-runner test:phase5
+pnpm --filter @paperclipai/paperclip-runner typecheck:typescript
+pnpm --filter @paperclipai/paperclip-runner typecheck:browser
+pnpm --filter @paperclipai/paperclip-runner check:browser-tokens
+pnpm --filter @paperclipai/paperclip-runner check:forbidden-imports
+```
+
+Results:
+
+- Phase 5 Vitest: **3 files, 20 tests passed**.
+- TypeScript public and browser configurations: passed.
+- Generated protocol source check: passed.
+- SDK token gate: passed.
+- Package/deep-import boundary gate: passed.
+
+Coverage includes framework-free client errors and injection, exact duplicate
+event delivery to the shared reducer, file/tool/plan projection, exact failure
+diagnostics, component `data-slot` contracts, request locking, and the five
+extension points.
+
+# Fake-driver browser acceptance
+
+```sh
+cd packages/paperclip-runner
+bash scripts/verify-rootless-linux.sh pnpm run test:browser:phase5
+```
+
+Result: **5 Playwright tests passed** in 16.4 seconds after adding an explicit
+responsive-tree readiness check before mobile evidence capture.
+
+The tests cover both public consumers, every required fake lifecycle state,
+Composer/menu/dialog/tabs/replay keyboard behavior, one polite live region,
+semantic control names, status text, reduced-motion-safe styles, exact mobile
+and desktop bounding-box measurements, reconnect and gap recovery, durable
+cursor replay, and live/replay reducer parity.
+
+# Real Codex evidence
+
+Direct server trace:
+
+```sh
+pnpm --filter @paperclipai/paperclip-runner record:phase4b -- \
+  knowledge/evidence/phase-05/phase5-real-codex-trace.json
+```
+
+Result: passed. The trace proves exact file output, a validated semantic
+result, one terminal event, continuous source sequence, stable run/session and
+provider identity after reconnect, replay, explicit unsupported-goal state,
+and absent provider credentials and host paths.
+
+Browser consumers:
+
+```sh
+cd packages/paperclip-runner
+bash scripts/verify-rootless-linux.sh pnpm run record:phase5:codex
+```
+
+Result: reference console passed and produced its live screenshot. The mini
+consumer was then rerun independently after replacing a timing-sensitive real
+steering visual with the safe completion manifest:
+
+```sh
+bash scripts/verify-rootless-linux.sh pnpm exec playwright test \
+  --config examples/playwright.real.config.ts --grep 'mini consumer'
+```
+
+Result: **1 test passed** in 14.1 seconds. Codex explicitly reported goals as
+disabled; the consumer kept its goal controls disabled. The public consumer
+completed a safe real turn, reconnected the same session, entered replay, and
+reported parity. Provider credentials were not rendered.
+
+# Screenshots
+
+The [`phase-05/`](phase-05/) directory contains 33 files:
+
+- Reference console at 1440x900 and 390x844: idle, streaming, steering,
+  interrupt, pending and resolved requests, goal, reconnect, replay, and
+  failure.
+- Mini consumer at both viewports: idle, custom renderer and token override,
+  pending request with custom detail, reconnect, and replay.
+- Live Codex reference-console and mini-consumer captures at 1440x900.
+- The redacted real Codex trace described above.
+
+Visual inspection covered a desktop idle surface, mobile pending request,
+custom renderer/token override, mini real replay, and reference real Codex
+completion. The mobile request controls fit the viewport; the live reference
+shows a completed terminal tool and passed observations.
+
+# Package acceptance
+
+```sh
+cd packages/paperclip-runner
+bash scripts/verify-rootless-linux.sh pnpm run verify
+```
+
+Result: **passed with exit status 0**. Notable totals in the cumulative run:
+
+- TypeScript: **18 files, 171 tests passed**;
+- Rust: **37 unit tests and 2 supervisor integration tests passed**;
+- boundary/recorder Node tests: **8 passed**;
+- Phase 5 targeted suite: **20 passed**;
+- accepted Phase 1–4b browser suite: **28 passed**;
+- Phase 5 browser suite: **5 passed**;
+- Phase 0 Rust/TypeScript and Phase 1 fixture/reducer parity: passed;
+- Phase 0 tracer, Phase 1 replay, Phase 2 happy path, and Phase 3 lost-ACK
+  recovery: passed.
+
+# Documentation
+
+```sh
+pnpm --filter @paperclipai/paperclip-runner docs:validate
+```
+
+Result: documentation links and OKF v0.2 validation pass.
+
+# Known provider constraints
+
+Real-provider timing is not the oracle for race screenshots. The deterministic
+driver owns steering, interrupt, request, and goal branches. Real Codex owns
+the provider authentication boundary, normalized identity, redaction, safe
+completion, reconnect, and replay. This preserves upstream terminal and
+capability truth instead of hiding a real failure or fabricating support.
diff --git a/packages/paperclip-runner/knowledge/evidence/index.md b/packages/paperclip-runner/knowledge/evidence/index.md
index 5d71ecac1b3..f28a2d1f2ec 100644
--- a/packages/paperclip-runner/knowledge/evidence/index.md
+++ b/packages/paperclip-runner/knowledge/evidence/index.md
@@ -11,3 +11,4 @@
 * [Phase 4b protocol/server verification](2026-08-08-phase-04b-protocol-server-verification.md) - Browser-resolved requests, goals, lineage, controls, reconnect, redaction, and real Codex server evidence.
 * [Phase 4b live console verification](2026-08-08-phase-04b-live-console-verification.md) - Demo-driver, transcript-model, browser, keyboard, boundary, token, and screenshot evidence for the live console.
 * [Phase 4b QA verification](2026-08-08-phase-04b-qa-verification.md) - Independent QA pass: clean-start tutorial in a real browser, deterministic demos, real Codex end-to-end session, full `verify` acceptance (exit 0), and screenshots (PAP-16837).
+* [Phase 5 browser SDK verification](2026-08-08-phase-05-verification.md) - Targeted and package-acceptance evidence for the versioned SDK, both public consumers, fake/real drivers, accessibility, reconnect, replay, and screenshots.
diff --git a/packages/paperclip-runner/knowledge/evidence/phase-05/mini-idle-1440x900.png b/packages/paperclip-runner/knowledge/evidence/phase-05/mini-idle-1440x900.png
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new file mode 100644
index 00000000000..e6056f3433e
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diff --git a/packages/paperclip-runner/knowledge/evidence/phase-05/mini-streaming-custom-renderer-token-1440x900.png b/packages/paperclip-runner/knowledge/evidence/phase-05/mini-streaming-custom-renderer-token-1440x900.png
new file mode 100644
index 00000000000..a5066aa9ece
Binary files /dev/null and b/packages/paperclip-runner/knowledge/evidence/phase-05/mini-streaming-custom-renderer-token-1440x900.png differ
diff --git a/packages/paperclip-runner/knowledge/evidence/phase-05/mini-streaming-custom-renderer-token-390x844.png b/packages/paperclip-runner/knowledge/evidence/phase-05/mini-streaming-custom-renderer-token-390x844.png
new file mode 100644
index 00000000000..0a9bc2af892
Binary files /dev/null and b/packages/paperclip-runner/knowledge/evidence/phase-05/mini-streaming-custom-renderer-token-390x844.png differ
diff --git a/packages/paperclip-runner/knowledge/evidence/phase-05/phase5-real-codex-trace.json b/packages/paperclip-runner/knowledge/evidence/phase-05/phase5-real-codex-trace.json
new file mode 100644
index 00000000000..907790cd9d2
--- /dev/null
+++ b/packages/paperclip-runner/knowledge/evidence/phase-05/phase5-real-codex-trace.json
@@ -0,0 +1,5390 @@
+{
+  "schema": "paperclip.runner.phase4b.real-evidence.v1",
+  "recordedAt": "2026-08-08T07:25:06.035Z",
+  "codexVersion": "paperclip-runner/0.132.0 (Ubuntu 24.4.0; aarch64) unknown (paperclip-runner; phase4-v2)",
+  "server": {
+    "host": "127.0.0.1",
+    "port": 41433,
+    "providerAuthentication": "server-side",
+    "credentialsExposed": false
+  },
+  "commandLog": [
+    {
+      "method": "GET",
+      "path": "/api/phase4b/health"
+    },
+    {
+      "method": "POST",
+      "path": "/api/phase4b/sessions"
+    },
+    {
+      "method": "POST",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94/steer"
+    },
+    {
+      "method": "GET",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94/events?after=0"
+    },
+    {
+      "method": "GET",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94/events?after=0"
+    },
+    {
+      "method": "GET",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94/events?after=0"
+    },
+    {
+      "method": "GET",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94/events?after=0"
+    },
+    {
+      "method": "GET",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94/events?after=0"
+    },
+    {
+      "method": "GET",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94/events?after=0"
+    },
+    {
+      "method": "GET",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94/events?after=0"
+    },
+    {
+      "method": "GET",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94/events?after=0"
+    },
+    {
+      "method": "GET",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94/events?after=0"
+    },
+    {
+      "method": "GET",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94/events?after=0"
+    },
+    {
+      "method": "GET",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94/events?after=0"
+    },
+    {
+      "method": "GET",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94/events?after=0"
+    },
+    {
+      "method": "GET",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94/events?after=0"
+    },
+    {
+      "method": "GET",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94/events?after=0"
+    },
+    {
+      "method": "GET",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94/events?after=0"
+    },
+    {
+      "method": "GET",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94/events?after=0"
+    },
+    {
+      "method": "GET",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94/events?after=0"
+    },
+    {
+      "method": "GET",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94/events?after=0"
+    },
+    {
+      "method": "GET",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94/events?after=0"
+    },
+    {
+      "method": "GET",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94/events?after=0"
+    },
+    {
+      "method": "GET",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94/events?after=0"
+    },
+    {
+      "method": "GET",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94/events?after=0"
+    },
+    {
+      "method": "GET",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94/events?after=0"
+    },
+    {
+      "method": "GET",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94/events?after=0"
+    },
+    {
+      "method": "GET",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94/events?after=0"
+    },
+    {
+      "method": "GET",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94/events?after=0"
+    },
+    {
+      "method": "GET",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94/events?after=0"
+    },
+    {
+      "method": "GET",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94/events?after=0"
+    },
+    {
+      "method": "GET",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94/events?after=0"
+    },
+    {
+      "method": "GET",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94/events?after=0"
+    },
+    {
+      "method": "GET",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94"
+    },
+    {
+      "method": "POST",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94/reconnect"
+    },
+    {
+      "method": "GET",
+      "path": "/api/phase4b/sessions/b6bc3760-d1c8-4268-9ec5-63e5d8febf94/events?after=184"
+    }
+  ],
+  "identity": {
+    "sessionId": "b6bc3760-d1c8-4268-9ec5-63e5d8febf94",
+    "runId": "phase4b-run-b6bc3760-d1c8-4268-9ec5-63e5d8febf94",
+    "normalizedSessionId": "phase4b-session-b6bc3760-d1c8-4268-9ec5-63e5d8febf94",
+    "driverSession": {
+      "driverSessionId": "019fe042-bdeb-7163-b459-105d8de31073",
+      "providerSessionId": "019fe042-bdeb-7163-b459-105d8de31073",
+      "displayId": "019fe042-bdeb-7163-b459-105d8de31073"
+    },
+    "reconnectedDriverSession": {
+      "driverSessionId": "019fe042-bdeb-7163-b459-105d8de31073",
+      "providerSessionId": "019fe042-bdeb-7163-b459-105d8de31073",
+      "displayId": "019fe042-bdeb-7163-b459-105d8de31073"
+    }
+  },
+  "capabilities": {
+    "resume": true,
+    "typedEvents": true,
+    "steering": true,
+    "interruption": true,
+    "structuredResult": true,
+    "read": true,
+    "reconciliation": true,
+    "usage": true,
+    "dynamicTools": true,
+    "runtimeRequestResolution": true,
+    "goals": false,
+    "threadLineage": true,
+    "unsupported": [
+      "goals"
+    ]
+  },
+  "goals": {
+    "set": {
+      "supported": false,
+      "diagnostic": "capability not advertised"
+    },
+    "paused": {
+      "supported": false,
+      "diagnostic": "capability not advertised"
+    },
+    "resumed": {
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+        "text": "Disposition",
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+      "payload": {
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+      "payload": {
+        "kind": "agentMessage",
+        "text": "done",
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+      "emittedAt": "2026-08-08T07:25:05.518Z",
+      "payload": {
+        "kind": "agentMessage",
+        "text": "\"}",
+        "update": {
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+    {
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+      "priority": 1,
+      "emittedAt": "2026-08-08T07:25:05.576Z",
+      "payload": {
+        "kind": "agentMessage",
+        "text": "{\"schema\":\"paperclip.run_result.v1\",\"summary\":\"Created phase4b.txt with the exact required content and verified it matches.\",\"completionClaim\":{\"contractRevision\":\"phase4b-demo-v1\",\"objectiveSatisfied\":true,\"criteria\":[{\"criterionId\":\"objective\",\"status\":\"satisfied\",\"evidenceRefs\":[\"phase4b.txt\",\"verification:content_match\"]}],\"remainingWork\":[]},\"evidence\":[{\"ref\":\"phase4b.txt\"},{\"ref\":\"verification:content_match\"}],\"verification\":[{\"commandOrCheck\":\"[ \\\"$(cat phase4b.txt)\\\" = 'phase4b real codex evidence' ]\",\"status\":\"passed\"}],\"attentionRequests\":[],\"artifacts\":[{\"kind\":\"file\",\"ref\":\"phase4b.txt\"}],\"reportedWorkDisposition\":\"done\"}",
+        "item": {
+          "type": "agentMessage",
+          "id": "msg_0f90689b4569490e016a76d9d074b881a3a7328561a5ddebec",
+          "text": "{\"schema\":\"paperclip.run_result.v1\",\"summary\":\"Created phase4b.txt with the exact required content and verified it matches.\",\"completionClaim\":{\"contractRevision\":\"phase4b-demo-v1\",\"objectiveSatisfied\":true,\"criteria\":[{\"criterionId\":\"objective\",\"status\":\"satisfied\",\"evidenceRefs\":[\"phase4b.txt\",\"verification:content_match\"]}],\"remainingWork\":[]},\"evidence\":[{\"ref\":\"phase4b.txt\"},{\"ref\":\"verification:content_match\"}],\"verification\":[{\"commandOrCheck\":\"[ \\\"$(cat phase4b.txt)\\\" = 'phase4b real codex evidence' ]\",\"status\":\"passed\"}],\"attentionRequests\":[],\"artifacts\":[{\"kind\":\"file\",\"ref\":\"phase4b.txt\"}],\"reportedWorkDisposition\":\"done\"}",
+          "phase": "final_answer",
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+        }
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+    },
+    {
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+      "priority": 1,
+      "emittedAt": "2026-08-08T07:25:05.595Z",
+      "payload": {
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+            "inputTokens": 21371,
+            "cachedInputTokens": 13056,
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+    {
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+      "eventType": "turn.completed",
+      "schemaVersion": 1,
+      "priority": 1,
+      "emittedAt": "2026-08-08T07:25:05.596Z",
+      "payload": {
+        "status": "completed",
+        "error": null
+      }
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+  "reconnectEvents": [
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+      "eventType": "session.resumed",
+      "schemaVersion": 1,
+      "priority": 1,
+      "emittedAt": "2026-08-08T07:25:06.003Z",
+      "payload": {
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+        "context": {
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+            "title": "Paperclip Runner",
+            "version": "phase4-v2"
+          },
+          "model": "gpt-5.5",
+          "modelProvider": "openai",
+          "workingDirectory": "<phase4b-workspace>",
+          "sandbox": {
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+              "writableRoots": [
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+              "networkAccess": false,
+              "excludeTmpdirEnvVar": true,
+              "excludeSlashTmp": true
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+            "rootAccess": "none",
+            "minimalRuntimeAccess": "read",
+            "workspaceAccess": "write",
+            "networkAccess": false
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+          "approvalPolicy": "on-request",
+          "baseInstructions": "Complete only the supplied task envelope. Do not discover or invoke skills. Do not call a control-plane API. Return exactly one semantic completion result; use paperclip_finish when the work is done or needs review, and paperclip_block only when work cannot continue.",
+          "instructionSources": [],
+          "instructionPolicy": {
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+            "appInstructions": false,
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+            "PATH"
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+          "modelInputKinds": [
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+            "goals": false,
+            "threadLineage": true
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+          "envelope": {
+            "schema": "paperclip.skillless_task.v1",
+            "objective": "Create phase4b.txt with exactly: phase4b real codex evidence",
+            "completionContract": {
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+                  "requirement": "Create phase4b.txt with exactly: phase4b real codex evidence"
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+            "constraints": [
+              "Work only inside the supplied working directory.",
+              "Do not discover or invoke skills.",
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+              "Return one semantic completion result."
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+    {
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+      "priority": 1,
+      "emittedAt": "2026-08-08T07:25:06.003Z",
+      "payload": {
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+        "text": "Root thread 019fe042-bdeb-7163-b459-105d8de31073",
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+      "emittedAt": "2026-08-08T07:25:06.003Z",
+      "payload": {
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+        "text": "gpt-5.5 (openai)",
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+      "eventType": "harness.diagnostic",
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+      "emittedAt": "2026-08-08T07:25:06.003Z",
+      "payload": {
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+      "eventType": "session.failed",
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+      "priority": 1,
+      "emittedAt": "2026-08-08T07:25:06.031Z",
+      "payload": {
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+    "replayAfterReconnect": true,
+    "goalCapabilityExplicit": true,
+    "credentialsAbsent": true,
+    "hostPathsAbsent": true
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+}
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new file mode 100644
index 00000000000..8da19d3c416
Binary files /dev/null and b/packages/paperclip-runner/knowledge/evidence/phase-05/reference-failed-turn-1440x900.png differ
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diff --git a/packages/paperclip-runner/knowledge/journal/2026-08-08-phase-05-sdk.md b/packages/paperclip-runner/knowledge/journal/2026-08-08-phase-05-sdk.md
new file mode 100644
index 00000000000..6c55e59611f
--- /dev/null
+++ b/packages/paperclip-runner/knowledge/journal/2026-08-08-phase-05-sdk.md
@@ -0,0 +1,83 @@
+---
+type: Engineering Journal Entry
+title: Phase 5 browser SDK and second consumer
+description: Versioned browser and React contracts, a reference console, a public-API-only mini consumer, and fake/real driver evidence.
+tags: [native-runner, phase-5, browser, sdk, react, replay, accessibility]
+status: stable
+generated: { by: openai/codex-local, at: 2026-08-08T07:45:00Z }
+entry_kind: phase
+phase: "5"
+---
+
+# Context
+
+The accepted Phase 4b console proved the protocol, interaction, and visual
+contract in one package-local application. Phase 5 needed to extract that
+surface without changing protocol authority or turning the accepted demo into
+a hidden dependency. A second consumer had to prove that the public API was
+sufficient.
+
+# Decisions
+
+1. Package version `0.1.0` freezes four public entries: `.`, `./browser`,
+   `./react`, and `./styles.css`. React and React DOM are peers. No runtime
+   dependency was added.
+2. The framework-free client owns HTTP/SSE transport only. Canonical events
+   pass unchanged into the shared reducer; browser code does not manufacture
+   identities, capabilities, request outcomes, or replay state.
+3. `useRunnerConsole` exposes the accepted hook state and verbs, restores the
+   session from a durable server cursor, and uses the same reducer for live and
+   replay projections.
+4. The component surface keeps exactly five extension points: item body,
+   request detail, Composer action slots, scoped token overrides, and transport
+   injection.
+5. `RunnerConsoleApp` reproduces the full accepted console. The mini consumer
+   is a single-column tracer bullet that imports public subpaths only and
+   visibly exercises all extension points.
+6. `.pcr-root` owns a light-only token sheet. One React tree is selected at
+   900px; duplicate hidden mobile/desktop trees are forbidden.
+7. Deterministic fake-driver tests own timing-sensitive steering, interrupt,
+   request, and goal branches. The real Codex smoke owns the provider boundary,
+   stable identities, redaction, safe completion, reconnect, and replay.
+
+Full contracts are in the [SDK reference](../../docs/phase-05-sdk.md) and
+[decision record](../../docs/design/phase-5-component-decisions.md).
+
+# Failures and corrections
+
+- The browser TypeScript configuration initially lacked Node types required by
+  Vite and Playwright configuration files. Node types were added to that
+  configuration only; they did not enter the browser runtime.
+- An early hook implementation removed repeated source event IDs. That hid
+  reducer input and violated parity authority. The hook now preserves the exact
+  stream and lets the shared reducer classify duplicates.
+- A real steering run produced an acknowledged steer and valid semantic result
+  but terminalized as a provider failure. The real browser smoke now uses the
+  safe completion manifest. Deterministic tests continue to prove all timing
+  races without weakening terminal truth.
+- The real browser server first selected the repository worktree outside its
+  assigned runtime workspace. The test config now gives Codex the run-owned
+  workspace directory.
+- Minimal-host Chromium lacked shared libraries. The existing rootless helper
+  was generalized to run a supplied package command against run-owned ARM64
+  libraries.
+
+# Evidence
+
+- Targeted client/reducer/component tests and public-import boundary tests.
+- Browser flows at 1440x900 and 390x844, including keyboard, live-region,
+  measurement, reconnect, gap recovery, and replay checks.
+- Fake-driver lifecycle screenshots plus live reference and mini Codex shots.
+- A direct real-driver trace proving exact file output, semantic result,
+  terminal uniqueness, continuous sequence, stable identities, replay,
+  explicit goal capability, and absent credentials/host paths.
+- Complete package acceptance results in
+  [Phase 5 verification](../evidence/2026-08-08-phase-05-verification.md).
+
+# Remaining questions
+
+- Dark mode and transcript virtualization remain data-gated future decisions.
+- Production Paperclip UI integration is Phase 6 work and is outside this
+  standalone package boundary.
+- An independent UX re-review owns final judgement of the attached canonical
+  screenshots.
diff --git a/packages/paperclip-runner/knowledge/journal/index.md b/packages/paperclip-runner/knowledge/journal/index.md
index 33916b1ad6c..35c6faa438d 100644
--- a/packages/paperclip-runner/knowledge/journal/index.md
+++ b/packages/paperclip-runner/knowledge/journal/index.md
@@ -12,3 +12,4 @@
 * [Phase 4b protocol and demo-server layer](2026-08-08-phase-04b-protocol-server.md) - Browser-resolved provider requests, control races, goals, lineage, replay, and server-only credentials.
 * [Phase 4b live console browser tracer](2026-08-08-phase-04b-live-console.md) - Reducer-only browser surfaces, adapted components with no new runtime dependencies, interrupt races, reconnect, replay, and the layout and stream failures found on the way.
 * [Phase 5 UX gate — reusable console and SDK component plan](2026-08-08-phase-05-ux-plan.md) - Frozen consumer-facing component contracts, five extension points, pcr- token rules, and the mini-consumer tracer flow for the SDK extraction.
+* [Phase 5 browser SDK and second consumer](2026-08-08-phase-05-sdk.md) - Versioned browser/React exports, the public reference console and mini consumer, exact reducer authority, and fake/real driver evidence.
diff --git a/packages/paperclip-runner/knowledge/log.md b/packages/paperclip-runner/knowledge/log.md
index 0448f5d3ea2..a0a69b24a61 100644
--- a/packages/paperclip-runner/knowledge/log.md
+++ b/packages/paperclip-runner/knowledge/log.md
@@ -28,4 +28,7 @@
   a deterministic demo driver, eleven demo chats, adapted shadcn/AI Elements
   components with no new runtime dependencies, and a boundary check that keeps
   it that way.
-
+* **Phase 5 browser SDK**: Extracted versioned browser, React, and scoped-style
+  exports; added a public-API-only reference console and mini consumer; proved
+  the five approved extension points, keyboard/accessibility contracts,
+  reconnect and replay parity, package boundaries, and safe real-Codex use.
diff --git a/packages/paperclip-runner/package.json b/packages/paperclip-runner/package.json
index 0f9955c0599..4a2191df89a 100644
--- a/packages/paperclip-runner/package.json
+++ b/packages/paperclip-runner/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@paperclipai/paperclip-runner",
-  "version": "0.0.0",
+  "version": "0.1.0",
   "private": true,
   "license": "MIT",
   "type": "module",
@@ -8,18 +8,29 @@
     ".": {
       "types": "./dist/index.d.ts",
       "import": "./dist/index.js"
-    }
+    },
+    "./browser": {
+      "types": "./dist/browser/index.d.ts",
+      "import": "./dist/browser/index.js"
+    },
+    "./react": {
+      "types": "./dist/react/index.d.ts",
+      "import": "./dist/react/index.js"
+    },
+    "./styles.css": "./styles.css"
   },
   "files": [
     "dist",
     "protocol",
+    "styles.css",
     "README.md"
   ],
   "scripts": {
-    "build": "pnpm run build:typescript && pnpm run build:rust && pnpm run build:browser",
+    "build": "pnpm run build:typescript && pnpm run build:rust && pnpm run build:browser && pnpm run build:phase5",
     "build:typescript": "pnpm run generate:protocol-types && tsc -p tsconfig.json",
     "build:rust": "cargo build --manifest-path runner/Cargo.toml --locked --workspace",
     "build:browser": "vite build --config vite.config.ts",
+    "build:phase5": "vite build --config vite.phase5.config.ts",
     "typecheck": "pnpm run typecheck:typescript && pnpm run typecheck:rust && pnpm run typecheck:browser",
     "typecheck:typescript": "pnpm run check:protocol-types && tsc -p tsconfig.json --noEmit",
     "typecheck:rust": "cargo check --manifest-path runner/Cargo.toml --locked --workspace",
@@ -28,6 +39,9 @@
     "test:typescript": "vitest run",
     "test:rust": "cargo test --manifest-path runner/Cargo.toml --locked --workspace",
     "test:browser": "pnpm run build:typescript && pnpm run build:phase2-binaries && pnpm run build:browser && playwright test --config devtools/browser/playwright.config.ts",
+    "test:phase5": "vitest run src/browser/client.test.ts src/browser/transcript-model.test.ts src/react/public-contract.test.tsx",
+    "test:browser:phase5": "pnpm run build:typescript && playwright test --config examples/playwright.config.ts",
+    "record:phase5:codex": "pnpm run build:typescript && playwright test --config examples/playwright.real.config.ts",
     "build:phase2-binaries": "cargo build --manifest-path runner/Cargo.toml --locked --workspace --bins",
     "generate:protocol-types": "node scripts/generate-protocol-schema-module.mjs",
     "check:protocol-types": "node scripts/generate-protocol-schema-module.mjs --check",
@@ -53,11 +67,16 @@
     "record:phase3": "pnpm run build:typescript && pnpm run build:phase2-binaries && node scripts/record-phase3-evidence.mjs",
     "record:phase3:lost-ack": "pnpm run trace:phase3 -- --fault lost-ack --output knowledge/evidence/phase-03-lost-ack.json",
     "console:phase4b": "pnpm run build:typescript && vite --config vite.config.ts --host 127.0.0.1 --port 4180",
+    "console:phase5": "pnpm run build:typescript && vite --config vite.phase5.config.ts --host 127.0.0.1 --port 4181",
     "browser:dev": "pnpm run build:typescript && pnpm run build:phase2-binaries && vite --config vite.config.ts",
     "browser:preview": "vite preview --config vite.config.ts",
-    "verify": "pnpm run build && pnpm run typecheck && pnpm run check:phase1-goldens && pnpm run test && pnpm run check:browser-tokens && pnpm run test:browser && pnpm run check:forbidden-imports && pnpm run docs:validate && pnpm run check:phase0-parity && pnpm run check:phase1-parity && pnpm run trace:phase0 && pnpm run replay:phase1 && pnpm run trace:phase2 -- --quiet && pnpm run trace:phase3",
+    "verify": "pnpm run build && pnpm run typecheck && pnpm run check:phase1-goldens && pnpm run test && pnpm run test:phase5 && pnpm run check:browser-tokens && pnpm run test:browser && pnpm run test:browser:phase5 && pnpm run check:forbidden-imports && pnpm run docs:validate && pnpm run check:phase0-parity && pnpm run check:phase1-parity && pnpm run trace:phase0 && pnpm run replay:phase1 && pnpm run trace:phase2 -- --quiet && pnpm run trace:phase3",
     "verify:rootless": "bash scripts/verify-rootless-linux.sh"
   },
+  "peerDependencies": {
+    "react": ">=18",
+    "react-dom": ">=18"
+  },
   "devDependencies": {
     "@playwright/test": "^1.61.1",
     "@types/node": "^22.20.1",
diff --git a/packages/paperclip-runner/scripts/check-browser-tokens.mjs b/packages/paperclip-runner/scripts/check-browser-tokens.mjs
index 5e39abedf50..8a20e244568 100644
--- a/packages/paperclip-runner/scripts/check-browser-tokens.mjs
+++ b/packages/paperclip-runner/scripts/check-browser-tokens.mjs
@@ -3,7 +3,11 @@ import { dirname, extname, resolve } from "node:path";
 import { fileURLToPath } from "node:url";
 
 const packageRoot = resolve(dirname(fileURLToPath(import.meta.url)), "..");
-const sourceRoot = resolve(packageRoot, "devtools/browser/src");
+const sourceRoots = [
+  resolve(packageRoot, "devtools/browser/src"),
+  resolve(packageRoot, "src/react"),
+  resolve(packageRoot, "examples"),
+];
 
 async function sourceFiles(directory) {
   const entries = await readdir(directory, { withFileTypes: true });
@@ -25,7 +29,7 @@ const componentRules = [
 ];
 const violations = [];
 
-for (const path of await sourceFiles(sourceRoot)) {
+for (const path of (await Promise.all(sourceRoots.map(sourceFiles))).flat()) {
   if (![".ts", ".tsx"].includes(extname(path))) {
     continue;
   }
@@ -37,7 +41,14 @@ for (const path of await sourceFiles(sourceRoot)) {
   }
 }
 
-const styles = await readFile(resolve(sourceRoot, "styles.css"), "utf8");
+for (const path of await sourceFiles(resolve(packageRoot, "src/react"))) {
+  if (![".ts", ".tsx"].includes(extname(path))) continue;
+  if (/\bui-[a-z-]+/.test(await readFile(path, "utf8"))) {
+    violations.push(`${path.slice(packageRoot.length + 1)}: legacy ui- class name`);
+  }
+}
+
+const styles = await readFile(resolve(packageRoot, "devtools/browser/src/styles.css"), "utf8");
 for (const token of [
   "--background",
   "--foreground",
@@ -57,6 +68,58 @@ for (const token of [
   }
 }
 
+const sdkStyles = await readFile(resolve(packageRoot, "styles.css"), "utf8");
+for (const token of [
+  "--pcr-background",
+  "--pcr-foreground",
+  "--pcr-card",
+  "--pcr-primary",
+  "--pcr-muted",
+  "--pcr-border",
+  "--pcr-ring",
+  "--pcr-font-sans",
+  "--pcr-font-mono",
+  "--pcr-space-1",
+  "--pcr-radius-sm",
+  "--pcr-motion-fast",
+  "--pcr-touch-target",
+]) {
+  if (!sdkStyles.includes(`${token}:`)) {
+    violations.push(`styles.css: missing ${token}`);
+  }
+}
+if (!sdkStyles.startsWith(".pcr-root {")) {
+  violations.push("styles.css: token sheet must be scoped to .pcr-root");
+}
+if (sdkStyles.includes(":root")) {
+  violations.push("styles.css: SDK tokens may not leak onto :root");
+}
+if (sdkStyles.includes("\\n")) {
+  violations.push("styles.css: contains a literal \\n escape sequence");
+}
+if (/--pcr---|\.pcr-[a-z-]+--pcr-/i.test(sdkStyles)) {
+  violations.push("styles.css: malformed repeated pcr prefix");
+}
+const sdkTokenNames = new Set([
+  ...[...sdkStyles.matchAll(/--([a-z][a-z0-9-]*)\s*:/gi)].map((match) => match[1]),
+  ...[...sdkStyles.matchAll(/var\(\s*--([a-z][a-z0-9-]*)/gi)].map(
+    (match) => match[1],
+  ),
+]);
+for (const tokenName of sdkTokenNames) {
+  if (!tokenName.startsWith("pcr-")) {
+    violations.push(`styles.css: unprefixed SDK token --${tokenName}`);
+  }
+}
+const cssWithoutComments = sdkStyles.replaceAll(/\/\*[\s\S]*?\*\//g, "");
+const openBraces = [...cssWithoutComments].filter((character) => character === "{").length;
+const closeBraces = [...cssWithoutComments].filter((character) => character === "}").length;
+if (openBraces !== closeBraces) {
+  violations.push(
+    `styles.css: unbalanced braces (${openBraces} open, ${closeBraces} close)`,
+  );
+}
+
 if (violations.length > 0) {
   process.stderr.write(`Standalone browser token check failed:\n- ${violations.join("\n- ")}\n`);
   process.exitCode = 1;
diff --git a/packages/paperclip-runner/scripts/check-forbidden-imports.test.mjs b/packages/paperclip-runner/scripts/check-forbidden-imports.test.mjs
index 6c48f5e81e8..f4dc12e447c 100644
--- a/packages/paperclip-runner/scripts/check-forbidden-imports.test.mjs
+++ b/packages/paperclip-runner/scripts/check-forbidden-imports.test.mjs
@@ -48,3 +48,14 @@ test("a negative fixture proves that a browser UI runtime import is rejected", a
   assert.match(violations[0].reason, /adapts component source/);
   assert.ok(violations[0].file.startsWith(defaultPackageRoot));
 });
+
+test("a negative fixture proves that an SDK consumer deep import is rejected", async () => {
+  const violations = await checkForbiddenImports({
+    scanRoots: ["test-fixtures/forbidden-sdk-consumer/examples"],
+    cargoRoots: [],
+    checkManifest: false,
+  });
+
+  assert.equal(violations.length, 1);
+  assert.match(violations[0].reason, /may not deep-import/);
+});
diff --git a/packages/paperclip-runner/scripts/lib/forbidden-imports.mjs b/packages/paperclip-runner/scripts/lib/forbidden-imports.mjs
index 0c67c1d2dfd..1c3c822bfe2 100644
--- a/packages/paperclip-runner/scripts/lib/forbidden-imports.mjs
+++ b/packages/paperclip-runner/scripts/lib/forbidden-imports.mjs
@@ -80,12 +80,32 @@ function isForbiddenBrowserPackage(specifier) {
 }
 
 function violationReason({ file, packageRoot, specifier }) {
-  if (specifier.startsWith("@paperclipai/") && specifier !== "@paperclipai/paperclip-runner") {
+  const relativeFile = relative(packageRoot, file).split(/[\\/]/).join("/");
+  const isExampleConsumer = relativeFile.startsWith("examples/");
+  const publicRunnerImports = new Set([
+    "@paperclipai/paperclip-runner/browser",
+    "@paperclipai/paperclip-runner/react",
+    "@paperclipai/paperclip-runner/styles.css",
+  ]);
+  if (
+    specifier.startsWith("@paperclipai/paperclip-runner/") &&
+    !publicRunnerImports.has(specifier)
+  ) {
+    return "runner consumers may import only declared public subpaths";
+  }
+  if (isExampleConsumer && specifier === "@paperclipai/paperclip-runner") {
+    return "runner consumers may import only browser, react, and styles.css public subpaths";
+  }
+  if (
+    specifier.startsWith("@paperclipai/") &&
+    specifier !== "@paperclipai/paperclip-runner" &&
+    !publicRunnerImports.has(specifier)
+  ) {
     return "Paperclip workspace packages are outside the standalone boundary";
   }
 
   if (
-    relative(packageRoot, file).split(/[\\/]/).join("/").includes("devtools/browser/") &&
+    ["devtools/browser/", "src/react/", "examples/"].some((root) => relativeFile.includes(root)) &&
     isForbiddenBrowserPackage(specifier)
   ) {
     return "the standalone browser app adapts component source instead of adopting its runtime";
@@ -100,6 +120,17 @@ function violationReason({ file, packageRoot, specifier }) {
     if (!isInside(packageRoot, resolvedImport)) {
       return "relative imports may not escape packages/paperclip-runner";
     }
+    const segments = relativeFile.split("/");
+    const examplesIndex = segments.indexOf("examples");
+    if (examplesIndex >= 0 && segments[examplesIndex + 1] !== undefined) {
+      const consumerRoot = resolve(
+        packageRoot,
+        segments.slice(0, examplesIndex + 2).join("/"),
+      );
+      if (!isInside(consumerRoot, resolvedImport)) {
+        return "example consumers may not deep-import package or demo internals";
+      }
+    }
   }
 
   return null;
@@ -172,7 +203,7 @@ async function cargoManifestViolations(packageRoot, cargoRoots) {
 
 export async function checkForbiddenImports({
   packageRoot = defaultPackageRoot,
-  scanRoots = ["src", "scripts", "runner"],
+  scanRoots = ["src", "scripts", "runner", "examples"],
   cargoRoots = ["runner"],
   checkManifest = true,
 } = {}) {
diff --git a/packages/paperclip-runner/scripts/verify-rootless-linux.sh b/packages/paperclip-runner/scripts/verify-rootless-linux.sh
index 2db196573f0..c34ddf94567 100644
--- a/packages/paperclip-runner/scripts/verify-rootless-linux.sh
+++ b/packages/paperclip-runner/scripts/verify-rootless-linux.sh
@@ -78,5 +78,9 @@ case "$debian_architecture" in
 esac
 
 rootless_library_path="$rootless_deps_dir/usr/lib/$library_triplet:$rootless_deps_dir/lib/$library_triplet:$rootless_deps_dir/usr/lib"
-printf 'Running Phase 2 verification with rootless browser libraries from %s.\n' "$rootless_deps_dir"
-LD_LIBRARY_PATH="$rootless_library_path${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}" pnpm run verify
+printf 'Running verification with rootless browser libraries from %s.\n' "$rootless_deps_dir"
+if [[ $# -gt 0 ]]; then
+  LD_LIBRARY_PATH="$rootless_library_path${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}" "$@"
+else
+  LD_LIBRARY_PATH="$rootless_library_path${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}" pnpm run verify
+fi
diff --git a/packages/paperclip-runner/src/browser/client.test.ts b/packages/paperclip-runner/src/browser/client.test.ts
new file mode 100644
index 00000000000..4bcff69101e
--- /dev/null
+++ b/packages/paperclip-runner/src/browser/client.test.ts
@@ -0,0 +1,79 @@
+import { describe, expect, it, vi } from "vitest";
+
+import type { PrpEvent } from "../protocol/phase1-contract.js";
+import {
+  createRunnerClient,
+  RunnerClientError,
+  type EventSourceLike,
+} from "./client.js";
+
+function json(body: unknown, status = 200): Response {
+  return new Response(JSON.stringify(body), {
+    status,
+    headers: { "content-type": "application/json" },
+  });
+}
+
+describe("public runner browser client", () => {
+  it("uses an injected fetch transport and normalizes the base URL", async () => {
+    const calls: Array<{ input: string; init?: RequestInit }> = [];
+    const fetchImpl = vi.fn(async (input: RequestInfo | URL, init?: RequestInit) => {
+      calls.push({ input: String(input), ...(init === undefined ? {} : { init }) });
+      return json({ manifests: [{ id: "completion" }] });
+    }) as typeof fetch;
+    const client = createRunnerClient({ baseUrl: "https://runner.test/api/", fetchImpl });
+
+    await expect(client.fetchManifests()).resolves.toEqual([{ id: "completion" }]);
+    expect(calls[0]?.input).toBe("https://runner.test/api/manifests");
+  });
+
+  it("preserves structured status and code on server errors", async () => {
+    const fetchImpl = vi.fn(async () => json({ error: "stale_turn", message: "Turn ended." }, 409)) as unknown as typeof fetch;
+    const client = createRunnerClient({ fetchImpl });
+
+    await expect(client.startTurn("session", "hello")).rejects.toEqual(
+      expect.objectContaining<Partial<RunnerClientError>>({
+        name: "RunnerClientError",
+        status: 409,
+        code: "stale_turn",
+        message: "Turn ended.",
+      }),
+    );
+  });
+
+  it("injects EventSource without changing canonical events or reconnect cursor", () => {
+    let url = "";
+    let closed = false;
+    const source: EventSourceLike = {
+      onopen: null,
+      onmessage: null,
+      onerror: null,
+      close: () => { closed = true; },
+    };
+    const client = createRunnerClient({
+      fetchImpl: vi.fn() as unknown as typeof fetch,
+      eventSourceFactory: (nextUrl) => { url = nextUrl; return source; },
+    });
+    const event = {
+      schema: "paperclip.prp.event.v1",
+      sourceEventId: "event-9",
+      sourceKind: "harness",
+      sourceInstanceId: "driver",
+      sourceSeq: 9,
+      emittedAt: "2026-08-08T00:00:00.000Z",
+      eventType: "item.delta",
+      payload: { text: "exact" },
+    } as PrpEvent;
+    const onEvent = vi.fn();
+    const onError = vi.fn();
+    const handle = client.openEventStream("session/id", 8, { onEvent, onError });
+
+    expect(url).toBe("/api/phase4b/sessions/session%2Fid/stream?after=8");
+    source.onmessage?.({ data: JSON.stringify(event) } as MessageEvent<string>);
+    expect(onEvent).toHaveBeenCalledWith(event);
+    source.onmessage?.({ data: "not json" } as MessageEvent<string>);
+    expect(onError).toHaveBeenCalledOnce();
+    handle.close();
+    expect(closed).toBe(true);
+  });
+});
diff --git a/packages/paperclip-runner/src/browser/client.ts b/packages/paperclip-runner/src/browser/client.ts
new file mode 100644
index 00000000000..00163525b36
--- /dev/null
+++ b/packages/paperclip-runner/src/browser/client.ts
@@ -0,0 +1,218 @@
+import type { PrpEvent } from "../protocol/phase1-contract.js";
+import type {
+  GoalOperation,
+  ManifestSummary,
+  RunnerSessionState,
+} from "./protocol.js";
+
+export interface RunnerClientErrorBody {
+  error?: unknown;
+  message?: unknown;
+}
+
+export class RunnerClientError extends Error {
+  readonly status: number;
+  readonly code: string;
+
+  constructor(status: number, code: string, message: string) {
+    super(message);
+    this.name = "RunnerClientError";
+    this.status = status;
+    this.code = code;
+  }
+}
+
+export interface EventSourceLike {
+  onopen: ((event: Event) => void) | null;
+  onmessage: ((event: MessageEvent<string>) => void) | null;
+  onerror: ((event: Event) => void) | null;
+  close(): void;
+}
+
+export type EventSourceFactory = (url: string) => EventSourceLike;
+
+export interface RunnerClientOptions {
+  /** Defaults to the package-local reference protocol server. */
+  baseUrl?: string;
+  /** Inject a credential-aware fetch wrapper without exposing credentials to components. */
+  fetchImpl?: typeof fetch;
+  /** Inject an EventSource-compatible transport for auth, proxies, or tests. */
+  eventSourceFactory?: EventSourceFactory;
+}
+
+export interface EventStreamHandle {
+  close(): void;
+}
+
+export interface RunnerClient {
+  fetchManifests(): Promise<ManifestSummary[]>;
+  createSession(input: {
+    manifest: string;
+    objective: string;
+    message?: string;
+    startTurn?: boolean;
+  }): Promise<RunnerSessionState>;
+  readSession(sessionId: string): Promise<RunnerSessionState>;
+  readEvents(
+    sessionId: string,
+    after?: number,
+  ): Promise<{ events: PrpEvent[]; cursor: number; replay: boolean }>;
+  startTurn(sessionId: string, text: string): Promise<RunnerSessionState>;
+  steerTurn(sessionId: string, turnId: string, text: string): Promise<RunnerSessionState>;
+  interruptTurn(sessionId: string, turnId: string | null): Promise<RunnerSessionState>;
+  resolveRequest(
+    sessionId: string,
+    requestId: string,
+    turnId: string,
+    resolution: Record<string, unknown>,
+  ): Promise<RunnerSessionState>;
+  goalOperation(
+    sessionId: string,
+    operation: GoalOperation,
+    body?: Record<string, unknown>,
+  ): Promise<RunnerSessionState>;
+  reconnectSession(sessionId: string): Promise<RunnerSessionState>;
+  closeSession(sessionId: string): Promise<void>;
+  openEventStream(
+    sessionId: string,
+    after: number,
+    handlers: {
+      onEvent: (event: PrpEvent) => void;
+      onOpen?: () => void;
+      onError?: () => void;
+    },
+  ): EventStreamHandle;
+}
+
+function normalizedBaseUrl(baseUrl: string): string {
+  return baseUrl.endsWith("/") ? baseUrl.slice(0, -1) : baseUrl;
+}
+
+function nativeFetch(): typeof fetch {
+  if (typeof globalThis.fetch !== "function") {
+    throw new Error("A fetch implementation is required in this environment.");
+  }
+  return globalThis.fetch.bind(globalThis);
+}
+
+function nativeEventSource(url: string): EventSourceLike {
+  if (typeof globalThis.EventSource !== "function") {
+    throw new Error("An EventSource factory is required in this environment.");
+  }
+  return new globalThis.EventSource(url);
+}
+
+/**
+ * Creates the framework-free browser client. Provider credentials remain on
+ * the protocol server; injected transports may carry browser-to-server auth
+ * but that auth is never copied into public session state or component props.
+ */
+export function createRunnerClient(options: RunnerClientOptions = {}): RunnerClient {
+  const baseUrl = normalizedBaseUrl(options.baseUrl ?? "/api/phase4b");
+  const fetchImpl = options.fetchImpl ?? nativeFetch();
+  const eventSourceFactory = options.eventSourceFactory ?? nativeEventSource;
+
+  async function send<T>(path: string, init?: RequestInit): Promise<T> {
+    const headers = new Headers(init?.headers);
+    if (init?.body !== undefined && !headers.has("content-type")) {
+      headers.set("content-type", "application/json");
+    }
+    const response = await fetchImpl(`${baseUrl}${path}`, { ...init, headers });
+    const text = await response.text();
+    let body: RunnerClientErrorBody = {};
+    if (text.length > 0) {
+      try {
+        body = JSON.parse(text) as RunnerClientErrorBody;
+      } catch {
+        if (!response.ok) {
+          throw new RunnerClientError(response.status, "invalid_response", "The runner returned invalid JSON.");
+        }
+        throw new RunnerClientError(response.status, "invalid_response", "The runner returned invalid JSON.");
+      }
+    }
+    if (!response.ok) {
+      throw new RunnerClientError(
+        response.status,
+        typeof body.error === "string" ? body.error : "request_failed",
+        typeof body.message === "string" ? body.message : `Request to ${path} failed.`,
+      );
+    }
+    return body as T;
+  }
+
+  return {
+    async fetchManifests() {
+      const body = await send<{ manifests: ManifestSummary[] }>("/manifests");
+      return body.manifests;
+    },
+    createSession(input) {
+      return send<RunnerSessionState>("/sessions", {
+        method: "POST",
+        body: JSON.stringify(input),
+      });
+    },
+    readSession(sessionId) {
+      return send<RunnerSessionState>(`/sessions/${encodeURIComponent(sessionId)}`);
+    },
+    readEvents(sessionId, after = 0) {
+      return send(`/sessions/${encodeURIComponent(sessionId)}/events?after=${after}`);
+    },
+    startTurn(sessionId, text) {
+      return send<RunnerSessionState>(`/sessions/${encodeURIComponent(sessionId)}/turns`, {
+        method: "POST",
+        body: JSON.stringify({ text }),
+      });
+    },
+    steerTurn(sessionId, turnId, text) {
+      return send<RunnerSessionState>(`/sessions/${encodeURIComponent(sessionId)}/steer`, {
+        method: "POST",
+        body: JSON.stringify({ turnId, text }),
+      });
+    },
+    interruptTurn(sessionId, turnId) {
+      return send<RunnerSessionState>(`/sessions/${encodeURIComponent(sessionId)}/interrupt`, {
+        method: "POST",
+        body: JSON.stringify({ reason: "browser_operator", ...(turnId === null ? {} : { turnId }) }),
+      });
+    },
+    resolveRequest(sessionId, requestId, turnId, resolution) {
+      return send<RunnerSessionState>(
+        `/sessions/${encodeURIComponent(sessionId)}/requests/${encodeURIComponent(requestId)}/resolve`,
+        { method: "POST", body: JSON.stringify({ turnId, resolution }) },
+      );
+    },
+    goalOperation(sessionId, operation, body = {}) {
+      return send<RunnerSessionState>(
+        `/sessions/${encodeURIComponent(sessionId)}/goal/${operation}`,
+        { method: "POST", body: JSON.stringify(body) },
+      );
+    },
+    reconnectSession(sessionId) {
+      return send<RunnerSessionState>(`/sessions/${encodeURIComponent(sessionId)}/reconnect`, {
+        method: "POST",
+        body: JSON.stringify({}),
+      });
+    },
+    async closeSession(sessionId) {
+      await send(`/sessions/${encodeURIComponent(sessionId)}/close`, {
+        method: "POST",
+        body: JSON.stringify({}),
+      });
+    },
+    openEventStream(sessionId, after, handlers) {
+      const source = eventSourceFactory(
+        `${baseUrl}/sessions/${encodeURIComponent(sessionId)}/stream?after=${after}`,
+      );
+      source.onopen = () => handlers.onOpen?.();
+      source.onmessage = (message) => {
+        try {
+          handlers.onEvent(JSON.parse(message.data) as PrpEvent);
+        } catch {
+          handlers.onError?.();
+        }
+      };
+      source.onerror = () => handlers.onError?.();
+      return { close: () => source.close() };
+    },
+  };
+}
diff --git a/packages/paperclip-runner/src/browser/index.ts b/packages/paperclip-runner/src/browser/index.ts
new file mode 100644
index 00000000000..bb32aa3695b
--- /dev/null
+++ b/packages/paperclip-runner/src/browser/index.ts
@@ -0,0 +1,5 @@
+export * from "../protocol/phase1-contract.js";
+export * from "../reducer/session-reducer.js";
+export * from "./client.js";
+export * from "./protocol.js";
+export * from "./transcript-model.js";
diff --git a/packages/paperclip-runner/src/browser/protocol.ts b/packages/paperclip-runner/src/browser/protocol.ts
new file mode 100644
index 00000000000..1631665daad
--- /dev/null
+++ b/packages/paperclip-runner/src/browser/protocol.ts
@@ -0,0 +1,114 @@
+import type { PrpEvent } from "../protocol/phase1-contract.js";
+import type { SessionSnapshot } from "../reducer/session-reducer.js";
+
+/**
+ * The browser only ever sees the demo server's public state and the canonical
+ * PRP event stream. There is no second event model and no client-side session
+ * cache: every surface reads these shapes or the reducer snapshot they carry.
+ */
+export interface RunnerCapabilities {
+  resume: boolean;
+  typedEvents: boolean;
+  steering: boolean;
+  interruption: boolean;
+  structuredResult: boolean;
+  read?: boolean;
+  reconciliation?: boolean;
+  usage?: boolean;
+  runtimeRequestResolution?: boolean;
+  goals?: boolean;
+  threadLineage?: boolean;
+  unsupported?: string[];
+}
+
+export interface RunnerPendingRequest {
+  requestId: string;
+  requestKind: string;
+  method: string;
+  turnId: string;
+  itemId: string;
+  status: string;
+  prompt: string;
+  details: Record<string, unknown>;
+}
+
+export interface RunnerGoal {
+  threadId: string;
+  objective: string;
+  status: string;
+  tokenBudget: number | null;
+  tokensUsed: number;
+  timeUsedSeconds: number;
+  createdAt: number;
+  updatedAt: number;
+}
+
+export interface RunnerLineageEntry {
+  threadId: string;
+  providerSessionId: string | null;
+  parentThreadId: string | null;
+  depth: number;
+  nickname: string | null;
+  role: string | null;
+  status: string;
+}
+
+export interface RunnerSessionState {
+  sessionId: string;
+  runId: string;
+  normalizedSessionId: string;
+  manifest: string | null;
+  providerAuthentication: string;
+  credentialsExposed: boolean;
+  capabilities: RunnerCapabilities;
+  driverSession: {
+    driverSessionId: string;
+    providerSessionId?: string | null;
+    displayId?: string | null;
+  };
+  activeTurnId: string | null;
+  pendingRequests: RunnerPendingRequest[];
+  goal: RunnerGoal | null;
+  lineage: RunnerLineageEntry[];
+  cursor: number;
+  snapshot: SessionSnapshot;
+}
+
+export interface ManifestSummary {
+  id: string;
+  name: string;
+  purpose: string;
+  scenarios: string[];
+  objective: string;
+  prompt: string;
+  expectedObservations: string[];
+}
+
+export type ConnectionStatus =
+  | "idle"
+  | "connecting"
+  | "connected"
+  | "reconnecting"
+  | "disconnected"
+  | "terminal";
+
+export type GoalOperation = "get" | "set" | "pause" | "resume" | "clear";
+
+export type RunnerEventList = readonly PrpEvent[];
+
+export const GOAL_OPERATIONS: readonly GoalOperation[] = [
+  "set",
+  "get",
+  "pause",
+  "resume",
+  "clear",
+];
+
+/** Human labels for the five fixed goal verbs (interaction map §5). */
+export const GOAL_OPERATION_LABELS: Record<GoalOperation, string> = {
+  set: "Set goal…",
+  get: "View",
+  pause: "Pause",
+  resume: "Resume",
+  clear: "Clear",
+};
diff --git a/packages/paperclip-runner/src/browser/transcript-model.test.ts b/packages/paperclip-runner/src/browser/transcript-model.test.ts
new file mode 100644
index 00000000000..1025462d818
--- /dev/null
+++ b/packages/paperclip-runner/src/browser/transcript-model.test.ts
@@ -0,0 +1,309 @@
+import { describe, expect, it } from "vitest";
+
+import { Phase4bScriptedDriver } from "../mock-core/phase4b-scripted-driver";
+import {
+  parseHarnessRuntimeRequestResolution,
+  type HarnessSession,
+} from "../contracts/harness-driver";
+import type { PrpEvent } from "../protocol/phase1-contract";
+import {
+  applyPrpEvent,
+  createSessionSnapshotFromMetadata,
+  reduceSessionEvents,
+  type SessionSnapshot,
+} from "../reducer/session-reducer";
+import type { RunnerCapabilities } from "./protocol.js";
+import {
+  buildTranscript,
+  capabilityRows,
+  composerState,
+  goalAvailability,
+  runtimeRequestSubmission,
+  transcriptRole,
+  type TranscriptEntry,
+} from "./transcript-model.js";
+
+const FULL: RunnerCapabilities = {
+  resume: true,
+  typedEvents: true,
+  steering: true,
+  interruption: true,
+  structuredResult: true,
+  runtimeRequestResolution: true,
+  goals: true,
+  threadLineage: true,
+};
+
+function seed(runId: string, sessionId: string): SessionSnapshot {
+  return createSessionSnapshotFromMetadata({
+    fixtureName: "phase4b-demo",
+    identity: {
+      schema: "paperclip.prp.identity.v1",
+      companyId: "package-local-demo",
+      issueId: "phase4b-demo",
+      runId,
+      environmentLeaseId: "package-local",
+      runnerInstanceId: "phase4b-demo-server",
+      normalizedSessionId: sessionId,
+      driverSessionId: `thread-${sessionId}`,
+    },
+    capabilities: {
+      schema: "paperclip.prp.capabilities.v1",
+      sessionReusePolicy: "reuse_per_issue",
+      driver: { kind: "phase4b-demo", version: "1" },
+      steer: true,
+      interrupt: true,
+      resume: true,
+      runtimeRequests: true,
+      structuredResult: true,
+      typedEvents: true,
+    },
+  });
+}
+
+async function drive(
+  manifestId: string,
+  interact?: (session: HarnessSession, turnId: string) => Promise<void>,
+): Promise<{ events: PrpEvent[]; snapshot: SessionSnapshot }> {
+  const driver = new Phase4bScriptedDriver({ manifestId, chunkDelayMs: 0 });
+  const session = await driver.openSession({
+    runId: `run-${manifestId}`,
+    normalizedSessionId: `session-${manifestId}`,
+    workingDirectory: "/demo",
+  });
+  const events: PrpEvent[] = [];
+  const pump = (async () => {
+    for await (const event of session.events()) events.push(event);
+  })();
+  const { turnId } = await session.startTurn({ message: { role: "user", text: "Go." } });
+  if (interact !== undefined) await interact(session, turnId);
+  await new Promise<void>((resolve) => setTimeout(resolve, 60));
+  await session.close({ reason: "test" });
+  await pump;
+  return {
+    events,
+    snapshot: events.reduce(applyPrpEvent, seed(`run-${manifestId}`, `session-${manifestId}`)),
+  };
+}
+
+function kinds(entries: readonly TranscriptEntry[]): string[] {
+  return entries.map((entry) => (entry.kind === "item" ? `item:${entry.role}` : entry.kind));
+}
+
+describe("transcriptRole", () => {
+  it("maps canonical item kinds onto transcript roles", () => {
+    expect(transcriptRole("reasoning")).toBe("reasoning");
+    expect(transcriptRole("agentMessage")).toBe("assistant");
+    expect(transcriptRole("commandExecution")).toBe("tool");
+    expect(transcriptRole("fileChange")).toBe("tool");
+    expect(transcriptRole("planUpdate")).toBe("tool");
+    expect(transcriptRole("steering_acknowledgement")).toBe("steering");
+    expect(transcriptRole("thread_lineage")).toBe("lineage");
+    expect(transcriptRole("something_new")).toBe("system");
+  });
+});
+
+describe("buildTranscript", () => {
+  it("orders entries by the reducer timeline and shows the submitted message", async () => {
+    const { events, snapshot } = await drive("completion");
+    const entries = buildTranscript(snapshot, events);
+    expect(kinds(entries)).toEqual([
+      "user",
+      "item:reasoning",
+      "item:tool",
+      "item:assistant",
+      "turn",
+    ]);
+    const user = entries[0];
+    expect(user.kind === "user" && user.text).toBe("Go.");
+    const tool = entries[2];
+    expect(tool.kind === "item" && tool.input).toBe("docs/phase-04b-protocol-server.md");
+    expect(tool.kind === "item" && tool.output).toContain("server-sent events");
+  });
+
+  it("marks an interrupted item and never claims it completed cleanly", async () => {
+    const { events, snapshot } = await drive("interrupt-during-tool", async (session, turnId) => {
+      await new Promise<void>((resolve) => setTimeout(resolve, 20));
+      await session.interrupt?.({ turnId });
+    });
+    const entries = buildTranscript(snapshot, events);
+    const tool = entries.find((entry) => entry.kind === "item" && entry.role === "tool");
+    expect(tool?.kind === "item" && tool.interrupted).toBe(true);
+    expect(tool?.kind === "item" && tool.output).toBeNull();
+    const turn = entries.find((entry) => entry.kind === "turn");
+    expect(turn?.kind === "turn" && turn.state).toBe("interrupted");
+  });
+
+  it("keeps a resolved request in the record with the chosen action", async () => {
+    const { events, snapshot } = await drive("approvals", async (session, turnId) => {
+      await new Promise<void>((resolve) => setTimeout(resolve, 20));
+      await session.resolveRuntimeRequest?.({
+        requestId: "request-command",
+        turnId,
+        resolution: { action: "accept_for_session" },
+      });
+    });
+    const request = buildTranscript(snapshot, events).find(
+      (entry) => entry.kind === "request" && entry.requestId === "request-command",
+    );
+    expect(request?.kind === "request" && request.status).toBe("resolved");
+    expect(request?.kind === "request" && request.resolvedAction).toBe("accept_for_session");
+    expect(request?.kind === "request" && request.actions).toEqual([
+      "accept",
+      "accept_for_session",
+      "decline",
+      "cancel",
+    ]);
+  });
+
+  it("renders a failed item with its exact diagnostic", async () => {
+    const { events, snapshot } = await drive("failure");
+    const failed = buildTranscript(snapshot, events).find(
+      (entry) => entry.kind === "item" && entry.failure !== null,
+    );
+    expect(failed?.kind === "item" && failed.failure).toContain("cannot find module");
+  });
+
+  it("keeps a replayed prefix a real prefix of the finished transcript", async () => {
+    // Replay mode reduces events[0..n]. Stepping forward must only ever add
+    // entries in the same positions the live session produced.
+    const { events, snapshot } = await drive("completion");
+    const full = buildTranscript(snapshot, events);
+
+    for (let cut = 1; cut <= events.length; cut += 1) {
+      const prefix = events.slice(0, cut);
+      const stepped = buildTranscript(
+        prefix.reduce(applyPrpEvent, seed("run-completion", "session-completion")),
+        prefix,
+      );
+      expect(stepped.length).toBeLessThanOrEqual(full.length);
+      stepped.forEach((entry, index) => {
+        expect(entry.key).toBe(full[index]?.key);
+        expect(entry.position).toBe(full[index]?.position);
+      });
+    }
+    expect(
+      buildTranscript(
+        events.reduce(applyPrpEvent, seed("run-completion", "session-completion")),
+        events,
+      ),
+    ).toEqual(full);
+  });
+
+  it("keeps deliberate duplicate ids in reducer parity evidence", async () => {
+    const { events } = await drive("completion");
+    const duplicate = events.find((event) => event.eventType === "item.delta");
+    expect(duplicate).toBeDefined();
+    const replay = duplicate === undefined ? events : [...events, duplicate];
+    const snapshot = reduceSessionEvents(
+      seed("run-completion", "session-completion"),
+      replay,
+    );
+    expect(snapshot.duplicateEventIds).toContain(duplicate?.sourceEventId);
+    expect(snapshot.integrity).toBe("complete");
+  });
+});
+
+describe("composerState", () => {
+  const base = {
+    connection: "connected" as const,
+    submitting: false,
+    interrupting: false,
+    activeTurnId: null,
+    sessionState: "running" as const,
+  };
+
+  it("shows exactly one state per protocol situation", () => {
+    expect(composerState(base)).toBe("idle");
+    expect(composerState({ ...base, submitting: true })).toBe("submitting");
+    expect(composerState({ ...base, activeTurnId: "turn-1" })).toBe("active-turn");
+    expect(composerState({ ...base, interrupting: true, activeTurnId: "turn-1" })).toBe(
+      "interrupting",
+    );
+    expect(composerState({ ...base, connection: "disconnected" })).toBe("disconnected");
+    expect(composerState({ ...base, sessionState: "closed" })).toBe("terminal");
+  });
+
+  it("puts a terminal session ahead of every other state", () => {
+    expect(
+      composerState({
+        ...base,
+        sessionState: "failed",
+        activeTurnId: "turn-1",
+        connection: "disconnected",
+      }),
+    ).toBe("terminal");
+  });
+});
+
+describe("goalAvailability", () => {
+  it("disables every verb with the exact diagnostic when goals are unsupported", () => {
+    const rows = goalAvailability(
+      {
+        ...FULL,
+        goals: false,
+        unsupported: ["Goal operations unsupported: app-server 0.132.0 does not advertise goals"],
+      },
+      null,
+    );
+    expect(rows).toHaveLength(5);
+    expect(rows.every((row) => !row.enabled)).toBe(true);
+    expect(rows[0]?.reason).toContain("does not advertise goals");
+  });
+
+  it("disables only the verbs that are invalid for the current goal state", () => {
+    const active = goalAvailability(FULL, "active");
+    expect(active.find((row) => row.operation === "pause")?.enabled).toBe(true);
+    expect(active.find((row) => row.operation === "resume")?.enabled).toBe(false);
+
+    const paused = goalAvailability(FULL, "paused");
+    expect(paused.find((row) => row.operation === "resume")?.enabled).toBe(true);
+    expect(paused.find((row) => row.operation === "pause")?.enabled).toBe(false);
+
+    const none = goalAvailability(FULL, null);
+    expect(none.find((row) => row.operation === "set")?.enabled).toBe(true);
+    expect(none.find((row) => row.operation === "clear")?.enabled).toBe(false);
+  });
+});
+
+describe("runtimeRequestSubmission", () => {
+  it("shapes each submit body the way its request kind is validated", async () => {
+    expect(runtimeRequestSubmission("user_input", "staging")).toEqual({
+      action: "submit",
+      answers: { answer: { answers: ["staging"] } },
+    });
+    expect(runtimeRequestSubmission("elicitation", "stable")).toEqual({
+      action: "submit",
+      content: { answer: "stable" },
+    });
+
+    // The driver is the authority on shape, so both bodies are checked against
+    // the real validator rather than against this test's expectations alone.
+    for (const [requestKind, answer] of [
+      ["user_input", "staging"],
+      ["elicitation", "stable"],
+    ] as const) {
+      expect(() =>
+        parseHarnessRuntimeRequestResolution(
+          requestKind,
+          runtimeRequestSubmission(requestKind, answer),
+        )).not.toThrow();
+      // ...and the other kind's body is rejected, which is what the browser
+      // used to send for elicitation.
+      const wrongKind = requestKind === "user_input" ? "elicitation" : "user_input";
+      expect(() =>
+        parseHarnessRuntimeRequestResolution(
+          requestKind,
+          runtimeRequestSubmission(wrongKind, answer),
+        )).toThrow(/rejected its resolution/);
+    }
+  });
+});
+
+describe("capabilityRows", () => {
+  it("gives every unsupported capability a diagnostic string", () => {
+    const rows = capabilityRows({ ...FULL, goals: false, usage: false });
+    expect(rows.filter((row) => !row.supported).every((row) => row.diagnostic !== null)).toBe(true);
+    expect(rows.find((row) => row.name === "steer")?.supported).toBe(true);
+  });
+});
diff --git a/packages/paperclip-runner/src/browser/transcript-model.ts b/packages/paperclip-runner/src/browser/transcript-model.ts
new file mode 100644
index 00000000000..c8a928e7cd2
--- /dev/null
+++ b/packages/paperclip-runner/src/browser/transcript-model.ts
@@ -0,0 +1,404 @@
+import type { PrpEvent } from "../protocol/phase1-contract.js";
+import type {
+  SessionItemSnapshot,
+  SessionSnapshot,
+} from "../reducer/session-reducer.js";
+import type { GoalOperation, RunnerCapabilities } from "./protocol.js";
+
+/**
+ * A projection of reducer state plus the canonical events that produced it.
+ * It never stores anything the protocol did not send, so a replayed session
+ * and a live session with the same events project identically.
+ */
+export type TranscriptRole =
+  | "user"
+  | "assistant"
+  | "reasoning"
+  | "tool"
+  | "steering"
+  | "interrupt"
+  | "goal"
+  | "lineage"
+  | "system";
+
+export interface TranscriptItemEntry {
+  kind: "item";
+  key: string;
+  position: number;
+  role: TranscriptRole;
+  item: SessionItemSnapshot;
+  interrupted: boolean;
+  streaming: boolean;
+  toolName: string | null;
+  input: string | null;
+  output: string | null;
+  failure: string | null;
+}
+
+export interface TranscriptUserEntry {
+  kind: "user";
+  key: string;
+  position: number;
+  turnId: string | null;
+  text: string;
+}
+
+export interface TranscriptRequestEntry {
+  kind: "request";
+  key: string;
+  position: number;
+  requestId: string;
+  requestKind: string;
+  type: string;
+  prompt: string;
+  status: "pending" | "resolved" | "expired" | "cancelled";
+  actions: string[];
+  details: Record<string, unknown>;
+  resolvedAction: string | null;
+  resolvedAt: string | null;
+  turnId: string | null;
+}
+
+export interface TranscriptTurnEntry {
+  kind: "turn";
+  key: string;
+  position: number;
+  turnId: string | null;
+  state: "completed" | "failed" | "interrupted" | "cancelled";
+  detail: string;
+}
+
+export interface TranscriptDiagnosticEntry {
+  kind: "diagnostic";
+  key: string;
+  position: number;
+  message: string;
+  code: string | null;
+}
+
+export type TranscriptEntry =
+  | TranscriptItemEntry
+  | TranscriptUserEntry
+  | TranscriptRequestEntry
+  | TranscriptTurnEntry
+  | TranscriptDiagnosticEntry;
+
+const TOOL_KINDS = new Set([
+  "commandExecution",
+  "command_execution",
+  "fileChange",
+  "file_change",
+  "mcpToolCall",
+  "tool",
+  "webSearch",
+  "patchApply",
+  "plan",
+  "planUpdate",
+  "update_plan",
+]);
+
+const ASSISTANT_KINDS = new Set(["agentMessage", "assistant", "assistantMessage", "message"]);
+
+export function transcriptRole(kind: string): TranscriptRole {
+  if (kind === "reasoning") return "reasoning";
+  if (ASSISTANT_KINDS.has(kind)) return "assistant";
+  if (TOOL_KINDS.has(kind)) return "tool";
+  if (kind === "steering_acknowledgement") return "steering";
+  if (kind === "interrupt_acknowledgement") return "interrupt";
+  if (kind === "goal" || kind === "goal_cleared") return "goal";
+  if (kind === "thread_lineage") return "lineage";
+  return "system";
+}
+
+function payloadRecord(value: unknown): Record<string, unknown> {
+  return typeof value === "object" && value !== null && !Array.isArray(value)
+    ? (value as Record<string, unknown>)
+    : {};
+}
+
+function payloadText(value: unknown): string | null {
+  return typeof value === "string" && value.length > 0 ? value : null;
+}
+
+interface ItemFacts {
+  interrupted: boolean;
+  toolName: string | null;
+  input: string | null;
+  output: string | null;
+  failure: string | null;
+  terminal: boolean;
+}
+
+function collectItemFacts(events: readonly PrpEvent[]): Map<string, ItemFacts> {
+  const facts = new Map<string, ItemFacts>();
+  for (const event of events) {
+    if (event.itemId === undefined || !event.eventType.startsWith("item.")) continue;
+    const payload = payloadRecord(event.payload);
+    const current = facts.get(event.itemId) ?? {
+      interrupted: false,
+      toolName: null,
+      input: null,
+      output: null,
+      failure: null,
+      terminal: false,
+    };
+    if (payload.interrupted === true || payload.status === "interrupted") {
+      current.interrupted = true;
+    }
+    current.toolName = payloadText(payload.toolName) ?? current.toolName;
+    current.input = payloadText(payload.input) ?? current.input;
+    current.output = payloadText(payload.output) ?? current.output;
+    if (event.eventType === "item.failed") {
+      current.failure = payloadText(payload.message) ?? "The item failed.";
+    }
+    if (event.eventType === "item.completed" || event.eventType === "item.failed") {
+      current.terminal = true;
+    }
+    facts.set(event.itemId, current);
+  }
+  return facts;
+}
+
+/**
+ * Builds the submit body a request kind actually accepts. Elicitation answers
+ * travel as `content` and user-input answers as `answers`; the runner validates
+ * both against the request kind, so sending the wrong one fails closed rather
+ * than resolving the request with an empty response.
+ */
+export function runtimeRequestSubmission(
+  requestKind: string,
+  answer: string,
+): Record<string, unknown> {
+  if (requestKind === "elicitation") {
+    return { action: "submit", content: { answer } };
+  }
+  return { action: "submit", answers: { answer: { answers: [answer] } } };
+}
+
+function requestActions(details: unknown): string[] {
+  const record = payloadRecord(details);
+  return Array.isArray(record.actions)
+    ? record.actions.filter((action): action is string => typeof action === "string")
+    : [];
+}
+
+/**
+ * Builds the ordered transcript. Order comes from the reducer timeline, which
+ * is authoritative; nothing is re-sorted client-side.
+ */
+export function buildTranscript(
+  snapshot: SessionSnapshot,
+  events: readonly PrpEvent[],
+): TranscriptEntry[] {
+  const facts = collectItemFacts(events);
+  const items = new Map(snapshot.items.map((item) => [item.itemId, item]));
+  const seenItems = new Set<string>();
+  const entries: TranscriptEntry[] = [];
+  const eventsById = new Map(events.map((event) => [event.sourceEventId, event]));
+
+  for (const timelineEntry of snapshot.timeline) {
+    const event = eventsById.get(timelineEntry.sourceEventId);
+    const payload = payloadRecord(event?.payload);
+    const position = timelineEntry.position;
+
+    if (timelineEntry.eventType === "turn.submitted") {
+      entries.push({
+        kind: "user",
+        key: `user:${timelineEntry.sourceEventId}`,
+        position,
+        turnId: typeof payload.turnId === "string" ? payload.turnId : null,
+        text: payloadText(payload.text) ?? "(no message text in the canonical event)",
+      });
+      continue;
+    }
+
+    if (
+      ["turn.completed", "turn.failed", "turn.interrupted", "turn.cancelled"].includes(
+        timelineEntry.eventType,
+      )
+    ) {
+      const state = timelineEntry.eventType.split(".").at(-1) as TranscriptTurnEntry["state"];
+      entries.push({
+        kind: "turn",
+        key: `turn:${timelineEntry.sourceEventId}`,
+        position,
+        turnId: typeof payload.turnId === "string" ? payload.turnId : null,
+        state,
+        detail:
+          payloadText(payload.message) ??
+          payloadText(payload.reason) ??
+          timelineEntry.summary,
+      });
+      continue;
+    }
+
+    if (timelineEntry.eventType === "runtime_request.created") {
+      const request = payloadRecord(payload.request ?? payload);
+      const requestId = typeof request.requestId === "string" ? request.requestId : "";
+      const projected = snapshot.requests.find(
+        (candidate) => candidate.requestId === requestId,
+      );
+      const resolution = events.find(
+        (candidate) =>
+          candidate.eventType.startsWith("runtime_request.") &&
+          candidate.eventType !== "runtime_request.created" &&
+          payloadRecord(candidate.payload).requestId === requestId,
+      );
+      entries.push({
+        kind: "request",
+        key: `request:${requestId}`,
+        position,
+        requestId,
+        requestKind: typeof request.requestKind === "string" ? request.requestKind : "runtime",
+        type: typeof request.type === "string" ? request.type : "runtime",
+        prompt: payloadText(request.prompt) ?? "Runtime request",
+        status: (projected?.status ?? "pending") as TranscriptRequestEntry["status"],
+        actions: requestActions(request),
+        details: payloadRecord(request.details),
+        resolvedAction: payloadText(payloadRecord(resolution?.payload).action),
+        resolvedAt: resolution?.emittedAt ?? null,
+        turnId: typeof request.turnId === "string" ? request.turnId : null,
+      });
+      continue;
+    }
+
+    if (
+      timelineEntry.eventType === "harness.diagnostic" ||
+      timelineEntry.eventType === "runner.diagnostic"
+    ) {
+      entries.push({
+        kind: "diagnostic",
+        key: `diagnostic:${timelineEntry.sourceEventId}`,
+        position,
+        message: payloadText(payload.message) ?? timelineEntry.summary,
+        code: payloadText(payload.code),
+      });
+      continue;
+    }
+
+    const itemId = timelineEntry.itemId;
+    if (itemId === undefined || seenItems.has(itemId)) continue;
+    const item = items.get(itemId);
+    if (item === undefined) continue;
+    seenItems.add(itemId);
+    const itemFacts = facts.get(itemId);
+    entries.push({
+      kind: "item",
+      key: `item:${itemId}`,
+      position,
+      role: transcriptRole(item.kind),
+      item,
+      interrupted: itemFacts?.interrupted ?? false,
+      streaming: item.status === "running" && itemFacts?.terminal !== true,
+      toolName: itemFacts?.toolName ?? null,
+      input: itemFacts?.input ?? null,
+      output: itemFacts?.output ?? null,
+      failure: itemFacts?.failure ?? null,
+    });
+  }
+
+  return entries;
+}
+
+export type ComposerState =
+  | "idle"
+  | "submitting"
+  | "active-turn"
+  | "interrupting"
+  | "disconnected"
+  | "terminal";
+
+export interface ComposerStateInput {
+  connection: "idle" | "connecting" | "connected" | "reconnecting" | "disconnected" | "terminal";
+  submitting: boolean;
+  interrupting: boolean;
+  activeTurnId: string | null;
+  sessionState: SessionSnapshot["sessionState"];
+}
+
+/** One state machine with exactly one visible primary action. */
+export function composerState(input: ComposerStateInput): ComposerState {
+  if (input.sessionState === "closed" || input.sessionState === "failed") return "terminal";
+  if (input.connection === "disconnected" || input.connection === "reconnecting") {
+    return "disconnected";
+  }
+  if (input.interrupting) return "interrupting";
+  if (input.activeTurnId !== null) return "active-turn";
+  if (input.submitting) return "submitting";
+  return "idle";
+}
+
+export interface GoalOperationAvailability {
+  operation: GoalOperation;
+  enabled: boolean;
+  reason: string | null;
+}
+
+const GOAL_UNSUPPORTED_FALLBACK =
+  "Goal operations unsupported: this app-server does not advertise the goals capability";
+
+/**
+ * Capability gating for the goal menu. An unsupported verb is disabled with
+ * the exact upstream diagnostic — never hidden and never emulated.
+ */
+export function goalAvailability(
+  capabilities: RunnerCapabilities,
+  goalStatus: string | null,
+): GoalOperationAvailability[] {
+  const unsupported = capabilities.unsupported ?? [];
+  if (capabilities.goals !== true) {
+    const reason = unsupported[0] ?? GOAL_UNSUPPORTED_FALLBACK;
+    return (["set", "get", "pause", "resume", "clear"] as GoalOperation[]).map((operation) => ({
+      operation,
+      enabled: false,
+      reason,
+    }));
+  }
+  return (["set", "get", "pause", "resume", "clear"] as GoalOperation[]).map((operation) => {
+    if (operation === "set") return { operation, enabled: true, reason: null };
+    if (goalStatus === null) {
+      return {
+        operation,
+        enabled: false,
+        reason: "No goal is set on this thread yet.",
+      };
+    }
+    if (operation === "pause" && goalStatus !== "active") {
+      return { operation, enabled: false, reason: `The goal is already ${goalStatus}.` };
+    }
+    if (operation === "resume" && goalStatus === "active") {
+      return { operation, enabled: false, reason: "The goal is already active." };
+    }
+    return { operation, enabled: true, reason: null };
+  });
+}
+
+export interface CapabilityRow {
+  name: string;
+  supported: boolean;
+  diagnostic: string | null;
+}
+
+export function capabilityRows(capabilities: RunnerCapabilities): CapabilityRow[] {
+  const unsupported = capabilities.unsupported ?? [];
+  const rows: Array<[string, boolean | undefined]> = [
+    ["steer", capabilities.steering],
+    ["interrupt", capabilities.interruption],
+    ["resume", capabilities.resume],
+    ["runtime requests", capabilities.runtimeRequestResolution],
+    ["goals", capabilities.goals],
+    ["child threads", capabilities.threadLineage],
+    ["structured result", capabilities.structuredResult],
+    ["typed events", capabilities.typedEvents],
+    ["usage", capabilities.usage],
+  ];
+  return rows.map(([name, supported]) => ({
+    name,
+    supported: supported === true,
+    diagnostic:
+      supported === true
+        ? null
+        : (unsupported.find((entry) => entry.toLowerCase().includes(name.split(" ")[0]!)) ??
+          `${name} is not advertised by this app-server`),
+  }));
+}
diff --git a/packages/paperclip-runner/src/react/components/badge.tsx b/packages/paperclip-runner/src/react/components/badge.tsx
new file mode 100644
index 00000000000..e0434f06747
--- /dev/null
+++ b/packages/paperclip-runner/src/react/components/badge.tsx
@@ -0,0 +1,19 @@
+import * as React from "react";
+
+/** Source-adapted shadcn Badge with semantic state supplied through data-tone. */
+export function Badge({
+  className = "",
+  tone = "neutral",
+  ...props
+}: React.ComponentProps<"span"> & {
+  tone?: "neutral" | "accent" | "success" | "warning" | "danger";
+}) {
+  return (
+    <span
+      data-slot="badge"
+      data-tone={tone}
+      className={`pcr-badge ${className}`.trim()}
+      {...props}
+    />
+  );
+}
diff --git a/packages/paperclip-runner/src/react/components/banner.tsx b/packages/paperclip-runner/src/react/components/banner.tsx
new file mode 100644
index 00000000000..09d9b65438a
--- /dev/null
+++ b/packages/paperclip-runner/src/react/components/banner.tsx
@@ -0,0 +1,39 @@
+import * as React from "react";
+
+/**
+ * Source-adapted shadcn Alert. Failures stay in the transcript record, so this
+ * is only used for standing conditions (reconnect, pending request, replay).
+ */
+export function Banner({
+  className = "",
+  tone = "neutral",
+  assertive = false,
+  ...props
+}: React.ComponentProps<"div"> & {
+  tone?: "neutral" | "info" | "accent" | "success" | "warning" | "danger";
+  assertive?: boolean;
+}) {
+  return (
+    <div
+      data-slot="banner"
+      data-tone={tone}
+      {...(assertive ? { role: "alert", "aria-live": "assertive" } : {})}
+      className={`pcr-banner ${className}`.trim()}
+      {...props}
+    />
+  );
+}
+
+export function BannerText({ className = "", ...props }: React.ComponentProps<"p">) {
+  return <p data-slot="banner-text" className={`pcr-banner-text ${className}`.trim()} {...props} />;
+}
+
+export function BannerActions({ className = "", ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="banner-actions"
+      className={`pcr-banner-actions ${className}`.trim()}
+      {...props}
+    />
+  );
+}
diff --git a/packages/paperclip-runner/src/react/components/button.tsx b/packages/paperclip-runner/src/react/components/button.tsx
new file mode 100644
index 00000000000..01fffa1ecd7
--- /dev/null
+++ b/packages/paperclip-runner/src/react/components/button.tsx
@@ -0,0 +1,18 @@
+import * as React from "react";
+
+/** Source-adapted shadcn Button for the standalone, non-Tailwind devtool. */
+export function Button({
+  className = "",
+  variant = "default",
+  ...props
+}: React.ComponentProps<"button"> & {
+  variant?: "default" | "danger" | "ghost";
+}) {
+  return (
+    <button
+      data-slot="button"
+      className={`pcr-button pcr-button--${variant} ${className}`.trim()}
+      {...props}
+    />
+  );
+}
diff --git a/packages/paperclip-runner/src/react/components/card.tsx b/packages/paperclip-runner/src/react/components/card.tsx
new file mode 100644
index 00000000000..f27314e984c
--- /dev/null
+++ b/packages/paperclip-runner/src/react/components/card.tsx
@@ -0,0 +1,26 @@
+import * as React from "react";
+
+function slotClass(slot: string, className: string | undefined) {
+  return `${slot} ${className ?? ""}`.trim();
+}
+
+/** Source-adapted shadcn Card family for the standalone devtool. */
+export function Card({ className, ...props }: React.ComponentProps<"section">) {
+  return <section data-slot="card" className={slotClass("pcr-card", className)} {...props} />;
+}
+
+export function CardHeader({ className, ...props }: React.ComponentProps<"div">) {
+  return <div data-slot="card-header" className={slotClass("pcr-card-header", className)} {...props} />;
+}
+
+export function CardTitle({ className, ...props }: React.ComponentProps<"h2">) {
+  return <h2 data-slot="card-title" className={slotClass("pcr-card-title", className)} {...props} />;
+}
+
+export function CardDescription({ className, ...props }: React.ComponentProps<"p">) {
+  return <p data-slot="card-description" className={slotClass("pcr-card-description", className)} {...props} />;
+}
+
+export function CardContent({ className, ...props }: React.ComponentProps<"div">) {
+  return <div data-slot="card-content" className={slotClass("pcr-card-content", className)} {...props} />;
+}
diff --git a/packages/paperclip-runner/src/react/components/composer.tsx b/packages/paperclip-runner/src/react/components/composer.tsx
new file mode 100644
index 00000000000..0fb827d9e75
--- /dev/null
+++ b/packages/paperclip-runner/src/react/components/composer.tsx
@@ -0,0 +1,95 @@
+import * as React from "react";
+
+import type { ComposerState } from "../../browser/transcript-model.js";
+import { Button } from "./button.js";
+
+const MAX_ROWS = 8;
+const PRIMARY_LABEL: Record<ComposerState, string> = {
+  idle: "Send",
+  submitting: "Sending…",
+  "active-turn": "Steer",
+  interrupting: "Stopping…",
+  disconnected: "Send",
+  terminal: "Send",
+};
+const HINT: Record<ComposerState, string> = {
+  idle: "Enter sends. Shift and Enter add a line.",
+  submitting: "Waiting for the turn to be accepted.",
+  "active-turn": "Enter steers the running turn. Escape moves focus to Stop.",
+  interrupting: "Stopping the turn. Waiting for the terminal turn event.",
+  disconnected: "The composer is disabled until the connection is restored.",
+  terminal: "This session is closed. Replay it or reset the session state.",
+};
+
+export function Composer({
+  state,
+  value,
+  onValueChange,
+  onSubmit,
+  onStop,
+  disabledReason = null,
+  label = "Message",
+  leadingActions,
+  trailingActions,
+}: {
+  state: ComposerState;
+  value: string;
+  onValueChange: (value: string) => void;
+  onSubmit: () => void;
+  onStop: () => void;
+  disabledReason?: string | null;
+  label?: string;
+  leadingActions?: React.ReactNode;
+  trailingActions?: React.ReactNode;
+}) {
+  const textareaRef = React.useRef<HTMLTextAreaElement>(null);
+  const stopRef = React.useRef<HTMLButtonElement>(null);
+  const inputId = React.useId();
+  const hintId = React.useId();
+  const reasonId = React.useId();
+  const locked = disabledReason !== null || ["submitting", "interrupting", "disconnected", "terminal"].includes(state);
+  const canStop = state === "active-turn" || state === "submitting";
+
+  React.useEffect(() => {
+    const textarea = textareaRef.current;
+    if (textarea === null) return;
+    textarea.rows = Math.max(Math.min(value.split("\n").length, MAX_ROWS), 2);
+  }, [value]);
+
+  return (
+    <div data-slot="composer" data-state={state} className="pcr-composer">
+      <label className="pcr-visually-hidden" htmlFor={inputId}>{label}</label>
+      <textarea
+        ref={textareaRef}
+        id={inputId}
+        className="pcr-composer-input"
+        data-testid="composer-input"
+        rows={2}
+        value={value}
+        disabled={locked}
+        aria-describedby={disabledReason === null ? hintId : `${hintId} ${reasonId}`}
+        placeholder={state === "active-turn" ? "Steer the running turn…" : "Send a message…"}
+        onChange={(event) => onValueChange(event.target.value)}
+        onKeyDown={(event) => {
+          if (event.key === "Enter" && !event.shiftKey) {
+            event.preventDefault();
+            if (!locked && value.trim().length > 0) onSubmit();
+          } else if (event.key === "Escape" && canStop) {
+            event.preventDefault();
+            stopRef.current?.focus();
+          }
+        }}
+      />
+      <div className="pcr-composer-actions">
+        <div className="pcr-composer-leading">{leadingActions}</div>
+        <p id={hintId} className="pcr-composer-hint">{HINT[state]}</p>
+        {disabledReason === null ? null : <p id={reasonId} className="pcr-composer-reason">{disabledReason}</p>}
+        <div className="pcr-composer-buttons">
+          <Button ref={stopRef} type="button" variant="danger" data-testid="composer-stop" disabled={!canStop} onClick={onStop}>Stop</Button>
+          <Button type="button" data-testid="composer-send" disabled={locked || value.trim().length === 0} onClick={onSubmit}>{PRIMARY_LABEL[state]}</Button>
+          {trailingActions}
+        </div>
+      </div>
+    </div>
+  );
+}
diff --git a/packages/paperclip-runner/src/react/components/conversation.tsx b/packages/paperclip-runner/src/react/components/conversation.tsx
new file mode 100644
index 00000000000..f46706cee57
--- /dev/null
+++ b/packages/paperclip-runner/src/react/components/conversation.tsx
@@ -0,0 +1,178 @@
+import * as React from "react";
+
+import type { SessionItemSnapshot } from "../../reducer/session-reducer.js";
+import type {
+  TranscriptEntry,
+  TranscriptRequestEntry,
+} from "../../browser/transcript-model.js";
+import { RequestCard } from "../request-card.js";
+import { Badge } from "./badge.js";
+import { Message } from "./message.js";
+import { ReasoningItem } from "./reasoning-item.js";
+import { ToolItem, type ToolStatus } from "./tool-item.js";
+
+const TURN_TONE = {
+  completed: "success",
+  failed: "danger",
+  interrupted: "warning",
+  cancelled: "warning",
+} as const;
+const TURN_LABEL = {
+  completed: "Turn completed",
+  failed: "Turn failed",
+  interrupted: "Turn interrupted",
+  cancelled: "Cancelled before start",
+} as const;
+
+function toolStatus(entry: Extract<TranscriptEntry, { kind: "item" }>): ToolStatus {
+  if (entry.interrupted) return "interrupted";
+  if (entry.item.status === "failed") return "failed";
+  if (entry.item.status === "running") return "running";
+  return "completed";
+}
+
+export interface ConversationProps {
+  entries: readonly TranscriptEntry[];
+  label?: string;
+  unseenCount?: number;
+  highlightItemId?: string | null;
+  onResolveRequest?: (
+    request: TranscriptRequestEntry,
+    resolution: Record<string, unknown>,
+  ) => void;
+  renderItemBody?: (item: SessionItemSnapshot) => React.ReactNode;
+  renderRequestDetail?: (request: TranscriptRequestEntry) => React.ReactNode;
+}
+
+/**
+ * Canonical transcript renderer. Ordering comes from reducer-backed entries;
+ * the component owns only scroll following and the accepted render seams.
+ */
+export function Conversation({
+  entries,
+  label = "Session transcript",
+  unseenCount,
+  highlightItemId = null,
+  onResolveRequest,
+  renderItemBody,
+  renderRequestDetail,
+}: ConversationProps) {
+  const viewportRef = React.useRef<HTMLDivElement>(null);
+  const [following, setFollowing] = React.useState(true);
+  const [seenCount, setSeenCount] = React.useState(entries.length);
+
+  const scrollToBottom = React.useCallback((smooth: boolean) => {
+    const viewport = viewportRef.current;
+    if (viewport === null) return;
+    const reduceMotion = window.matchMedia?.("(prefers-reduced-motion: reduce)").matches === true;
+    viewport.scrollTo({
+      top: viewport.scrollHeight,
+      behavior: smooth && !reduceMotion ? "smooth" : "auto",
+    });
+  }, []);
+
+  React.useEffect(() => {
+    if (!following) return;
+    scrollToBottom(true);
+    setSeenCount(entries.length);
+  }, [entries.length, following, scrollToBottom]);
+
+  function reengage() {
+    setFollowing(true);
+    setSeenCount(entries.length);
+    scrollToBottom(true);
+  }
+
+  const unseen = unseenCount ?? Math.max(entries.length - seenCount, 0);
+
+  return (
+    <div data-slot="conversation" className="pcr-conversation">
+      <div
+        ref={viewportRef}
+        role="log"
+        aria-label={label}
+        aria-relevant="additions"
+        tabIndex={0}
+        className="pcr-conversation-viewport"
+        data-following={following}
+        data-testid="runner-transcript"
+        onScroll={() => {
+          const viewport = viewportRef.current;
+          if (viewport === null) return;
+          const atBottom = viewport.scrollHeight - viewport.scrollTop - viewport.clientHeight < 24;
+          setFollowing(atBottom);
+          if (atBottom) setSeenCount(entries.length);
+        }}
+        onKeyDown={(event) => {
+          if (event.key === "End") {
+            event.preventDefault();
+            reengage();
+          } else if (event.key === "Home") {
+            event.preventDefault();
+            setFollowing(false);
+            viewportRef.current?.scrollTo({ top: 0 });
+          }
+        }}
+      >
+        {entries.length === 0 ? (
+          <div className="pcr-empty-transcript" data-testid="empty-transcript">
+            <p className="pcr-eyebrow">No session yet</p>
+            <h3>Pick a demo chat or send a message</h3>
+            <p>The browser holds no provider credential. The protocol server owns the driver and working directory.</p>
+          </div>
+        ) : null}
+        <ol className="pcr-transcript" role="list">
+          {entries.map((entry) => {
+            if (entry.kind === "user") {
+              return <li key={entry.key}><Message role="user" text={entry.text} /></li>;
+            }
+            if (entry.kind === "turn") {
+              return (
+                <li key={entry.key} className="pcr-turn-marker" data-testid={`turn-${entry.state}`}>
+                  <Badge tone={TURN_TONE[entry.state]}>{TURN_LABEL[entry.state]}</Badge><span>{entry.detail}</span>
+                </li>
+              );
+            }
+            if (entry.kind === "diagnostic") {
+              return <li key={entry.key}><Message role="system" text={entry.message} failed /></li>;
+            }
+            if (entry.kind === "request") {
+              return (
+                <RequestCard
+                  key={entry.key}
+                  request={entry}
+                  onResolve={(resolution) => onResolveRequest?.(entry, resolution)}
+                  {...(renderRequestDetail === undefined ? {} : { renderRequestDetail })}
+                />
+              );
+            }
+            if (entry.role === "reasoning") {
+              return (
+                <li key={entry.key} data-highlighted={entry.item.itemId === highlightItemId}>
+                  <ReasoningItem item={entry.item} streaming={entry.streaming} interrupted={entry.interrupted} {...(renderItemBody === undefined ? {} : { renderItemBody })} />
+                </li>
+              );
+            }
+            if (entry.role === "tool") {
+              return (
+                <li key={entry.key} data-highlighted={entry.item.itemId === highlightItemId}>
+                  <ToolItem item={entry.item} name={entry.toolName ?? entry.item.kind} status={toolStatus(entry)} input={entry.input} output={entry.output} failure={entry.failure} {...(renderItemBody === undefined ? {} : { renderItemBody })} />
+                </li>
+              );
+            }
+            return (
+              <li key={entry.key} data-highlighted={entry.item.itemId === highlightItemId}>
+                <Message role={entry.role} item={entry.item} streaming={entry.streaming} interrupted={entry.interrupted} failed={entry.item.status === "failed"} failure={entry.failure} {...(renderItemBody === undefined ? {} : { renderItemBody })} />
+              </li>
+            );
+          })}
+        </ol>
+      </div>
+      {following ? null : (
+        <button type="button" className="pcr-jump-to-latest" data-testid="jump-to-latest" onClick={reengage}>
+          Jump to latest{unseen > 0 ? ` (${unseen} new)` : ""}
+        </button>
+      )}
+    </div>
+  );
+}
diff --git a/packages/paperclip-runner/src/react/components/dialog.tsx b/packages/paperclip-runner/src/react/components/dialog.tsx
new file mode 100644
index 00000000000..6d78e8a5004
--- /dev/null
+++ b/packages/paperclip-runner/src/react/components/dialog.tsx
@@ -0,0 +1,68 @@
+import * as React from "react";
+
+/**
+ * Source-adapted shadcn Dialog rebuilt on the native `<dialog>` element.
+ * `showModal()` supplies the focus trap, the backdrop, and Escape-to-close,
+ * so no radix runtime and no focus-trap dependency are needed.
+ */
+export function Dialog({
+  open,
+  onClose,
+  title,
+  description,
+  children,
+  footer,
+}: {
+  open: boolean;
+  onClose: () => void;
+  title: string;
+  description?: string;
+  children?: React.ReactNode;
+  footer: React.ReactNode;
+}) {
+  const ref = React.useRef<HTMLDialogElement>(null);
+  const invokingControlRef = React.useRef<HTMLElement | null>(null);
+  const titleId = React.useId();
+  const descriptionId = React.useId();
+
+  React.useEffect(() => {
+    const element = ref.current;
+    if (element === null) return;
+    if (open && !element.open) {
+      invokingControlRef.current = document.activeElement as HTMLElement | null;
+      element.showModal();
+    }
+    if (!open && element.open) element.close();
+  }, [open]);
+
+  return (
+    <dialog
+      ref={ref}
+      data-slot="dialog"
+      className="pcr-dialog"
+      aria-labelledby={titleId}
+      {...(description === undefined ? {} : { "aria-describedby": descriptionId })}
+      onCancel={(event) => {
+        event.preventDefault();
+        onClose();
+      }}
+      onClose={() => {
+        onClose();
+        invokingControlRef.current?.focus();
+      }}
+    >
+      <form method="dialog" className="pcr-dialog-body">
+        <h2 id={titleId} className="pcr-dialog-title">
+          {title}
+        </h2>
+        {description === undefined ? null : (
+          <p id={descriptionId} className="pcr-dialog-description">
+            {description}
+          </p>
+        )}
+        {children}
+        <div className="pcr-dialog-footer">{footer}</div>
+      </form>
+    </dialog>
+  );
+}
diff --git a/packages/paperclip-runner/src/react/components/menu.tsx b/packages/paperclip-runner/src/react/components/menu.tsx
new file mode 100644
index 00000000000..113ed67e2d7
--- /dev/null
+++ b/packages/paperclip-runner/src/react/components/menu.tsx
@@ -0,0 +1,146 @@
+import * as React from "react";
+
+export interface MenuItemDefinition {
+  id: string;
+  label: string;
+  enabled: boolean;
+  /** Exact upstream diagnostic; exposed through aria-describedby, not hover. */
+  reason: string | null;
+}
+
+/**
+ * Source-adapted shadcn DropdownMenu narrowed to the menu-button pattern the
+ * goal surface needs. Five fixed verbs, no search, no radix portal.
+ */
+export function Menu({
+  label,
+  items,
+  onSelect,
+  disabled = false,
+  disabledReason = null,
+  triggerId,
+}: {
+  label: string;
+  items: readonly MenuItemDefinition[];
+  onSelect: (id: string) => void;
+  disabled?: boolean;
+  disabledReason?: string | null;
+  triggerId: string;
+}) {
+  const [open, setOpen] = React.useState(false);
+  const containerRef = React.useRef<HTMLDivElement>(null);
+  const triggerRef = React.useRef<HTMLButtonElement>(null);
+  const descriptionId = `${triggerId}-reason`;
+
+  React.useEffect(() => {
+    if (!open) return undefined;
+    function onPointerDown(event: MouseEvent) {
+      if (!containerRef.current?.contains(event.target as Node)) setOpen(false);
+    }
+    document.addEventListener("mousedown", onPointerDown);
+    return () => document.removeEventListener("mousedown", onPointerDown);
+  }, [open]);
+
+  function focusItem(index: number) {
+    const buttons = containerRef.current?.querySelectorAll<HTMLButtonElement>(
+      '[role="menuitem"]',
+    );
+    if (buttons === undefined || buttons.length === 0) return;
+    buttons[(index + buttons.length) % buttons.length]?.focus();
+  }
+
+  function onTriggerKeyDown(event: React.KeyboardEvent<HTMLButtonElement>) {
+    if (["ArrowDown", "Enter", " "].includes(event.key)) {
+      event.preventDefault();
+      setOpen(true);
+      window.setTimeout(() => focusItem(0), 0);
+    }
+  }
+
+  function onMenuKeyDown(event: React.KeyboardEvent<HTMLDivElement>) {
+    const buttons = [
+      ...(containerRef.current?.querySelectorAll<HTMLButtonElement>('[role="menuitem"]') ?? []),
+    ];
+    const index = buttons.indexOf(document.activeElement as HTMLButtonElement);
+    if (event.key === "Escape") {
+      event.preventDefault();
+      setOpen(false);
+      triggerRef.current?.focus();
+    } else if (event.key === "ArrowDown") {
+      event.preventDefault();
+      focusItem(index + 1);
+    } else if (event.key === "ArrowUp") {
+      event.preventDefault();
+      focusItem(index - 1);
+    } else if (event.key === "Home") {
+      event.preventDefault();
+      focusItem(0);
+    } else if (event.key === "End") {
+      event.preventDefault();
+      focusItem(buttons.length - 1);
+    } else if (event.key === "Tab") {
+      setOpen(false);
+    }
+  }
+
+  return (
+    <div ref={containerRef} data-slot="menu" className="pcr-menu">
+      <button
+        ref={triggerRef}
+        id={triggerId}
+        type="button"
+        className="pcr-button pcr-button--quiet"
+        aria-haspopup="menu"
+        aria-expanded={open}
+        aria-disabled={disabled}
+        {...(disabled && disabledReason !== null ? { "aria-describedby": descriptionId } : {})}
+        onClick={() => {
+          if (disabled) return;
+          setOpen((current) => !current);
+        }}
+        onKeyDown={(event) => {
+          if (disabled) return;
+          onTriggerKeyDown(event);
+        }}
+      >
+        {label}
+        <span aria-hidden="true"> ▾</span>
+      </button>
+      {disabled && disabledReason !== null ? (
+        <p id={descriptionId} className="pcr-menu-reason">
+          {disabledReason}
+        </p>
+      ) : null}
+      {open && !disabled ? (
+        <div role="menu" aria-labelledby={triggerId} className="pcr-menu-list" onKeyDown={onMenuKeyDown}>
+          {items.map((item) => {
+            const itemReasonId = `${triggerId}-${item.id}-reason`;
+            return (
+              <React.Fragment key={item.id}>
+                <button
+                  type="button"
+                  role="menuitem"
+                  className="pcr-menu-item"
+                  aria-disabled={!item.enabled}
+                  {...(item.reason === null ? {} : { "aria-describedby": itemReasonId })}
+                  onClick={() => {
+                    if (!item.enabled) return;
+                    setOpen(false);
+                    onSelect(item.id);
+                  }}
+                >
+                  {item.label}
+                </button>
+                {item.reason === null ? null : (
+                  <p id={itemReasonId} className="pcr-menu-reason">
+                    {item.reason}
+                  </p>
+                )}
+              </React.Fragment>
+            );
+          })}
+        </div>
+      ) : null}
+    </div>
+  );
+}
diff --git a/packages/paperclip-runner/src/react/components/message.tsx b/packages/paperclip-runner/src/react/components/message.tsx
new file mode 100644
index 00000000000..c4fb5c33589
--- /dev/null
+++ b/packages/paperclip-runner/src/react/components/message.tsx
@@ -0,0 +1,74 @@
+import * as React from "react";
+
+import type { SessionItemSnapshot } from "../../reducer/session-reducer.js";
+import type { TranscriptRole } from "../../browser/transcript-model.js";
+
+const ROLE_LABELS: Record<TranscriptRole, string> = {
+  user: "You",
+  assistant: "Assistant",
+  reasoning: "Reasoning",
+  tool: "Tool",
+  steering: "Steering acknowledged",
+  interrupt: "Interrupt acknowledged",
+  goal: "Goal",
+  lineage: "Child thread",
+  system: "System",
+};
+
+export interface MessageProps {
+  role: TranscriptRole;
+  item?: SessionItemSnapshot;
+  text?: string;
+  interrupted?: boolean;
+  failed?: boolean;
+  failure?: string | null;
+  streaming?: boolean;
+  renderItemBody?: (item: SessionItemSnapshot) => React.ReactNode;
+  children?: React.ReactNode;
+}
+
+export function Message({
+  role,
+  item,
+  text,
+  interrupted = false,
+  failed = false,
+  failure = null,
+  streaming = false,
+  renderItemBody,
+  children,
+}: MessageProps) {
+  const body = item === undefined
+    ? (children ?? text ?? "")
+    : (renderItemBody?.(item) ?? <MessageText text={item.text} streaming={streaming} />);
+  return (
+    <article
+      data-slot="message"
+      data-role={role}
+      data-state={failed ? "failed" : interrupted ? "interrupted" : streaming ? "streaming" : "settled"}
+      className="pcr-message"
+    >
+      <p className="pcr-message-role">{ROLE_LABELS[role]}</p>
+      <div className="pcr-message-body">{body}</div>
+      {failure === null ? null : (
+        <pre className="pcr-payload pcr-payload--danger" data-testid="item-failure">
+          {failure}
+        </pre>
+      )}
+      {interrupted ? (
+        <p className="pcr-message-divider" data-testid="interrupted-divider">
+          Interrupted — the text above is everything that arrived.
+        </p>
+      ) : null}
+    </article>
+  );
+}
+
+export function MessageText({ text, streaming }: { text: string; streaming: boolean }) {
+  return (
+    <p className="pcr-message-text">
+      {text}
+      {streaming ? <span className="pcr-stream-cursor" aria-hidden="true" /> : null}
+    </p>
+  );
+}
diff --git a/packages/paperclip-runner/src/react/components/reasoning-item.tsx b/packages/paperclip-runner/src/react/components/reasoning-item.tsx
new file mode 100644
index 00000000000..56545e865da
--- /dev/null
+++ b/packages/paperclip-runner/src/react/components/reasoning-item.tsx
@@ -0,0 +1,32 @@
+import * as React from "react";
+
+import type { SessionItemSnapshot } from "../../reducer/session-reducer.js";
+
+export function ReasoningItem({
+  item,
+  streaming,
+  interrupted,
+  renderItemBody,
+}: {
+  item: SessionItemSnapshot;
+  streaming: boolean;
+  interrupted: boolean;
+  renderItemBody?: (item: SessionItemSnapshot) => React.ReactNode;
+}) {
+  const summary = item.text.split("\n")[0]?.slice(0, 96) ?? "Reasoning";
+  return (
+    <details
+      data-slot="reasoning-item"
+      className="pcr-disclosure"
+      open={streaming}
+      data-testid="reasoning-item"
+    >
+      <summary className="pcr-disclosure-summary">
+        <span>{streaming ? "Reasoning…" : "Reasoning"}</span>
+        <span className="pcr-disclosure-preview">{summary}</span>
+      </summary>
+      {renderItemBody?.(item) ?? <pre className="pcr-payload">{item.text}</pre>}
+      {interrupted ? <p className="pcr-message-divider">Interrupted while reasoning.</p> : null}
+    </details>
+  );
+}
diff --git a/packages/paperclip-runner/src/react/components/tabs.tsx b/packages/paperclip-runner/src/react/components/tabs.tsx
new file mode 100644
index 00000000000..1670b893ea6
--- /dev/null
+++ b/packages/paperclip-runner/src/react/components/tabs.tsx
@@ -0,0 +1,94 @@
+import * as React from "react";
+
+export interface TabDefinition {
+  id: string;
+  label: string;
+}
+
+/**
+ * Source-adapted shadcn Tabs rebuilt on the WAI-ARIA tabs pattern with a
+ * roving tabindex. No radix runtime: arrow keys move, Home/End jump, Tab
+ * enters the panel.
+ */
+export function Tabs({
+  items,
+  selected,
+  onSelect,
+  label,
+  className = "",
+  children,
+}: {
+  items: readonly TabDefinition[];
+  selected: string;
+  onSelect: (value: string) => void;
+  label: string;
+  className?: string;
+  children: React.ReactNode;
+}) {
+  const listRef = React.useRef<HTMLDivElement>(null);
+  const idPrefix = React.useId();
+
+  function moveFocus(nextIndex: number) {
+    const normalizedIndex = (nextIndex + items.length) % items.length;
+    const next = items[normalizedIndex];
+    if (next === undefined) return;
+    onSelect(next.id);
+    const button = listRef.current?.querySelectorAll<HTMLButtonElement>('[role="tab"]')[normalizedIndex];
+    button?.focus();
+  }
+
+  function onKeyDown(event: React.KeyboardEvent<HTMLDivElement>) {
+    const index = items.findIndex((tab) => tab.id === selected);
+    if (event.key === "ArrowRight") {
+      event.preventDefault();
+      moveFocus(index + 1);
+    } else if (event.key === "ArrowLeft") {
+      event.preventDefault();
+      moveFocus(index - 1);
+    } else if (event.key === "Home") {
+      event.preventDefault();
+      moveFocus(0);
+    } else if (event.key === "End") {
+      event.preventDefault();
+      moveFocus(items.length - 1);
+    }
+  }
+
+  return (
+    <div data-slot="tabs" className={`pcr-tabs ${className}`.trim()}>
+      <div
+        ref={listRef}
+        role="tablist"
+        aria-label={label}
+        className="pcr-tablist"
+        onKeyDown={onKeyDown}
+      >
+        {items.map((tab) => (
+          <button
+            key={tab.id}
+            type="button"
+            role="tab"
+            data-tab-id={tab.id}
+            id={`${idPrefix}-tab-${tab.id}`}
+            aria-selected={tab.id === selected}
+            aria-controls={`${idPrefix}-tabpanel-${tab.id}`}
+            tabIndex={tab.id === selected ? 0 : -1}
+            className="pcr-tab"
+            onClick={() => onSelect(tab.id)}
+          >
+            {tab.label}
+          </button>
+        ))}
+      </div>
+      <div
+        role="tabpanel"
+        id={`${idPrefix}-tabpanel-${selected}`}
+        aria-labelledby={`${idPrefix}-tab-${selected}`}
+        tabIndex={0}
+        className="pcr-tabpanel"
+      >
+        {children}
+      </div>
+    </div>
+  );
+}
diff --git a/packages/paperclip-runner/src/react/components/textarea.tsx b/packages/paperclip-runner/src/react/components/textarea.tsx
new file mode 100644
index 00000000000..47c538e3f22
--- /dev/null
+++ b/packages/paperclip-runner/src/react/components/textarea.tsx
@@ -0,0 +1,15 @@
+import * as React from "react";
+
+/** Source-adapted shadcn Textarea for editable fixture JSON. */
+export function Textarea({
+  className = "",
+  ...props
+}: React.ComponentProps<"textarea">) {
+  return (
+    <textarea
+      data-slot="textarea"
+      className={`pcr-textarea ${className}`.trim()}
+      {...props}
+    />
+  );
+}
diff --git a/packages/paperclip-runner/src/react/components/tool-item.tsx b/packages/paperclip-runner/src/react/components/tool-item.tsx
new file mode 100644
index 00000000000..38329dac73c
--- /dev/null
+++ b/packages/paperclip-runner/src/react/components/tool-item.tsx
@@ -0,0 +1,83 @@
+import * as React from "react";
+
+import type { SessionItemSnapshot } from "../../reducer/session-reducer.js";
+import { Badge } from "./badge.js";
+
+export type ToolStatus = "running" | "completed" | "failed" | "interrupted";
+
+const STATUS_TONE: Record<ToolStatus, "accent" | "success" | "danger" | "warning"> = {
+  running: "accent",
+  completed: "success",
+  failed: "danger",
+  interrupted: "warning",
+};
+
+const STATUS_LABEL: Record<ToolStatus, string> = {
+  running: "Running",
+  completed: "Completed",
+  failed: "Failed",
+  interrupted: "Interrupted",
+};
+
+function toolView(kind: string): string {
+  if (["commandExecution", "command_execution"].includes(kind)) return "Terminal";
+  if (["fileChange", "file_change", "patchApply"].includes(kind)) return "File change";
+  if (["plan", "planUpdate", "update_plan"].includes(kind)) return "Plan";
+  return "Tool";
+}
+
+export function ToolItem({
+  item,
+  name,
+  status,
+  input,
+  output,
+  failure,
+  renderItemBody,
+}: {
+  item: SessionItemSnapshot;
+  name: string;
+  status: ToolStatus;
+  input: string | null;
+  output: string | null;
+  failure: string | null;
+  renderItemBody?: (item: SessionItemSnapshot) => React.ReactNode;
+}) {
+  const view = toolView(item.kind);
+  return (
+    <details
+      data-slot="tool-item"
+      className="pcr-disclosure"
+      open={status === "running" || status === "failed"}
+      data-testid="tool-item"
+      data-status={status}
+      data-view={view.toLowerCase().replaceAll(" ", "-")}
+    >
+      <summary className="pcr-disclosure-summary">
+        <span>{view} <code>{name}</code></span>
+        <Badge tone={STATUS_TONE[status]}>{STATUS_LABEL[status]}</Badge>
+      </summary>
+      {renderItemBody?.(item) ?? (
+        <>
+          {input === null ? null : (
+            <><p className="pcr-disclosure-label">Input</p><pre className="pcr-payload">{input}</pre></>
+          )}
+          {output === null ? null : (
+            <><p className="pcr-disclosure-label">Output</p><pre className="pcr-payload">{output}</pre></>
+          )}
+          {input === null && output === null && item.text.length > 0
+            ? <pre className="pcr-payload">{item.text}</pre>
+            : null}
+        </>
+      )}
+      {failure === null ? null : (
+        <><p className="pcr-disclosure-label">Diagnostic</p><pre className="pcr-payload pcr-payload--danger" data-testid="tool-failure">{failure}</pre></>
+      )}
+      {status === "interrupted" ? (
+        <p className="pcr-message-divider" data-testid="interrupted-divider">
+          Interrupted — the last known status is shown and no result was fabricated.
+        </p>
+      ) : null}
+    </details>
+  );
+}
diff --git a/packages/paperclip-runner/src/react/components/tooltip.tsx b/packages/paperclip-runner/src/react/components/tooltip.tsx
new file mode 100644
index 00000000000..6ecf5dabba0
--- /dev/null
+++ b/packages/paperclip-runner/src/react/components/tooltip.tsx
@@ -0,0 +1,25 @@
+import * as React from "react";
+
+/**
+ * Source-adapted shadcn Tooltip. The content is always mirrored into a
+ * described-by element, so a tooltip is never the only channel for a
+ * diagnostic (interaction map A5).
+ */
+export function Tooltip({
+  content,
+  id,
+  children,
+}: {
+  content: string;
+  id: string;
+  children: React.ReactElement<{ "aria-describedby"?: string }>;
+}) {
+  return (
+    <span data-slot="tooltip" className="pcr-tooltip">
+      {React.cloneElement(children, { "aria-describedby": id })}
+      <span role="tooltip" id={id} className="pcr-tooltip-content">
+        {content}
+      </span>
+    </span>
+  );
+}
diff --git a/packages/paperclip-runner/src/react/connection-banner.tsx b/packages/paperclip-runner/src/react/connection-banner.tsx
new file mode 100644
index 00000000000..645d8a50b0b
--- /dev/null
+++ b/packages/paperclip-runner/src/react/connection-banner.tsx
@@ -0,0 +1,39 @@
+import * as React from "react";
+
+import type { ConnectionStatus } from "../browser/protocol.js";
+import { Banner, BannerActions, BannerText } from "./components/banner.js";
+import { Button } from "./components/button.js";
+
+export function ConnectionBanner({
+  connection,
+  reconnectAttempt,
+  onRetry,
+}: {
+  connection: ConnectionStatus;
+  reconnectAttempt: number;
+  onRetry: () => void;
+}) {
+  const ref = React.useRef<HTMLDivElement>(null);
+  const blocking = connection === "disconnected";
+  React.useEffect(() => {
+    if (blocking) ref.current?.focus();
+  }, [blocking]);
+  if (connection !== "disconnected" && connection !== "reconnecting") return null;
+  return (
+    <Banner
+      ref={ref}
+      data-slot="connection-banner"
+      tone="warning"
+      assertive={blocking}
+      tabIndex={blocking ? -1 : undefined}
+      data-testid="reconnect-banner"
+    >
+      <BannerText>
+        {connection === "reconnecting"
+          ? `Connection lost — reconnecting (attempt ${reconnectAttempt})…`
+          : "Connection lost — the session is still on the server."}
+      </BannerText>
+      <BannerActions><Button type="button" onClick={onRetry}>Retry now</Button></BannerActions>
+    </Banner>
+  );
+}
diff --git a/packages/paperclip-runner/src/react/index.ts b/packages/paperclip-runner/src/react/index.ts
new file mode 100644
index 00000000000..5fb539f1266
--- /dev/null
+++ b/packages/paperclip-runner/src/react/index.ts
@@ -0,0 +1,32 @@
+export { Badge } from "./components/badge.js";
+export { Banner, BannerActions, BannerText } from "./components/banner.js";
+export { Button } from "./components/button.js";
+export {
+  Card,
+  CardContent,
+  CardDescription,
+  CardHeader,
+  CardTitle,
+} from "./components/card.js";
+export { Composer } from "./components/composer.js";
+export { Conversation, type ConversationProps } from "./components/conversation.js";
+export { Dialog } from "./components/dialog.js";
+export { Menu, type MenuItemDefinition } from "./components/menu.js";
+export { Message, type MessageProps } from "./components/message.js";
+export { ReasoningItem } from "./components/reasoning-item.js";
+export { Tabs, type TabDefinition } from "./components/tabs.js";
+export { Textarea } from "./components/textarea.js";
+export { ToolItem, type ToolStatus } from "./components/tool-item.js";
+export { Tooltip } from "./components/tooltip.js";
+export { ConnectionBanner } from "./connection-banner.js";
+export { Inspector } from "./inspector.js";
+export { ReplayControls } from "./replay-controls.js";
+export { RequestCard } from "./request-card.js";
+export { RunnerConsoleApp, type RunnerConsoleAppProps } from "./runner-console-app.js";
+export { SessionTimeline } from "./session-timeline.js";
+export {
+  useRunnerConsole,
+  type RunnerConsole,
+  type SteeringChip,
+  type SteeringChipStatus,
+} from "./use-runner-console.js";
diff --git a/packages/paperclip-runner/src/react/inspector.tsx b/packages/paperclip-runner/src/react/inspector.tsx
new file mode 100644
index 00000000000..d638479ea87
--- /dev/null
+++ b/packages/paperclip-runner/src/react/inspector.tsx
@@ -0,0 +1,232 @@
+import * as React from "react";
+
+import type { PrpEvent } from "../protocol/phase1-contract.js";
+import type { SessionSnapshot } from "../reducer/session-reducer.js";
+import { Badge } from "./components/badge.js";
+import { Tabs } from "./components/tabs.js";
+import type { ConnectionStatus, RunnerSessionState } from "../browser/protocol.js";
+import { capabilityRows } from "../browser/transcript-model.js";
+
+const TABS = [
+  { id: "events", label: "Events" },
+  { id: "requests", label: "Requests" },
+  { id: "capabilities", label: "Capabilities" },
+  { id: "session", label: "Session" },
+];
+
+function CopyButton({ label, value }: { label: string; value: string }) {
+  const [copied, setCopied] = React.useState(false);
+  return (
+    <button
+      type="button"
+      className="pcr-copy"
+      aria-label={label}
+      onClick={() => {
+        void navigator.clipboard?.writeText(value).then(
+          () => setCopied(true),
+          () => setCopied(false),
+        );
+      }}
+    >
+      {copied ? "Copied" : "Copy"}
+    </button>
+  );
+}
+
+/**
+ * The debugging surface. Redaction is the server's job: the inspector renders
+ * redaction markers verbatim and never tries to reconstruct a redacted value.
+ */
+export function Inspector({
+  events,
+  snapshot,
+  state,
+  connection,
+  reconnectAttempt,
+  replayParity,
+  highlightItemId,
+  onHighlightItem,
+}: {
+  events: readonly PrpEvent[];
+  snapshot: SessionSnapshot | null;
+  state: RunnerSessionState | null;
+  connection: ConnectionStatus;
+  reconnectAttempt: number;
+  replayParity: boolean | null;
+  highlightItemId: string | null;
+  onHighlightItem: (itemId: string | null) => void;
+}) {
+  const [tab, setTab] = React.useState("events");
+  const [filter, setFilter] = React.useState("");
+  const [facet, setFacet] = React.useState<string | null>(null);
+  const filterId = React.useId();
+
+  const facets = React.useMemo(
+    () => [...new Set(events.map((event) => event.eventType))].sort(),
+    [events],
+  );
+
+  const visible = React.useMemo(
+    () =>
+      events.filter((event) => {
+        if (facet !== null && event.eventType !== facet) return false;
+        if (filter.length === 0) return true;
+        return JSON.stringify(event).toLowerCase().includes(filter.toLowerCase());
+      }),
+    [events, facet, filter],
+  );
+
+  return (
+    <section data-slot="inspector" className="pcr-inspector">
+      <Tabs items={TABS} selected={tab} onSelect={setTab} label="Protocol inspector">
+        {tab === "events" ? (
+          <div className="pcr-inspector-events">
+          <label className="pcr-visually-hidden" htmlFor={filterId}>
+            Filter events
+          </label>
+          <input
+            id={filterId}
+            className="pcr-inspector-filter"
+            data-testid="inspector-filter"
+            placeholder="Filter events"
+            value={filter}
+            onChange={(event) => setFilter(event.target.value)}
+          />
+          <div className="pcr-facets">
+            <button
+              type="button"
+              className="pcr-facet"
+              aria-pressed={facet === null}
+              onClick={() => setFacet(null)}
+            >
+              All
+            </button>
+            {facets.map((candidate) => (
+              <button
+                key={candidate}
+                type="button"
+                className="pcr-facet"
+                aria-pressed={facet === candidate}
+                onClick={() => setFacet(candidate)}
+              >
+                {candidate}
+              </button>
+            ))}
+          </div>
+          <ol className="pcr-inspector-list" data-testid="inspector-events">
+            {visible.map((event, index) => (
+              <li
+                key={`${event.sourceEventId}:${index}`}
+                data-highlighted={
+                  highlightItemId !== null && event.itemId === highlightItemId
+                }
+              >
+                <details
+                  onToggle={(toggle) =>
+                    onHighlightItem(
+                      (toggle.currentTarget as HTMLDetailsElement).open
+                        ? (event.itemId ?? null)
+                        : null,
+                    )
+                  }
+                >
+                  <summary className="pcr-inspector-row">
+                    <code className="pcr-seq">{event.sourceSeq}</code>
+                    <code>{event.eventType}</code>
+                    <code className="pcr-inspector-id">{event.itemId ?? event.turnId ?? "—"}</code>
+                  </summary>
+                  <pre className="pcr-payload">{JSON.stringify(event, null, 2)}</pre>
+                  <CopyButton
+                    label={`Copy event ${event.sourceSeq} payload`}
+                    value={JSON.stringify(event, null, 2)}
+                  />
+                </details>
+              </li>
+            ))}
+          </ol>
+          </div>
+        ) : null}
+
+      {tab === "requests" ? (
+        <dl className="pcr-inspector-grid" data-testid="inspector-requests">
+          {(snapshot?.requests ?? []).map((request) => (
+            <div key={request.requestId}>
+              <dt>
+                <code>{request.requestId}</code>
+              </dt>
+              <dd>
+                {request.type} — {request.status}
+              </dd>
+            </div>
+          ))}
+          {(snapshot?.requests.length ?? 0) === 0 ? <p>No runtime requests yet.</p> : null}
+        </dl>
+      ) : null}
+
+      {tab === "capabilities" ? (
+        <ul className="pcr-capability-list" data-testid="inspector-capabilities">
+          {capabilityRows(state?.capabilities ?? { resume: false, typedEvents: false, steering: false, interruption: false, structuredResult: false }).map(
+            (row) => (
+              <li key={row.name}>
+                <span>{row.name}</span>
+                <Badge tone={row.supported ? "success" : "warning"}>
+                  {row.supported ? "supported" : "unsupported"}
+                </Badge>
+                {row.diagnostic === null ? null : (
+                  <p className="pcr-capability-diagnostic">{row.diagnostic}</p>
+                )}
+              </li>
+            ),
+          )}
+        </ul>
+      ) : null}
+
+      {tab === "session" ? (
+        <dl className="pcr-inspector-grid" data-testid="inspector-session">
+          <div>
+            <dt>Run</dt>
+            <dd>{state?.runId ?? "—"}</dd>
+          </div>
+          <div>
+            <dt>Normalized session</dt>
+            <dd>{state?.normalizedSessionId ?? "—"}</dd>
+          </div>
+          <div>
+            <dt>Driver session</dt>
+            <dd>{state?.driverSession.driverSessionId ?? "—"}</dd>
+          </div>
+          <div>
+            <dt>Source cursors</dt>
+            <dd>{JSON.stringify(snapshot?.sourceCursors ?? {})}</dd>
+          </div>
+          <div>
+            <dt>Integrity</dt>
+            <dd>{snapshot?.integrity ?? "—"}</dd>
+          </div>
+          <div>
+            <dt>Gaps</dt>
+            <dd>{snapshot?.gaps.length ?? 0}</dd>
+          </div>
+          <div>
+            <dt>Connection</dt>
+            <dd>
+              {connection}
+              {connection === "reconnecting" ? ` (attempt ${reconnectAttempt})` : ""}
+            </dd>
+          </div>
+          <div>
+            <dt>Credentials in browser</dt>
+            <dd>{state?.credentialsExposed === true ? "yes" : "no"}</dd>
+          </div>
+          <div>
+            <dt>Live and replay reducer</dt>
+            <dd data-testid="replay-parity">
+              {replayParity === null ? "not compared yet" : replayParity ? "match" : "mismatch"}
+            </dd>
+          </div>
+        </dl>
+      ) : null}
+      </Tabs>
+    </section>
+  );
+}
diff --git a/packages/paperclip-runner/src/react/public-contract.test.tsx b/packages/paperclip-runner/src/react/public-contract.test.tsx
new file mode 100644
index 00000000000..3a7e6a6b6cd
--- /dev/null
+++ b/packages/paperclip-runner/src/react/public-contract.test.tsx
@@ -0,0 +1,92 @@
+import * as React from "react";
+import { renderToStaticMarkup } from "react-dom/server";
+import { describe, expect, it } from "vitest";
+
+import type { SessionItemSnapshot } from "../reducer/session-reducer.js";
+import type { TranscriptEntry } from "../browser/transcript-model.js";
+import { Composer } from "./components/composer.js";
+import { Conversation } from "./components/conversation.js";
+import { RequestCard } from "./request-card.js";
+import { SessionTimeline } from "./session-timeline.js";
+
+const item: SessionItemSnapshot = {
+  itemId: "assistant-1",
+  kind: "agentMessage",
+  status: "completed",
+  text: "Canonical answer",
+};
+
+const entries: TranscriptEntry[] = [
+  {
+    kind: "item",
+    key: "item:assistant-1",
+    position: 1,
+    role: "assistant",
+    item,
+    interrupted: false,
+    streaming: false,
+    toolName: null,
+    input: null,
+    output: null,
+    failure: null,
+  },
+];
+
+describe("public React contracts", () => {
+  it("renders reducer-backed transcript semantics and the item renderer seam", () => {
+    const html = renderToStaticMarkup(
+      <Conversation entries={entries} renderItemBody={(entry) => <mark>{entry.text}</mark>} />,
+    );
+    expect(html).toContain('data-slot="conversation"');
+    expect(html).toContain('role="log"');
+    expect(html).toContain('class="pcr-message"');
+    expect(html).toContain("<mark>Canonical answer</mark>");
+  });
+
+  it("keeps request status controls around the request-detail renderer", () => {
+    const request = {
+      kind: "request" as const,
+      key: "request:r1",
+      position: 2,
+      requestId: "r1",
+      requestKind: "command_approval",
+      type: "approval",
+      prompt: "Run command?",
+      status: "pending" as const,
+      actions: ["accept", "decline"],
+      details: { command: "printf safe" },
+      resolvedAction: null,
+      resolvedAt: null,
+      turnId: "turn-1",
+    };
+    const html = renderToStaticMarkup(
+      <ol><RequestCard request={request} onResolve={() => undefined} renderRequestDetail={() => <code>custom detail</code>} /></ol>,
+    );
+    expect(html).toContain('data-slot="request-card"');
+    expect(html).toContain("custom detail");
+    expect(html).toContain("Approve");
+    expect(html).toContain("Reject");
+  });
+
+  it("exposes composer slots and canonical session timeline without a parallel model", () => {
+    const composer = renderToStaticMarkup(
+      <Composer state="idle" value="hello" onValueChange={() => undefined} onSubmit={() => undefined} onStop={() => undefined} leadingActions={<span>leading</span>} trailingActions={<span>trailing</span>} />,
+    );
+    const timeline = renderToStaticMarkup(<SessionTimeline snapshot={null} state={null} />);
+    expect(composer).toContain('data-slot="composer"');
+    expect(composer).toContain("leading");
+    expect(composer).toContain("trailing");
+    expect(timeline).toContain('data-slot="session-timeline"');
+  });
+
+  it("keeps exact failed-item diagnostics in the rendered record", () => {
+    const failedEntries: TranscriptEntry[] = [{
+      ...entries[0]!,
+      item: { ...item, status: "failed", text: "Partial output" },
+      failure: "exact upstream diagnostic",
+    }];
+    const html = renderToStaticMarkup(<Conversation entries={failedEntries} />);
+    expect(html).toContain('data-testid="item-failure"');
+    expect(html).toContain("exact upstream diagnostic");
+  });
+});
diff --git a/packages/paperclip-runner/src/react/replay-controls.tsx b/packages/paperclip-runner/src/react/replay-controls.tsx
new file mode 100644
index 00000000000..a1791f88cd7
--- /dev/null
+++ b/packages/paperclip-runner/src/react/replay-controls.tsx
@@ -0,0 +1,38 @@
+import * as React from "react";
+
+import { Button } from "./components/button.js";
+import type { RunnerConsole } from "./use-runner-console.js";
+
+export function ReplayControls({ replay }: { replay: RunnerConsole["replay"] }) {
+  const positionId = React.useId();
+  return (
+    <div data-slot="replay-controls" className="pcr-replay-stepper" data-testid="replay-controls">
+      <Button type="button" onClick={replay.togglePlay}>{replay.playing ? "Pause" : "Play"}</Button>
+      <Button type="button" variant="ghost" onClick={() => replay.step(-1)}>Step back</Button>
+      <Button type="button" variant="ghost" onClick={() => replay.step(1)}>Step forward</Button>
+      <label htmlFor={positionId}>Position</label>
+      <input
+        id={positionId}
+        type="range"
+        min={0}
+        max={replay.length}
+        value={replay.position}
+        data-testid="replay-position"
+        onChange={(event) => replay.setPosition(Number(event.target.value))}
+        onKeyDown={(event) => {
+          if (event.key === "ArrowLeft") {
+            event.preventDefault();
+            replay.step(-1);
+          } else if (event.key === "ArrowRight") {
+            event.preventDefault();
+            replay.step(1);
+          } else if (event.key === " ") {
+            event.preventDefault();
+            replay.togglePlay();
+          }
+        }}
+      />
+      <span>{replay.position} / {replay.length}</span>
+    </div>
+  );
+}
diff --git a/packages/paperclip-runner/src/react/request-card.tsx b/packages/paperclip-runner/src/react/request-card.tsx
new file mode 100644
index 00000000000..fa2f40ebd54
--- /dev/null
+++ b/packages/paperclip-runner/src/react/request-card.tsx
@@ -0,0 +1,174 @@
+import * as React from "react";
+
+import { Badge } from "./components/badge.js";
+import { Button } from "./components/button.js";
+import { runtimeRequestSubmission, type TranscriptRequestEntry } from "../browser/transcript-model.js";
+
+const KIND_LABELS: Record<string, string> = {
+  command_approval: "Command",
+  file_approval: "File change",
+  permission_approval: "Permission",
+  user_input: "Input",
+  elicitation: "Input",
+};
+
+const ACTION_LABELS: Record<string, string> = {
+  accept: "Approve",
+  accept_for_session: "Approve for session",
+  decline: "Reject",
+  cancel: "Cancel",
+  submit: "Submit",
+};
+
+const STATUS_TONE = {
+  pending: "accent",
+  resolved: "success",
+  expired: "warning",
+  cancelled: "warning",
+} as const;
+
+function detailBlock(details: Record<string, unknown>): string | null {
+  const command = details.command;
+  if (typeof command === "string") return command;
+  const diff = details.diff;
+  if (typeof diff === "string") {
+    const path = typeof details.path === "string" ? `${details.path}\n` : "";
+    return `${path}${diff}`;
+  }
+  return null;
+}
+
+/**
+ * One card renders all five request kinds. Actions come from the upstream
+ * request contract, so the card can never invent an affordance the runner
+ * cannot honour, and the first click locks the row until the canonical
+ * resolved event arrives.
+ */
+export function RequestCard({
+  request,
+  onResolve,
+  focusRef,
+  renderRequestDetail,
+}: {
+  request: TranscriptRequestEntry;
+  onResolve: (resolution: Record<string, unknown>) => void;
+  focusRef?: React.Ref<HTMLLIElement>;
+  renderRequestDetail?: (request: TranscriptRequestEntry) => React.ReactNode;
+}) {
+  const [answer, setAnswer] = React.useState("");
+  const [resolving, setResolving] = React.useState(false);
+  const answerId = React.useId();
+  const kindLabel = KIND_LABELS[request.requestKind] ?? "Request";
+  const pending = request.status === "pending";
+  const isInput = request.requestKind === "user_input" || request.requestKind === "elicitation";
+  const payload = detailBlock(request.details);
+  const detail = renderRequestDetail?.(request)
+    ?? (payload === null ? null : <pre className="pcr-payload">{payload}</pre>);
+
+  React.useEffect(() => {
+    if (!pending) setResolving(false);
+  }, [pending]);
+
+  function submit(resolution: Record<string, unknown>) {
+    setResolving(true);
+    onResolve(resolution);
+  }
+
+  if (!pending) {
+    return (
+      <li
+        ref={focusRef}
+        data-slot="request-card"
+        className="pcr-request pcr-request--settled"
+        data-status={request.status}
+        data-testid="request-card"
+        tabIndex={-1}
+      >
+        <details>
+          <summary className="pcr-request-summary">
+            <span>
+              {kindLabel} · {request.status === "resolved"
+                ? `resolved — ${ACTION_LABELS[request.resolvedAction ?? ""] ?? request.resolvedAction ?? "unknown"}`
+                : request.status === "expired"
+                  ? "expired before response"
+                  : "cancelled"}
+            </span>
+            <Badge tone={STATUS_TONE[request.status]}>{request.status}</Badge>
+          </summary>
+          <p className="pcr-request-prompt">{request.prompt}</p>
+          <p className="pcr-request-meta">
+            <code>{request.requestId}</code>
+            {request.resolvedAt === null ? null : <time dateTime={request.resolvedAt}>{request.resolvedAt}</time>}
+          </p>
+          {detail}
+        </details>
+      </li>
+    );
+  }
+
+  return (
+    <li
+      ref={focusRef}
+      data-slot="request-card"
+      className="pcr-request"
+      data-status="pending"
+      data-testid="request-card"
+      tabIndex={-1}
+    >
+      <div className="pcr-request-header">
+        <span className="pcr-request-kind">{kindLabel}</span>
+        <Badge tone="accent">pending</Badge>
+      </div>
+      <p className="pcr-request-prompt">{request.prompt}</p>
+      <p className="pcr-request-meta">
+        <code>{request.requestId}</code>
+      </p>
+      {detail}
+      {isInput ? (
+        <div className="pcr-request-input">
+          <label htmlFor={answerId}>Answer</label>
+          <input
+            id={answerId}
+            data-testid="request-answer"
+            value={answer}
+            disabled={resolving}
+            onChange={(event) => setAnswer(event.target.value)}
+          />
+        </div>
+      ) : null}
+      <div className="pcr-request-actions">
+        {request.actions.map((action) => (
+          <Button
+            key={action}
+            type="button"
+            className={
+              action === "decline"
+                ? "pcr-button--danger"
+                : action === "cancel"
+                  ? "pcr-button--quiet"
+                  : action === "accept" || action === "submit"
+                    ? ""
+                    : "pcr-button--secondary"
+            }
+            disabled={resolving || (action === "submit" && answer.trim().length === 0)}
+            data-testid={`request-action-${action}`}
+            onClick={() =>
+              submit(
+                action === "submit"
+                  ? runtimeRequestSubmission(request.requestKind, answer)
+                  : { action },
+              )
+            }
+          >
+            {ACTION_LABELS[action] ?? action}
+          </Button>
+        ))}
+      </div>
+      {resolving ? (
+        <p className="pcr-request-resolving" role="status">
+          Resolving — waiting for the canonical resolved event.
+        </p>
+      ) : null}
+    </li>
+  );
+}
diff --git a/packages/paperclip-runner/src/react/runner-console-app.tsx b/packages/paperclip-runner/src/react/runner-console-app.tsx
new file mode 100644
index 00000000000..4462f7a72c6
--- /dev/null
+++ b/packages/paperclip-runner/src/react/runner-console-app.tsx
@@ -0,0 +1,219 @@
+import * as React from "react";
+
+import type { RunnerClientOptions } from "../browser/client.js";
+import type { SessionItemSnapshot } from "../reducer/session-reducer.js";
+import type { TranscriptRequestEntry } from "../browser/transcript-model.js";
+import { Badge } from "./components/badge.js";
+import { Banner, BannerActions, BannerText } from "./components/banner.js";
+import { Button } from "./components/button.js";
+import { Composer } from "./components/composer.js";
+import { Conversation } from "./components/conversation.js";
+import { Dialog } from "./components/dialog.js";
+import { Tabs } from "./components/tabs.js";
+import { ConnectionBanner } from "./connection-banner.js";
+import { Inspector } from "./inspector.js";
+import { ReplayControls } from "./replay-controls.js";
+import { ConnectionBlock, GoalBlock, LineageTree, ManifestList } from "./session-timeline.js";
+import { useRunnerConsole } from "./use-runner-console.js";
+
+const MOBILE_SEGMENTS = [
+  { id: "chat", label: "Chat" },
+  { id: "session", label: "Session" },
+  { id: "inspector", label: "Inspector" },
+];
+const COMPACT_QUERY = "(max-width: 56.25rem)";
+
+function useCompactLayout(): boolean {
+  const [compact, setCompact] = React.useState(
+    () => typeof window !== "undefined" && window.matchMedia?.(COMPACT_QUERY).matches === true,
+  );
+  React.useEffect(() => {
+    const query = window.matchMedia?.(COMPACT_QUERY);
+    if (query === undefined) return undefined;
+    const onChange = () => setCompact(query.matches);
+    onChange();
+    query.addEventListener("change", onChange);
+    return () => query.removeEventListener("change", onChange);
+  }, []);
+  return compact;
+}
+
+export interface RunnerConsoleAppProps extends RunnerClientOptions {
+  renderItemBody?: (item: SessionItemSnapshot) => React.ReactNode;
+  renderRequestDetail?: (request: TranscriptRequestEntry) => React.ReactNode;
+}
+
+export function RunnerConsoleApp({
+  baseUrl,
+  fetchImpl,
+  eventSourceFactory,
+  renderItemBody,
+  renderRequestDetail,
+}: RunnerConsoleAppProps = {}) {
+  const console_ = useRunnerConsole({ baseUrl, fetchImpl, eventSourceFactory });
+  const [draft, setDraft] = React.useState("");
+  const [inspectorOpen, setInspectorOpen] = React.useState(false);
+  const [segment, setSegment] = React.useState("chat");
+  const [resetOpen, setResetOpen] = React.useState(false);
+  const [highlightItemId, setHighlightItemId] = React.useState<string | null>(null);
+  const [outcomes, setOutcomes] = React.useState<Record<string, string>>({});
+  const compact = useCompactLayout();
+  const manifestId = console_.state?.manifest ?? console_.selectedManifestId;
+  const activeManifest = console_.manifests.find((entry) => entry.id === manifestId);
+  const pendingRequests = console_.transcript.filter(
+    (entry): entry is TranscriptRequestEntry => entry.kind === "request" && entry.status === "pending",
+  );
+  const viewingChild = console_.selectedThreadId !== null;
+
+  React.useEffect(() => {
+    const stored = window.localStorage.getItem("paperclip-runner.sdk.v1.inspector");
+    if (stored === "open") setInspectorOpen(true);
+  }, []);
+
+  React.useEffect(() => {
+    window.localStorage.setItem(
+      "paperclip-runner.sdk.v1.inspector",
+      inspectorOpen ? "open" : "closed",
+    );
+  }, [inspectorOpen]);
+
+  React.useEffect(() => {
+    const snapshot = console_.snapshot;
+    if (snapshot === null || console_.state === null) return;
+    if (!["completed", "failed", "interrupted", "cancelled"].includes(snapshot.turnState)) return;
+    setOutcomes((current) => ({
+      ...current,
+      [console_.state!.manifest ?? "unknown"]: snapshot.turnState === "completed" ? "passed observations" : snapshot.turnState,
+    }));
+  }, [console_.snapshot, console_.state]);
+
+  function submit() {
+    const text = draft.trim();
+    if (text.length === 0) return;
+    setDraft("");
+    if (console_.composer === "active-turn") void console_.steer(text);
+    else void console_.send(text);
+  }
+
+  function runManifest(id: string) {
+    const manifest = console_.manifests.find((entry) => entry.id === id);
+    void console_.start({ manifestId: id, message: manifest?.prompt ?? "Run the demo." });
+  }
+
+  const transcript = (
+    <>
+      <Conversation
+        entries={console_.transcript}
+        highlightItemId={highlightItemId}
+        onResolveRequest={(request, resolution) => void console_.resolve(request.requestId, request.turnId ?? "", resolution)}
+        {...(renderItemBody === undefined ? {} : { renderItemBody })}
+        {...(renderRequestDetail === undefined ? {} : { renderRequestDetail })}
+      />
+      <ul className="pcr-steering-list" aria-label="Steering messages">
+        {console_.steeringChips.map((chip) => (
+          <li key={chip.id} className="pcr-steering-chip" data-status={chip.status} data-testid="steering-chip">
+            <Badge tone={chip.status === "acknowledged" ? "success" : chip.status === "pending" ? "accent" : "danger"}>{chip.status}</Badge>
+            <span>{chip.text}</span>
+            {chip.status === "rejected" || chip.status === "failed" ? (
+              <Button
+                type="button"
+                variant="ghost"
+                data-testid="steer-as-new-message"
+                onClick={() => {
+                  console_.dismissSteeringChip(chip.id);
+                  void console_.send(chip.text);
+                }}
+              >
+                Send as new message
+              </Button>
+            ) : null}
+          </li>
+        ))}
+      </ul>
+    </>
+  );
+  const composer = (
+    <div className="pcr-composer-region">
+      <ConnectionBanner connection={console_.connection} reconnectAttempt={console_.reconnectAttempt} onRetry={console_.retryNow} />
+      {pendingRequests.length > 0 ? (
+        <Banner tone="accent" assertive data-testid="pending-request-banner">
+          <BannerText>{pendingRequests.length} request waiting — Review</BannerText>
+          <BannerActions><Button type="button" onClick={() => document.querySelector<HTMLElement>('[data-slot="request-card"]')?.focus()}>Review</Button></BannerActions>
+        </Banner>
+      ) : null}
+      <Composer
+        state={console_.composer}
+        value={draft}
+        onValueChange={setDraft}
+        onSubmit={submit}
+        onStop={() => void console_.interrupt()}
+        disabledReason={viewingChild
+          ? "Direct steering of child threads is not supported by this app-server."
+          : null}
+      />
+    </div>
+  );
+  const sessionRail = (
+    <>
+      <ManifestList manifests={console_.manifests} selectedId={console_.selectedManifestId} onSelect={console_.selectManifest} onRun={runManifest} lastOutcome={outcomes} disabled={console_.busy} />
+      <ConnectionBlock connection={console_.connection} reconnectAttempt={console_.reconnectAttempt} state={console_.state} pendingRequestCount={pendingRequests.length} onDrop={console_.dropConnection} onRetry={console_.retryNow} onScrollToOldestRequest={() => document.querySelector<HTMLElement>('[data-slot="request-card"]')?.focus()} />
+      <GoalBlock state={console_.state} onGoal={(operation, body) => void console_.goal(operation, body)} />
+      <LineageTree lineage={console_.state?.lineage ?? []} selectedThreadId={console_.selectedThreadId} onSelect={console_.selectThread} />
+      <section data-slot="observation-checklist" className="pcr-panel">
+        <h2 className="pcr-panel-title">Demo state</h2>
+        <Button type="button" variant="ghost" onClick={() => setResetOpen(true)}>Reset demo state</Button>
+        {activeManifest === undefined ? null : (
+          <ol className="pcr-observation-list" data-testid="observation-checklist">
+            {activeManifest.expectedObservations.map((observation) => (
+              <li key={observation}>
+                <label><input type="checkbox" /> {observation}</label>
+              </li>
+            ))}
+          </ol>
+        )}
+      </section>
+    </>
+  );
+  const inspector = (
+    <Inspector events={console_.events} snapshot={console_.snapshot} state={console_.state} connection={console_.connection} reconnectAttempt={console_.reconnectAttempt} replayParity={console_.replayParity} highlightItemId={highlightItemId} onHighlightItem={setHighlightItemId} />
+  );
+
+  return (
+    <div className="pcr-root pcr-console" data-slot="runner-console-app" data-inspector={inspectorOpen}>
+      <header className="pcr-console-header">
+        <div className="pcr-console-title">
+          {console_.replay.active ? <Badge tone="warning" data-testid="replay-badge">REPLAY</Badge> : null}
+          <h1>{activeManifest?.name ?? "Runner reference console"}</h1>
+          {viewingChild ? (
+            <p className="pcr-breadcrumb" data-testid="breadcrumb">
+              root ▸ {console_.selectedThreadId}
+            </p>
+          ) : null}
+        </div>
+        <div className="pcr-console-header-actions">
+          <Button type="button" variant="ghost" data-testid="toggle-inspector" aria-pressed={inspectorOpen} onClick={() => setInspectorOpen((current) => !current)}>Protocol inspector</Button>
+          <Button type="button" variant="ghost" data-testid="toggle-replay" aria-pressed={console_.replay.active} disabled={console_.events.length === 0} onClick={() => console_.replay.active ? console_.replay.exit() : console_.replay.enter()}>{console_.replay.active ? "Exit replay" : "Replay"}</Button>
+        </div>
+      </header>
+      <p className="pcr-visually-hidden" aria-live="polite" data-testid="runner-announcement">{console_.announcement}</p>
+      {console_.error === null ? null : <Banner tone="danger" assertive><BannerText>{console_.error}</BannerText></Banner>}
+      {console_.replay.active ? <ReplayControls replay={console_.replay} /> : null}
+      {compact ? (
+        <div className="pcr-console-mobile">
+          <Tabs items={MOBILE_SEGMENTS} selected={segment} onSelect={setSegment} label="Console sections">
+            {segment === "chat" ? <>{transcript}{composer}</> : null}
+            {segment === "session" ? sessionRail : null}
+            {segment === "inspector" ? inspector : null}
+          </Tabs>
+        </div>
+      ) : (
+        <div className="pcr-console-desktop">
+          <aside className="pcr-console-rail">{sessionRail}</aside>
+          <main className="pcr-console-center">{transcript}{composer}</main>
+          {inspectorOpen ? <aside className="pcr-console-inspector" aria-label="Protocol inspector">{inspector}</aside> : null}
+        </div>
+      )}
+      <Dialog open={resetOpen} onClose={() => setResetOpen(false)} title="Reset demo state" description="Discards the current live session transcript. Recorded evidence files are not touched." footer={<><Button type="button" variant="ghost" onClick={() => setResetOpen(false)}>Keep the session</Button><Button type="button" variant="danger" data-testid="reset-confirm" onClick={() => { setResetOpen(false); setDraft(""); void console_.reset(); }}>Reset demo state</Button></>} />
+    </div>
+  );
+}
diff --git a/packages/paperclip-runner/src/react/session-timeline.tsx b/packages/paperclip-runner/src/react/session-timeline.tsx
new file mode 100644
index 00000000000..8dc19cf5040
--- /dev/null
+++ b/packages/paperclip-runner/src/react/session-timeline.tsx
@@ -0,0 +1,375 @@
+import * as React from "react";
+
+import type { SessionSnapshot } from "../reducer/session-reducer.js";
+import { Badge } from "./components/badge.js";
+import { Button } from "./components/button.js";
+import { Dialog } from "./components/dialog.js";
+import { Menu } from "./components/menu.js";
+import type {
+  GoalOperation,
+  ConnectionStatus,
+  RunnerLineageEntry,
+  ManifestSummary,
+  RunnerSessionState,
+} from "../browser/protocol.js";
+import { GOAL_OPERATION_LABELS } from "../browser/protocol.js";
+import { goalAvailability } from "../browser/transcript-model.js";
+
+const CONNECTION_TONE = {
+  idle: "neutral",
+  connecting: "accent",
+  connected: "success",
+  reconnecting: "warning",
+  disconnected: "danger",
+  terminal: "neutral",
+} as const;
+
+const THREAD_STATE_LABEL: Record<string, string> = {
+  starting: "Starting",
+  running: "Running",
+  completed: "Completed",
+  failed: "Failed",
+};
+
+/** Reducer-authoritative timeline, lineage, and goal summary. */
+export function SessionTimeline({
+  snapshot,
+  state,
+}: {
+  snapshot: SessionSnapshot | null;
+  state: RunnerSessionState | null;
+}) {
+  const headingId = React.useId();
+  return (
+    <section data-slot="session-timeline" className="pcr-panel" aria-labelledby={headingId}>
+      <h2 id={headingId} className="pcr-panel-title">Session timeline</h2>
+      <dl className="pcr-identity-grid">
+        <div><dt>Goal</dt><dd>{state?.goal?.objective ?? "No goal set"}</dd></div>
+        <div><dt>State</dt><dd>{snapshot?.sessionState ?? "not started"}</dd></div>
+      </dl>
+      <ol className="pcr-timeline" data-testid="session-timeline">
+        {(snapshot?.timeline ?? []).map((entry) => (
+          <li key={entry.sourceEventId}>
+            <code>{entry.sourceSeq}</code><span>{entry.summary}</span>
+          </li>
+        ))}
+      </ol>
+    </section>
+  );
+}
+
+export function ManifestList({
+  manifests,
+  selectedId,
+  onSelect,
+  onRun,
+  lastOutcome,
+  disabled,
+}: {
+  manifests: readonly ManifestSummary[];
+  selectedId: string;
+  onSelect: (id: string) => void;
+  onRun: (id: string) => void;
+  lastOutcome: Record<string, string>;
+  disabled: boolean;
+}) {
+  return (
+    <section data-slot="manifest-list" className="pcr-panel" aria-labelledby="manifest-heading">
+      <h2 id="manifest-heading" className="pcr-panel-title">
+        Demo chats
+      </h2>
+      <ul className="pcr-manifest-list" data-testid="manifest-list">
+        {manifests.map((manifest) => (
+          <li key={manifest.id} data-selected={manifest.id === selectedId}>
+            <button
+              type="button"
+              className="pcr-manifest-row"
+              aria-pressed={manifest.id === selectedId}
+              data-testid={`manifest-${manifest.id}`}
+              onClick={() => onSelect(manifest.id)}
+            >
+              <span className="pcr-manifest-name">{manifest.name}</span>
+              <span className="pcr-manifest-purpose">{manifest.purpose}</span>
+              <span className="pcr-manifest-badges">
+                {manifest.scenarios.map((scenario) => (
+                  <Badge key={scenario}>{scenario}</Badge>
+                ))}
+                <Badge tone={lastOutcome[manifest.id] === undefined ? "neutral" : "success"}>
+                  {lastOutcome[manifest.id] ?? "not run"}
+                </Badge>
+              </span>
+            </button>
+            {manifest.id === selectedId ? (
+              <>
+                <details className="pcr-disclosure" data-testid="expected-observations">
+                  <summary className="pcr-disclosure-summary">Expected observations</summary>
+                  <ol className="pcr-observation-list">
+                    {manifest.expectedObservations.map((observation) => (
+                      <li key={observation}>{observation}</li>
+                    ))}
+                  </ol>
+                </details>
+                <Button
+                  type="button"
+                  disabled={disabled}
+                  data-testid="run-manifest"
+                  onClick={() => onRun(manifest.id)}
+                >
+                  Run this demo chat
+                </Button>
+              </>
+            ) : null}
+          </li>
+        ))}
+      </ul>
+    </section>
+  );
+}
+
+export function ConnectionBlock({
+  connection,
+  reconnectAttempt,
+  state,
+  pendingRequestCount,
+  onDrop,
+  onRetry,
+  onScrollToOldestRequest,
+}: {
+  connection: ConnectionStatus;
+  reconnectAttempt: number;
+  state: RunnerSessionState | null;
+  pendingRequestCount: number;
+  onDrop: () => void;
+  onRetry: () => void;
+  onScrollToOldestRequest: () => void;
+}) {
+  return (
+    <section data-slot="connection-block" className="pcr-panel" aria-labelledby="connection-heading">
+      <h2 id="connection-heading" className="pcr-panel-title">
+        Session
+      </h2>
+      <div className="pcr-status-row">
+        <span>Connection</span>
+        <Badge tone={CONNECTION_TONE[connection]} data-testid="connection-status">
+          {connection === "reconnecting" ? `reconnecting (attempt ${reconnectAttempt})` : connection}
+        </Badge>
+      </div>
+      <div className="pcr-status-row">
+        <span>Pending requests</span>
+        <button
+          type="button"
+          className="pcr-chip"
+          data-testid="pending-request-chip"
+          disabled={pendingRequestCount === 0}
+          onClick={onScrollToOldestRequest}
+        >
+          {pendingRequestCount}
+        </button>
+      </div>
+      <div className="pcr-status-row">
+        <span>Credentials in browser</span>
+        <Badge tone={state?.credentialsExposed === true ? "danger" : "success"}>
+          {state?.credentialsExposed === true ? "exposed" : "none"}
+        </Badge>
+      </div>
+      <dl className="pcr-identity-grid">
+        <div>
+          <dt>Run</dt>
+          <dd>{state?.runId ?? "—"}</dd>
+        </div>
+        <div>
+          <dt>Session</dt>
+          <dd>{state?.normalizedSessionId ?? "—"}</dd>
+        </div>
+      </dl>
+      <div className="pcr-panel-actions">
+        <Button
+          type="button"
+          className="pcr-button--quiet"
+          data-testid="drop-connection"
+          disabled={state === null || connection === "disconnected"}
+          onClick={onDrop}
+        >
+          Simulate connection loss
+        </Button>
+        <Button
+          type="button"
+          className="pcr-button--quiet"
+          data-testid="resume-session"
+          disabled={state === null}
+          onClick={onRetry}
+        >
+          Resume this session
+        </Button>
+      </div>
+    </section>
+  );
+}
+
+export function GoalBlock({
+  state,
+  onGoal,
+}: {
+  state: RunnerSessionState | null;
+  onGoal: (operation: GoalOperation, body?: Record<string, unknown>) => void;
+}) {
+  const [dialogOpen, setDialogOpen] = React.useState(false);
+  const [objective, setObjective] = React.useState("");
+  const objectiveId = React.useId();
+  const triggerId = React.useId();
+  const capabilities = state?.capabilities ?? {
+    resume: false,
+    typedEvents: false,
+    steering: false,
+    interruption: false,
+    structuredResult: false,
+  };
+  const availability = goalAvailability(capabilities, state?.goal?.status ?? null);
+  const unsupported = capabilities.goals !== true;
+  const unsupportedReason = availability[0]?.reason ?? null;
+
+  return (
+    <section data-slot="goal-block" className="pcr-panel" aria-labelledby="goal-heading">
+      <div className="pcr-panel-header">
+        <h2 id="goal-heading" className="pcr-panel-title">
+          Goal
+        </h2>
+        <Menu
+          triggerId={triggerId}
+          label="Goal"
+          disabled={unsupported || state === null}
+          disabledReason={
+            state === null ? "Start a session before changing the goal." : unsupportedReason
+          }
+          items={availability.map((entry) => ({
+            id: entry.operation,
+            label: GOAL_OPERATION_LABELS[entry.operation],
+            enabled: entry.enabled,
+            reason: entry.reason,
+          }))}
+          onSelect={(id) => {
+            if (id === "set") setDialogOpen(true);
+            else onGoal(id as GoalOperation);
+          }}
+        />
+      </div>
+      {state === null ? null : state.goal === null ? (
+        <p className="pcr-goal-empty" data-testid="goal-banner">
+          {unsupported ? "Goal operations are unsupported here." : "No goal set"}
+        </p>
+      ) : (
+        <div className="pcr-goal-banner" data-testid="goal-banner">
+          <p className="pcr-goal-objective">{state.goal.objective}</p>
+          <div className="pcr-status-row">
+            <Badge tone={state.goal.status === "active" ? "success" : "warning"}>
+              {state.goal.status}
+            </Badge>
+            <time dateTime={new Date(state.goal.updatedAt).toISOString()}>
+              {new Date(state.goal.updatedAt).toISOString().slice(11, 19)}
+            </time>
+          </div>
+        </div>
+      )}
+      <Dialog
+        open={dialogOpen}
+        onClose={() => setDialogOpen(false)}
+        title="Set goal"
+        description="The goal is durable on the thread and every change is also a transcript event."
+        footer={
+          <>
+            <Button type="button" className="pcr-button--quiet" onClick={() => setDialogOpen(false)}>
+              Cancel
+            </Button>
+            <Button
+              type="button"
+              data-testid="goal-set-confirm"
+              disabled={objective.trim().length === 0}
+              onClick={() => {
+                onGoal("set", { objective: objective.trim() });
+                setObjective("");
+                setDialogOpen(false);
+              }}
+            >
+              Set goal
+            </Button>
+          </>
+        }
+      >
+        <label htmlFor={objectiveId}>Objective</label>
+        <textarea
+          id={objectiveId}
+          className="pcr-dialog-input"
+          data-testid="goal-objective"
+          rows={3}
+          value={objective}
+          onChange={(event) => setObjective(event.target.value)}
+        />
+      </Dialog>
+    </section>
+  );
+}
+
+export function LineageTree({
+  lineage,
+  selectedThreadId,
+  onSelect,
+}: {
+  lineage: readonly RunnerLineageEntry[];
+  selectedThreadId: string | null;
+  onSelect: (threadId: string | null) => void;
+}) {
+  const rootId = lineage.find((entry) => entry.depth === 0)?.threadId ?? null;
+  const current = selectedThreadId ?? rootId;
+  const treeRef = React.useRef<HTMLUListElement>(null);
+
+  function onKeyDown(event: React.KeyboardEvent<HTMLUListElement>) {
+    const rows = [
+      ...(treeRef.current?.querySelectorAll<HTMLButtonElement>('[role="treeitem"]') ?? []),
+    ];
+    const index = rows.indexOf(document.activeElement as HTMLButtonElement);
+    if (event.key === "ArrowDown") {
+      event.preventDefault();
+      rows[Math.min(index + 1, rows.length - 1)]?.focus();
+    } else if (event.key === "ArrowUp") {
+      event.preventDefault();
+      rows[Math.max(index - 1, 0)]?.focus();
+    }
+  }
+
+  return (
+    <section data-slot="lineage-tree" className="pcr-panel" aria-labelledby="lineage-heading">
+      <h2 id="lineage-heading" className="pcr-panel-title">
+        Threads
+      </h2>
+      <ul
+        ref={treeRef}
+        role="tree"
+        aria-label="Session thread lineage"
+        className="pcr-tree"
+        data-testid="lineage-tree"
+        onKeyDown={onKeyDown}
+      >
+        {lineage.length === 0 ? <li className="pcr-tree-empty">No threads yet.</li> : null}
+        {lineage.map((entry) => (
+          <li key={entry.threadId} role="none" data-depth={entry.depth}>
+            <button
+              type="button"
+              role="treeitem"
+              aria-current={entry.threadId === current}
+              aria-selected={entry.threadId === current}
+              className="pcr-tree-row"
+              data-testid={`thread-${entry.threadId}`}
+              onClick={() => onSelect(entry.depth === 0 ? null : entry.threadId)}
+            >
+              <span className="pcr-state-dot" data-state={entry.status} aria-hidden="true" />
+              <code>{entry.nickname ?? entry.threadId}</code>
+              <span className="pcr-tree-state">
+                {THREAD_STATE_LABEL[entry.status] ?? entry.status}
+              </span>
+            </button>
+          </li>
+        ))}
+      </ul>
+    </section>
+  );
+}
diff --git a/packages/paperclip-runner/src/react/use-runner-console.ts b/packages/paperclip-runner/src/react/use-runner-console.ts
new file mode 100644
index 00000000000..51cab9d9c9a
--- /dev/null
+++ b/packages/paperclip-runner/src/react/use-runner-console.ts
@@ -0,0 +1,594 @@
+import { useCallback, useEffect, useMemo, useRef, useState } from "react";
+
+import type { PrpEvent } from "../protocol/phase1-contract.js";
+import {
+  createSessionSnapshotFromMetadata,
+  reduceSessionEvents,
+  type SessionSnapshot,
+} from "../reducer/session-reducer.js";
+import {
+  createRunnerClient,
+  RunnerClientError,
+  type EventStreamHandle,
+  type RunnerClientOptions,
+} from "../browser/client.js";
+import type {
+  GoalOperation,
+  ConnectionStatus,
+  ManifestSummary,
+  RunnerSessionState,
+} from "../browser/protocol.js";
+import {
+  buildTranscript,
+  composerState,
+  type ComposerState,
+  type TranscriptEntry,
+} from "../browser/transcript-model.js";
+
+const SESSION_STORAGE_KEY = "paperclip-runner.sdk.v1.session";
+const RECONNECT_DELAY_MS = 1500;
+const MAX_RECONNECT_ATTEMPTS = 5;
+
+export type SteeringChipStatus = "pending" | "acknowledged" | "rejected" | "failed";
+
+export interface SteeringChip {
+  id: string;
+  text: string;
+  expectedTurnId: string;
+  status: SteeringChipStatus;
+  detail: string | null;
+}
+
+function reduceEvents(
+  state: RunnerSessionState | null,
+  events: readonly PrpEvent[],
+): SessionSnapshot | null {
+  if (state === null) return null;
+  const seed = createSessionSnapshotFromMetadata({
+    fixtureName: state.snapshot.fixtureName,
+    identity: state.snapshot.identity,
+    capabilities: state.snapshot.capabilities,
+  });
+  return reduceSessionEvents(seed, events);
+}
+
+function errorMessage(cause: unknown): string {
+  if (cause instanceof RunnerClientError) return cause.message;
+  return cause instanceof Error ? cause.message : String(cause);
+}
+
+export interface RunnerConsole {
+  manifests: ManifestSummary[];
+  selectedManifestId: string;
+  selectManifest: (id: string) => void;
+  state: RunnerSessionState | null;
+  events: PrpEvent[];
+  snapshot: SessionSnapshot | null;
+  transcript: TranscriptEntry[];
+  connection: ConnectionStatus;
+  reconnectAttempt: number;
+  replayParity: boolean | null;
+  composer: ComposerState;
+  steeringChips: SteeringChip[];
+  announcement: string;
+  error: string | null;
+  busy: boolean;
+  selectedThreadId: string | null;
+  selectThread: (threadId: string | null) => void;
+  replay: {
+    active: boolean;
+    position: number;
+    length: number;
+    playing: boolean;
+    enter: () => void;
+    exit: () => void;
+    setPosition: (position: number) => void;
+    togglePlay: () => void;
+    step: (delta: number) => void;
+  };
+  start: (input: { manifestId: string; message: string }) => Promise<void>;
+  send: (text: string) => Promise<void>;
+  steer: (text: string) => Promise<void>;
+  interrupt: () => Promise<void>;
+  resolve: (
+    requestId: string,
+    turnId: string,
+    resolution: Record<string, unknown>,
+  ) => Promise<void>;
+  goal: (operation: GoalOperation, body?: Record<string, unknown>) => Promise<void>;
+  dropConnection: () => void;
+  retryNow: () => void;
+  reset: () => Promise<void>;
+  dismissSteeringChip: (id: string) => void;
+}
+
+export function useRunnerConsole(options: RunnerClientOptions = {}): RunnerConsole {
+  const runnerClient = useMemo(
+    () => createRunnerClient(options),
+    [options.baseUrl, options.eventSourceFactory, options.fetchImpl],
+  );
+  const [manifests, setManifests] = useState<ManifestSummary[]>([]);
+  const [selectedManifestId, setSelectedManifestId] = useState("completion");
+  const [state, setState] = useState<RunnerSessionState | null>(null);
+  const [events, setEvents] = useState<PrpEvent[]>([]);
+  const [connection, setConnection] = useState<ConnectionStatus>("idle");
+  const [reconnectAttempt, setReconnectAttempt] = useState(0);
+  const [steeringChips, setSteeringChips] = useState<SteeringChip[]>([]);
+  const [announcement, setAnnouncement] = useState("");
+  const [error, setError] = useState<string | null>(null);
+  const [busy, setBusy] = useState(false);
+  const [interrupting, setInterrupting] = useState(false);
+  const [submitting, setSubmitting] = useState(false);
+  const [selectedThreadId, setSelectedThreadId] = useState<string | null>(null);
+  const [replayActive, setReplayActive] = useState(false);
+  const [replayPosition, setReplayPosition] = useState(0);
+  const [replayPlaying, setReplayPlaying] = useState(false);
+
+  const streamRef = useRef<EventStreamHandle | null>(null);
+  const streamGenerationRef = useRef(0);
+  const cursorRef = useRef(0);
+  const sessionIdRef = useRef<string | null>(null);
+  const retryTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null);
+
+  const closeStream = useCallback(() => {
+    streamGenerationRef.current += 1;
+    streamRef.current?.close();
+    streamRef.current = null;
+    if (retryTimerRef.current !== null) {
+      clearTimeout(retryTimerRef.current);
+      retryTimerRef.current = null;
+    }
+  }, []);
+
+  const subscribe = useCallback(
+    (sessionId: string, attempt = 0) => {
+      closeStream();
+      const generation = streamGenerationRef.current;
+      setConnection(attempt === 0 ? "connecting" : "reconnecting");
+      setReconnectAttempt(attempt);
+      const open = () => {
+        if (streamGenerationRef.current !== generation) return;
+        streamRef.current = runnerClient.openEventStream(sessionId, cursorRef.current, {
+          onOpen: () => {
+            setConnection("connected");
+            setReconnectAttempt(0);
+            setAnnouncement(attempt === 0 ? "Connected" : "Reconnected with gap recovery");
+          },
+          onEvent: (event) => {
+            cursorRef.current += 1;
+            // Preserve the exact canonical stream, including deliberate
+            // duplicate ids. The shared reducer, not the hook, owns duplicate
+            // detection and replay integrity.
+            setEvents((current) => [...current, event]);
+          },
+          onError: () => {
+            closeStream();
+            if (attempt >= MAX_RECONNECT_ATTEMPTS) {
+              setConnection("disconnected");
+              setAnnouncement("Disconnected");
+              return;
+            }
+            setConnection("reconnecting");
+            setReconnectAttempt(attempt + 1);
+            setAnnouncement(`Reconnecting, attempt ${attempt + 1}`);
+            retryTimerRef.current = setTimeout(
+              () => subscribe(sessionId, attempt + 1),
+              RECONNECT_DELAY_MS,
+            );
+          },
+        });
+      };
+
+      if (attempt === 0) {
+        open();
+        return;
+      }
+      void runnerClient.readEvents(sessionId, cursorRef.current).then((history) => {
+        if (streamGenerationRef.current !== generation) return;
+        setEvents((current) => [...current, ...history.events]);
+        cursorRef.current = history.cursor;
+        open();
+      }).catch(open);
+    },
+    [closeStream, runnerClient],
+  );
+
+  const adopt = useCallback(
+    (next: RunnerSessionState) => {
+      setState(next);
+      setError(null);
+    },
+    [],
+  );
+
+  const attach = useCallback(
+    async (sessionId: string, resume: boolean) => {
+      const [next, history] = await Promise.all([
+        runnerClient.readSession(sessionId),
+        runnerClient.readEvents(sessionId, 0),
+      ]);
+      sessionIdRef.current = sessionId;
+      window.sessionStorage.setItem(SESSION_STORAGE_KEY, sessionId);
+      adopt(next);
+      setEvents(history.events);
+      cursorRef.current = history.cursor;
+      if (resume) setAnnouncement("Replayed the durable transcript");
+      subscribe(sessionId, 0);
+    },
+    [adopt, runnerClient, subscribe],
+  );
+
+  useEffect(() => {
+    let cancelled = false;
+    void runnerClient
+      .fetchManifests()
+      .then((list) => {
+        if (cancelled) return;
+        setManifests(list);
+        if (list[0] !== undefined) setSelectedManifestId((current) => current || list[0]!.id);
+      })
+      .catch((cause) => {
+        if (!cancelled) setError(errorMessage(cause));
+      });
+    const stored = window.sessionStorage.getItem(SESSION_STORAGE_KEY);
+    if (stored !== null) {
+      void attach(stored, true).catch(() => {
+        window.sessionStorage.removeItem(SESSION_STORAGE_KEY);
+      });
+    }
+    return () => {
+      cancelled = true;
+    };
+    // Runs once: session restoration is a mount concern.
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, []);
+
+  useEffect(() => () => closeStream(), [closeStream]);
+
+  // Lineage, goal, pending requests, and the server cursor live in the public
+  // state, so a stream that only carries events would leave them stale.
+  useEffect(() => {
+    const sessionId = sessionIdRef.current;
+    if (sessionId === null || events.length === 0) return undefined;
+    const timer = setTimeout(() => {
+      void runnerClient
+        .readSession(sessionId)
+        .then((next) => setState(next))
+        .catch(() => undefined);
+    }, 150);
+    return () => clearTimeout(timer);
+  }, [events.length, runnerClient]);
+
+  const liveSnapshot = useMemo(() => reduceEvents(state, events), [state, events]);
+  const visibleEvents = useMemo(
+    () => (replayActive ? events.slice(0, replayPosition) : events),
+    [events, replayActive, replayPosition],
+  );
+  const snapshot = useMemo(
+    () => (replayActive ? reduceEvents(state, visibleEvents) : liveSnapshot),
+    [replayActive, state, visibleEvents, liveSnapshot],
+  );
+
+  const replayParity = useMemo(() => {
+    if (state === null || liveSnapshot === null) return null;
+    if (state.cursor !== events.length) return null;
+    return (
+      JSON.stringify(liveSnapshot.timeline) === JSON.stringify(state.snapshot.timeline) &&
+      liveSnapshot.integrity === state.snapshot.integrity
+    );
+  }, [state, liveSnapshot, events.length]);
+
+  const transcript = useMemo(
+    () => (snapshot === null ? [] : buildTranscript(snapshot, visibleEvents)),
+    [snapshot, visibleEvents],
+  );
+
+  useEffect(() => {
+    if (!replayPlaying) return undefined;
+    if (replayPosition >= events.length) {
+      setReplayPlaying(false);
+      return undefined;
+    }
+    const timer = setTimeout(() => setReplayPosition((current) => current + 1), 140);
+    return () => clearTimeout(timer);
+  }, [replayPlaying, replayPosition, events.length]);
+
+  // Steering chips resolve against canonical acknowledgements only.
+  useEffect(() => {
+    setSteeringChips((chips) => {
+      if (chips.every((chip) => chip.status !== "pending")) return chips;
+      const acknowledged = events.filter(
+        (event) =>
+          event.eventType === "item.completed" &&
+          (event.payload as { kind?: string }).kind === "steering_acknowledgement",
+      );
+      let index = 0;
+      return chips.map((chip) => {
+        if (chip.status !== "pending") return chip;
+        const match = acknowledged[index];
+        index += 1;
+        return match === undefined
+          ? chip
+          : { ...chip, status: "acknowledged" as const, detail: null };
+      });
+    });
+  }, [events]);
+
+  // The reducer is authoritative for the active turn. Falling back to the
+  // last public-state read would keep a finished turn alive in the composer.
+  const activeTurnId = snapshot === null ? (state?.activeTurnId ?? null) : snapshot.activeTurnId;
+
+  // A submitted turn that has not been accepted yet is a protocol fact, not a
+  // local flag: it is what makes interrupt-before-start reachable.
+  const awaitingTurnStart = useMemo(() => {
+    let pending = false;
+    for (const entry of snapshot?.timeline ?? []) {
+      if (entry.eventType === "turn.submitted") pending = true;
+      else if (entry.eventType.startsWith("turn.")) pending = false;
+    }
+    return pending;
+  }, [snapshot]);
+
+  const composer = composerState({
+    connection,
+    submitting: submitting || awaitingTurnStart,
+    interrupting,
+    activeTurnId,
+    sessionState: snapshot?.sessionState ?? "not_started",
+  });
+
+  const guard = useCallback(async (task: () => Promise<void>) => {
+    setBusy(true);
+    try {
+      await task();
+    } catch (cause) {
+      setError(errorMessage(cause));
+    } finally {
+      setBusy(false);
+    }
+  }, []);
+
+  const start = useCallback(
+    async (input: { manifestId: string; message: string }) => {
+      await guard(async () => {
+        closeStream();
+        setEvents([]);
+        cursorRef.current = 0;
+        setSteeringChips([]);
+        setReplayActive(false);
+        setReplayPosition(0);
+        setSelectedThreadId(null);
+        setSubmitting(true);
+        const manifest = manifests.find((entry) => entry.id === input.manifestId);
+        try {
+          const created = await runnerClient.createSession({
+            manifest: input.manifestId,
+            objective: manifest?.objective ?? "Run the runner console demo.",
+            message: input.message,
+          });
+          sessionIdRef.current = created.sessionId;
+          window.sessionStorage.setItem(SESSION_STORAGE_KEY, created.sessionId);
+          adopt(created);
+          setAnnouncement("Turn running");
+          subscribe(created.sessionId, 0);
+        } finally {
+          setSubmitting(false);
+        }
+      });
+    },
+    [adopt, closeStream, guard, manifests, runnerClient, subscribe],
+  );
+
+  const refreshState = useCallback(async () => {
+    const sessionId = sessionIdRef.current;
+    if (sessionId === null) return;
+    adopt(await runnerClient.readSession(sessionId));
+  }, [adopt, runnerClient]);
+
+  const send = useCallback(
+    async (text: string) => {
+      const sessionId = sessionIdRef.current;
+      if (sessionId === null) {
+        await start({ manifestId: selectedManifestId, message: text });
+        return;
+      }
+      await guard(async () => {
+        setSubmitting(true);
+        try {
+          adopt(await runnerClient.startTurn(sessionId, text));
+          setAnnouncement("Turn running");
+        } finally {
+          setSubmitting(false);
+        }
+      });
+    },
+    [adopt, guard, runnerClient, selectedManifestId, start],
+  );
+
+  const steer = useCallback(
+    async (text: string) => {
+      const sessionId = sessionIdRef.current;
+      const expectedTurnId = activeTurnId;
+      if (sessionId === null || expectedTurnId === null) return;
+      const chipId = `steer-${Date.now()}-${steeringChips.length}`;
+      setSteeringChips((chips) => [
+        ...chips,
+        { id: chipId, text, expectedTurnId, status: "pending", detail: null },
+      ]);
+      try {
+        adopt(await runnerClient.steerTurn(sessionId, expectedTurnId, text));
+        setAnnouncement("Steering sent");
+      } catch (cause) {
+        const stale =
+          cause instanceof RunnerClientError &&
+          (cause.code === "stale_turn" || cause.code === "already_terminal");
+        setSteeringChips((chips) =>
+          chips.map((chip) =>
+            chip.id === chipId
+              ? {
+                  ...chip,
+                  status: stale ? "rejected" : "failed",
+                  detail: stale ? "turn already ended" : errorMessage(cause),
+                }
+              : chip,
+          ),
+        );
+        setAnnouncement(stale ? "Steering rejected: turn already ended" : "Steering failed");
+        await refreshState().catch(() => undefined);
+      }
+    },
+    [activeTurnId, adopt, refreshState, runnerClient, steeringChips.length],
+  );
+
+  const interrupt = useCallback(async () => {
+    const sessionId = sessionIdRef.current;
+    if (sessionId === null) return;
+    setInterrupting(true);
+    setAnnouncement("Stopping");
+    try {
+      adopt(await runnerClient.interruptTurn(sessionId, activeTurnId));
+      setAnnouncement("Turn stopped");
+    } catch (cause) {
+      setError(errorMessage(cause));
+    } finally {
+      setInterrupting(false);
+    }
+  }, [activeTurnId, adopt, runnerClient]);
+
+  const resolve = useCallback(
+    async (requestId: string, turnId: string, resolution: Record<string, unknown>) => {
+      const sessionId = sessionIdRef.current;
+      if (sessionId === null) return;
+      await guard(async () => {
+        adopt(await runnerClient.resolveRequest(sessionId, requestId, turnId, resolution));
+        setAnnouncement("Request resolved");
+      });
+    },
+    [adopt, guard, runnerClient],
+  );
+
+  const goal = useCallback(
+    async (operation: GoalOperation, body: Record<string, unknown> = {}) => {
+      const sessionId = sessionIdRef.current;
+      if (sessionId === null) return;
+      await guard(async () => {
+        adopt(await runnerClient.goalOperation(sessionId, operation, body));
+        setAnnouncement(`Goal ${operation}`);
+      });
+    },
+    [adopt, guard, runnerClient],
+  );
+
+  const dropConnection = useCallback(() => {
+    const sessionId = sessionIdRef.current;
+    closeStream();
+    setConnection("reconnecting");
+    setReconnectAttempt(1);
+    setAnnouncement("Connection lost; automatic gap recovery scheduled");
+    if (sessionId !== null) {
+      retryTimerRef.current = setTimeout(
+        () => subscribe(sessionId, 1),
+        RECONNECT_DELAY_MS,
+      );
+    }
+  }, [closeStream, subscribe]);
+
+  const retryNow = useCallback(() => {
+    const sessionId = sessionIdRef.current;
+    if (sessionId === null) return;
+    void guard(async () => {
+      const resumed = await runnerClient.reconnectSession(sessionId);
+      adopt(resumed);
+      const history = await runnerClient.readEvents(sessionId, 0);
+      setEvents(history.events);
+      cursorRef.current = history.cursor;
+      subscribe(sessionId, 0);
+      setAnnouncement("Resumed the same session");
+    });
+  }, [adopt, guard, runnerClient, subscribe]);
+
+  const reset = useCallback(async () => {
+    const sessionId = sessionIdRef.current;
+    closeStream();
+    if (sessionId !== null) {
+      try {
+        await runnerClient.closeSession(sessionId);
+      } catch (cause) {
+        setConnection("disconnected");
+        setError(errorMessage(cause));
+        setAnnouncement("Demo reset failed");
+        return;
+      }
+    }
+    window.sessionStorage.removeItem(SESSION_STORAGE_KEY);
+    sessionIdRef.current = null;
+    cursorRef.current = 0;
+    setState(null);
+    setEvents([]);
+    setSteeringChips([]);
+    setConnection("idle");
+    setReplayActive(false);
+    setReplayPosition(0);
+    setSelectedThreadId(null);
+    setError(null);
+    setAnnouncement("Demo state reset");
+  }, [closeStream, runnerClient]);
+
+  const replay = useMemo(
+    () => ({
+      active: replayActive,
+      position: replayPosition,
+      length: events.length,
+      playing: replayPlaying,
+      enter: () => {
+        setReplayActive(true);
+        setReplayPosition(0);
+        setReplayPlaying(false);
+      },
+      exit: () => {
+        setReplayActive(false);
+        setReplayPlaying(false);
+      },
+      setPosition: (position: number) =>
+        setReplayPosition(Math.min(Math.max(position, 0), events.length)),
+      togglePlay: () => setReplayPlaying((current) => !current),
+      step: (delta: number) =>
+        setReplayPosition((current) =>
+          Math.min(Math.max(current + delta, 0), events.length),
+        ),
+    }),
+    [events.length, replayActive, replayPlaying, replayPosition],
+  );
+
+  return {
+    manifests,
+    selectedManifestId,
+    selectManifest: setSelectedManifestId,
+    state,
+    events,
+    snapshot,
+    transcript,
+    connection,
+    reconnectAttempt,
+    replayParity,
+    composer,
+    steeringChips,
+    announcement,
+    error,
+    busy,
+    selectedThreadId,
+    selectThread: setSelectedThreadId,
+    replay,
+    start,
+    send,
+    steer,
+    interrupt,
+    resolve,
+    goal,
+    dropConnection,
+    retryNow,
+    reset,
+    dismissSteeringChip: (id: string) =>
+      setSteeringChips((chips) => chips.filter((chip) => chip.id !== id)),
+  };
+}
diff --git a/packages/paperclip-runner/styles.css b/packages/paperclip-runner/styles.css
new file mode 100644
index 00000000000..513224ba634
--- /dev/null
+++ b/packages/paperclip-runner/styles.css
@@ -0,0 +1,1145 @@
+.pcr-root {
+  color-scheme: light;
+  --pcr-background: #f7f7f5;
+  --pcr-foreground: #191917;
+  --pcr-card: #ffffff;
+  --pcr-card-foreground: #191917;
+  --pcr-muted: #efefeb;
+  --pcr-muted-foreground: #66665f;
+  --pcr-border: #deded7;
+  --pcr-primary: #242420;
+  --pcr-primary-foreground: #ffffff;
+  --pcr-success: #17633a;
+  --pcr-success-surface: #e9f5ed;
+  --pcr-warning: #8a5a10;
+  --pcr-warning-surface: #fff4dc;
+  --pcr-danger: #a02f2f;
+  --pcr-danger-surface: #fceaea;
+  --pcr-accent: #2f5fa8;
+  --pcr-accent-foreground: #ffffff;
+  --pcr-accent-surface: #e9f0fa;
+  --pcr-surface-raised: #fcfcfa;
+  --pcr-ring: #66665f;
+  --pcr-font-sans: Inter, ui-sans-serif, system-ui, sans-serif;
+  --pcr-font-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
+  --pcr-font-size-xs: 0.75rem;
+  --pcr-font-size-sm: 0.875rem;
+  --pcr-font-size-md: 1rem;
+  --pcr-font-size-lg: 1.25rem;
+  --pcr-font-size-xl: 1.75rem;
+  --pcr-line-tight: 1.2;
+  --pcr-line-normal: 1.5;
+  --pcr-weight-medium: 500;
+  --pcr-weight-semibold: 600;
+  --pcr-space-1: 0.25rem;
+  --pcr-space-2: 0.5rem;
+  --pcr-space-3: 0.75rem;
+  --pcr-space-4: 1rem;
+  --pcr-space-5: 1.25rem;
+  --pcr-space-6: 1.5rem;
+  --pcr-space-8: 2rem;
+  --pcr-space-10: 2.5rem;
+  --pcr-radius-sm: 0.375rem;
+  --pcr-radius-md: 0.625rem;
+  --pcr-shadow-sm: 0 0.0625rem 0.125rem rgb(0 0 0 / 0.05);
+  --pcr-editor-height: 32rem;
+  --pcr-page-width: 90rem;
+  --pcr-control-height: 2.5rem;
+  --pcr-timeline-column: 2rem;
+  --pcr-motion-fast: 120ms;
+  --pcr-motion-medium: 200ms;
+  --pcr-z-banner: 10;
+  --pcr-z-dialog: 20;
+  --pcr-rail-width: 17rem;
+  --pcr-center-width: 48rem;
+  --pcr-inspector-width: 24rem;
+  --pcr-transcript-height: 34rem;
+  --pcr-touch-target: 2.75rem;
+  --pcr-facet-height: 6rem;
+  --pcr-conversation-min-width: 20rem;
+  --pcr-request-min-width: 17.5rem;
+  min-height: 100vh;
+  background: var(--pcr-background);
+  color: var(--pcr-foreground);
+  font-family: var(--pcr-font-sans);
+  font-size: var(--pcr-font-size-sm);
+  line-height: var(--pcr-line-normal);
+}
+
+.pcr-root,
+.pcr-root * {
+  box-sizing: border-box;
+}
+
+.pcr-root button,
+.pcr-root input,
+.pcr-root select,
+.pcr-root textarea {
+  font: inherit;
+}
+
+.pcr-root h1,
+.pcr-root h2,
+.pcr-root h3,
+.pcr-root p {
+  margin: 0;
+}
+
+.pcr-root h1 {
+  font-size: var(--pcr-font-size-xl);
+  line-height: var(--pcr-line-tight);
+}
+
+.pcr-root label,
+.pcr-root dt {
+  font-size: var(--pcr-font-size-xs);
+  font-weight: var(--pcr-weight-semibold);
+}
+
+.pcr-root select {
+  min-height: var(--pcr-control-height);
+  padding: var(--pcr-space-2) var(--pcr-space-3);
+  border: 0.0625rem solid var(--pcr-border);
+  border-radius: var(--pcr-radius-sm);
+  background: var(--pcr-card);
+  color: var(--pcr-card-foreground);
+}
+
+.pcr-eyebrow {
+  color: var(--pcr-muted-foreground);
+  font-size: var(--pcr-font-size-xs);
+  font-weight: var(--pcr-weight-semibold);
+  letter-spacing: 0.08em;
+  text-transform: uppercase;
+}
+
+.pcr-card {
+  display: grid;
+  gap: var(--pcr-space-5);
+  padding: var(--pcr-space-6);
+  background: var(--pcr-card);
+  color: var(--pcr-card-foreground);
+  border: 0.0625rem solid var(--pcr-border);
+  border-radius: var(--pcr-radius-md);
+  box-shadow: var(--pcr-shadow-sm);
+}
+
+.pcr-card-header,
+.pcr-card-content {
+  display: grid;
+  gap: var(--pcr-space-3);
+}
+
+.pcr-card-title {
+  font-size: var(--pcr-font-size-lg);
+  line-height: var(--pcr-line-tight);
+  font-weight: var(--pcr-weight-semibold);
+}
+
+.pcr-card-description {
+  color: var(--pcr-muted-foreground);
+  font-size: var(--pcr-font-size-sm);
+}
+
+.pcr-button {
+  min-height: var(--pcr-control-height);
+  padding: var(--pcr-space-2) var(--pcr-space-4);
+  border: 0;
+  border-radius: var(--pcr-radius-sm);
+  background: var(--pcr-primary);
+  color: var(--pcr-primary-foreground);
+  font-weight: var(--pcr-weight-medium);
+  cursor: pointer;
+  transition: opacity var(--pcr-motion-fast) ease;
+}
+
+.pcr-button:hover { opacity: 0.88; }
+.pcr-button:disabled { cursor: not-allowed; opacity: 0.5; }
+.pcr-button:focus-visible,
+.pcr-root select:focus-visible,
+.pcr-textarea:focus-visible {
+  outline: 0.125rem solid var(--pcr-ring);
+  outline-offset: 0.125rem;
+}
+
+.pcr-badge {
+  display: inline-flex;
+  align-items: center;
+  width: fit-content;
+  min-height: 1.625rem;
+  padding-inline: var(--pcr-space-2);
+  border-radius: 999rem;
+  background: var(--pcr-muted);
+  color: var(--pcr-muted-foreground);
+  font-size: var(--pcr-font-size-xs);
+  font-weight: var(--pcr-weight-semibold);
+  text-transform: capitalize;
+  white-space: nowrap;
+}
+
+.pcr-badge[data-tone="success"] { background: var(--pcr-success-surface); color: var(--pcr-success); }
+.pcr-badge[data-tone="warning"] { background: var(--pcr-warning-surface); color: var(--pcr-warning); }
+.pcr-badge[data-tone="danger"] { background: var(--pcr-danger-surface); color: var(--pcr-danger); }
+
+.pcr-textarea {
+  width: 100%;
+  min-height: var(--pcr-editor-height);
+  resize: vertical;
+  padding: var(--pcr-space-3);
+  border: 0.0625rem solid var(--pcr-border);
+  border-radius: var(--pcr-radius-sm);
+  background: var(--pcr-card);
+  color: var(--pcr-card-foreground);
+  font-family: var(--pcr-font-mono);
+  font-size: var(--pcr-font-size-xs);
+  line-height: var(--pcr-line-normal);
+}
+
+.pcr-console {
+  width: min(100%, var(--pcr-page-width));
+  margin-inline: auto;
+  padding: var(--pcr-space-5);
+}
+
+.pcr-conversation,
+.pcr-composer,
+.pcr-inspector,
+.pcr-inspector-events {
+  min-width: var(--pcr-conversation-min-width);
+}
+
+.pcr-request {
+  min-width: var(--pcr-request-min-width);
+}
+
+.pcr-timeline {
+  display: grid;
+  gap: var(--pcr-space-2);
+  margin: 0;
+  padding: 0;
+  list-style: none;
+}
+
+.pcr-timeline li {
+  display: grid;
+  grid-template-columns: var(--pcr-timeline-column) minmax(0, 1fr);
+  gap: var(--pcr-space-2);
+}
+
+.pcr-steering-list {
+  display: grid;
+  gap: var(--pcr-space-2);
+  margin: 0;
+  padding: 0;
+  list-style: none;
+}
+
+/* Promoted console components ------------------------------------------------ */
+
+.pcr-badge[data-tone="accent"] {
+  background: var(--pcr-accent-surface);
+  color: var(--pcr-accent);
+}
+
+.pcr-button--danger {
+  background: var(--pcr-danger);
+  color: var(--pcr-primary-foreground);
+}
+
+.pcr-button--secondary {
+  background: var(--pcr-muted);
+  color: var(--pcr-foreground);
+}
+
+.pcr-button--quiet {
+  background: transparent;
+  color: var(--pcr-foreground);
+  border: 0.0625rem solid var(--pcr-border);
+}
+
+.pcr-visually-hidden {
+  position: absolute;
+  width: 0.0625rem;
+  height: 0.0625rem;
+  margin: -0.0625rem;
+  padding: 0;
+  overflow: hidden;
+  clip-path: inset(50%);
+  white-space: nowrap;
+}
+
+.pcr-console {
+  display: grid;
+  gap: var(--pcr-space-4);
+}
+
+.pcr-console-header,
+.pcr-console-title,
+.pcr-console-header-actions {
+  display: flex;
+  align-items: center;
+  gap: var(--pcr-space-3);
+}
+
+.pcr-console-header {
+  justify-content: space-between;
+  flex-wrap: wrap;
+}
+
+.pcr-console-title h2 {
+  font-size: var(--pcr-font-size-lg);
+  font-weight: var(--pcr-weight-semibold);
+}
+
+.pcr-breadcrumb {
+  color: var(--pcr-muted-foreground);
+  font-family: var(--pcr-font-mono);
+  font-size: var(--pcr-font-size-xs);
+}
+
+.pcr-console-desktop {
+  display: grid;
+  grid-template-columns: var(--pcr-rail-width) minmax(0, 1fr);
+  gap: var(--pcr-space-5);
+  align-items: start;
+}
+
+.pcr-console[data-inspector="true"] .pcr-console-desktop {
+  grid-template-columns: var(--pcr-rail-width) minmax(0, 1fr) var(--pcr-inspector-width);
+}
+
+.pcr-console-rail,
+.pcr-console-inspector {
+  display: grid;
+  /* An auto track would size to the widest identifier and overflow the rail. */
+  grid-template-columns: minmax(0, 1fr);
+  gap: var(--pcr-space-4);
+  min-width: 0;
+}
+
+.pcr-console-center {
+  display: grid;
+  gap: var(--pcr-space-3);
+  min-width: 0;
+  max-width: var(--pcr-center-width);
+}
+
+.pcr-panel {
+  display: grid;
+  grid-template-columns: minmax(0, 1fr);
+  min-width: 0;
+  gap: var(--pcr-space-3);
+  padding: var(--pcr-space-4);
+  background: var(--pcr-card);
+  border: 0.0625rem solid var(--pcr-border);
+  border-radius: var(--pcr-radius-md);
+}
+
+.pcr-panel-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: var(--pcr-space-2);
+}
+
+.pcr-panel-title {
+  font-size: var(--pcr-font-size-sm);
+  font-weight: var(--pcr-weight-semibold);
+}
+
+.pcr-panel-actions {
+  display: grid;
+  gap: var(--pcr-space-2);
+}
+
+.pcr-status-row {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: var(--pcr-space-2);
+}
+
+.pcr-status-row > span:first-child {
+  color: var(--pcr-muted-foreground);
+  font-size: var(--pcr-font-size-xs);
+  font-weight: var(--pcr-weight-semibold);
+}
+
+.pcr-identity-grid {
+  display: grid;
+  grid-template-columns: minmax(0, 1fr);
+  gap: var(--pcr-space-2);
+  margin: 0;
+  min-width: 0;
+}
+
+.pcr-identity-grid > div,
+.pcr-inspector-grid > div,
+.pcr-status-row,
+.pcr-tree-row,
+.pcr-capability-list li {
+  min-width: 0;
+}
+
+.pcr-identity-grid dd,
+.pcr-inspector-grid dd {
+  overflow-wrap: anywhere;
+  white-space: normal;
+}
+
+/* Manifest list -------------------------------------------------------------- */
+
+.pcr-manifest-list,
+.pcr-tree,
+.pcr-transcript,
+.pcr-inspector-list,
+.pcr-observation-list {
+  display: grid;
+  gap: var(--pcr-space-2);
+  margin: 0;
+  padding: 0;
+  list-style: none;
+}
+
+.pcr-manifest-row {
+  display: grid;
+  grid-template-columns: minmax(0, 1fr);
+  gap: var(--pcr-space-1);
+  width: 100%;
+  min-width: 0;
+  min-height: var(--pcr-touch-target);
+  padding: var(--pcr-space-2);
+  border: 0.0625rem solid transparent;
+  border-radius: var(--pcr-radius-sm);
+  background: transparent;
+  color: inherit;
+  text-align: left;
+  cursor: pointer;
+}
+
+.pcr-manifest-row[aria-pressed="true"] {
+  border-color: var(--pcr-accent);
+  background: var(--pcr-accent-surface);
+}
+
+.pcr-manifest-name {
+  font-weight: var(--pcr-weight-semibold);
+}
+
+.pcr-manifest-purpose {
+  color: var(--pcr-muted-foreground);
+  font-size: var(--pcr-font-size-xs);
+  overflow-wrap: anywhere;
+}
+
+.pcr-manifest-badges {
+  display: flex;
+  flex-wrap: wrap;
+  gap: var(--pcr-space-1);
+}
+
+.pcr-observation-list {
+  gap: var(--pcr-space-1);
+  color: var(--pcr-muted-foreground);
+  font-size: var(--pcr-font-size-xs);
+}
+
+/* Lineage tree --------------------------------------------------------------- */
+
+.pcr-tree-row {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: var(--pcr-space-2);
+  width: 100%;
+  min-height: var(--pcr-touch-target);
+  padding: var(--pcr-space-2);
+  border: 0.0625rem solid transparent;
+  border-radius: var(--pcr-radius-sm);
+  background: transparent;
+  color: inherit;
+  cursor: pointer;
+}
+
+.pcr-tree li[data-depth="1"] .pcr-tree-row {
+  padding-left: var(--pcr-space-5);
+}
+
+.pcr-tree-row[aria-current="true"] {
+  border-color: var(--pcr-border);
+  background: var(--pcr-muted);
+}
+
+.pcr-tree-state,
+.pcr-tree-empty {
+  color: var(--pcr-muted-foreground);
+  font-size: var(--pcr-font-size-xs);
+}
+
+.pcr-state-dot {
+  display: inline-block;
+  width: var(--pcr-space-2);
+  height: var(--pcr-space-2);
+  border-radius: 999rem;
+  background: var(--pcr-muted-foreground);
+}
+
+.pcr-state-dot[data-state="running"] {
+  background: var(--pcr-accent);
+}
+
+.pcr-state-dot[data-state="completed"] {
+  background: var(--pcr-success);
+}
+
+.pcr-state-dot[data-state="failed"] {
+  background: var(--pcr-danger);
+}
+
+/* Conversation --------------------------------------------------------------- */
+
+.pcr-conversation {
+  position: relative;
+}
+
+.pcr-conversation-viewport {
+  max-height: var(--pcr-transcript-height);
+  overflow-y: auto;
+  padding: var(--pcr-space-4);
+  background: var(--pcr-card);
+  border: 0.0625rem solid var(--pcr-border);
+  border-radius: var(--pcr-radius-md);
+}
+
+.pcr-jump-to-latest {
+  position: absolute;
+  bottom: var(--pcr-space-3);
+  left: 50%;
+  translate: -50% 0;
+  z-index: var(--pcr-z-banner);
+  min-height: var(--pcr-touch-target);
+  padding-inline: var(--pcr-space-4);
+  border: 0.0625rem solid var(--pcr-border);
+  border-radius: 999rem;
+  background: var(--pcr-card);
+  color: var(--pcr-foreground);
+  cursor: pointer;
+}
+
+.pcr-empty-transcript {
+  display: grid;
+  gap: var(--pcr-space-2);
+  padding-block: var(--pcr-space-6);
+}
+
+.pcr-empty-transcript h3 {
+  font-size: var(--pcr-font-size-md);
+}
+
+.pcr-empty-transcript p:last-child {
+  color: var(--pcr-muted-foreground);
+}
+
+.pcr-transcript {
+  gap: var(--pcr-space-3);
+}
+
+.pcr-message {
+  display: grid;
+  gap: var(--pcr-space-1);
+  padding: var(--pcr-space-3);
+  border: 0.0625rem solid var(--pcr-border);
+  border-radius: var(--pcr-radius-md);
+  background: var(--pcr-surface-raised);
+}
+
+.pcr-message[data-role="user"] {
+  margin-left: var(--pcr-space-10);
+  background: var(--pcr-muted);
+}
+
+.pcr-message[data-state="failed"] {
+  border-color: var(--pcr-danger);
+  background: var(--pcr-danger-surface);
+  color: var(--pcr-danger);
+}
+
+.pcr-message[data-state="interrupted"] {
+  border-color: var(--pcr-warning);
+}
+
+.pcr-message-role {
+  color: var(--pcr-muted-foreground);
+  font-size: var(--pcr-font-size-xs);
+  font-weight: var(--pcr-weight-semibold);
+  letter-spacing: 0.08em;
+  text-transform: uppercase;
+}
+
+.pcr-message-text {
+  white-space: pre-wrap;
+}
+
+.pcr-message-divider {
+  padding-top: var(--pcr-space-2);
+  border-top: 0.0625rem solid var(--pcr-warning);
+  color: var(--pcr-warning);
+  font-size: var(--pcr-font-size-xs);
+}
+
+.pcr-stream-cursor {
+  display: inline-block;
+  width: var(--pcr-space-2);
+  height: var(--pcr-font-size-md);
+  margin-left: var(--pcr-space-1);
+  background: var(--pcr-accent);
+  vertical-align: text-bottom;
+  animation: pcr-pulse 1s steps(2, end) infinite;
+}
+
+@keyframes pcr-pulse {
+  50% {
+    opacity: 0.2;
+  }
+}
+
+.pcr-turn-marker {
+  display: flex;
+  align-items: center;
+  gap: var(--pcr-space-2);
+  padding-block: var(--pcr-space-2);
+  border-top: 0.0625rem solid var(--pcr-border);
+  color: var(--pcr-muted-foreground);
+  font-size: var(--pcr-font-size-xs);
+}
+
+.pcr-steering-chip {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: var(--pcr-space-2);
+  padding: var(--pcr-space-2);
+  border: 0.0625rem dashed var(--pcr-border);
+  border-radius: var(--pcr-radius-sm);
+  font-size: var(--pcr-font-size-xs);
+}
+
+/* Disclosures ---------------------------------------------------------------- */
+
+.pcr-disclosure {
+  padding: var(--pcr-space-2) var(--pcr-space-3);
+  border: 0.0625rem solid var(--pcr-border);
+  border-radius: var(--pcr-radius-md);
+  background: var(--pcr-surface-raised);
+}
+
+.pcr-disclosure-summary {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: var(--pcr-space-2);
+  min-height: var(--pcr-touch-target);
+  cursor: pointer;
+  font-weight: var(--pcr-weight-medium);
+}
+
+.pcr-disclosure-preview,
+.pcr-disclosure-label {
+  color: var(--pcr-muted-foreground);
+  font-size: var(--pcr-font-size-xs);
+  font-weight: var(--pcr-weight-semibold);
+}
+
+.pcr-disclosure-preview {
+  overflow: hidden;
+  min-width: 0;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.pcr-payload {
+  max-height: var(--pcr-transcript-height);
+  margin: var(--pcr-space-2) 0 0;
+  overflow: auto;
+  padding: var(--pcr-space-3);
+  border-radius: var(--pcr-radius-sm);
+  background: var(--pcr-muted);
+  font-family: var(--pcr-font-mono);
+  font-size: var(--pcr-font-size-xs);
+  white-space: pre-wrap;
+  word-break: break-word;
+}
+
+.pcr-payload--danger {
+  background: var(--pcr-danger-surface);
+  color: var(--pcr-danger);
+}
+
+/* Request cards -------------------------------------------------------------- */
+
+.pcr-request {
+  display: grid;
+  gap: var(--pcr-space-2);
+  padding: var(--pcr-space-3);
+  border: 0.0625rem solid var(--pcr-border);
+  border-left: var(--pcr-space-1) solid var(--pcr-accent);
+  border-radius: var(--pcr-radius-md);
+  background: var(--pcr-card);
+}
+
+.pcr-request--settled {
+  border-left-color: var(--pcr-border);
+  background: var(--pcr-surface-raised);
+}
+
+.pcr-request[data-status="resolved"] {
+  border-left-color: var(--pcr-success);
+}
+
+.pcr-request-header,
+.pcr-request-summary,
+.pcr-request-actions,
+.pcr-request-meta {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: var(--pcr-space-2);
+}
+
+.pcr-request-summary {
+  justify-content: space-between;
+  min-height: var(--pcr-touch-target);
+  cursor: pointer;
+}
+
+.pcr-request-kind {
+  font-weight: var(--pcr-weight-semibold);
+}
+
+.pcr-request-meta,
+.pcr-request-resolving {
+  color: var(--pcr-muted-foreground);
+  font-family: var(--pcr-font-mono);
+  font-size: var(--pcr-font-size-xs);
+}
+
+.pcr-request-input {
+  display: grid;
+  gap: var(--pcr-space-1);
+}
+
+.pcr-request-input input {
+  min-height: var(--pcr-control-height);
+  padding: var(--pcr-space-2) var(--pcr-space-3);
+  border: 0.0625rem solid var(--pcr-border);
+  border-radius: var(--pcr-radius-sm);
+  background: var(--pcr-card);
+  color: var(--pcr-card-foreground);
+}
+
+.pcr-request-actions .pcr-button {
+  min-height: var(--pcr-touch-target);
+}
+
+/* Composer ------------------------------------------------------------------- */
+
+.pcr-composer-region {
+  display: grid;
+  gap: var(--pcr-space-2);
+}
+
+.pcr-composer {
+  display: grid;
+  gap: var(--pcr-space-2);
+  padding: var(--pcr-space-3);
+  border: 0.0625rem solid var(--pcr-border);
+  border-radius: var(--pcr-radius-md);
+  background: var(--pcr-card);
+}
+
+.pcr-composer[data-state="active-turn"] {
+  border-color: var(--pcr-accent);
+}
+
+.pcr-composer-input {
+  width: 100%;
+  padding: var(--pcr-space-3);
+  border: 0.0625rem solid var(--pcr-border);
+  border-radius: var(--pcr-radius-sm);
+  background: var(--pcr-card);
+  color: var(--pcr-card-foreground);
+  resize: none;
+}
+
+.pcr-composer-actions {
+  display: grid;
+  gap: var(--pcr-space-2);
+}
+
+.pcr-composer-hint,
+.pcr-composer-reason,
+.pcr-menu-reason,
+.pcr-capability-diagnostic {
+  color: var(--pcr-muted-foreground);
+  font-size: var(--pcr-font-size-xs);
+}
+
+.pcr-composer-reason,
+.pcr-capability-diagnostic {
+  color: var(--pcr-warning);
+}
+
+.pcr-composer-buttons {
+  display: flex;
+  justify-content: flex-end;
+  gap: var(--pcr-space-3);
+}
+
+.pcr-composer-buttons .pcr-button {
+  min-width: var(--pcr-touch-target);
+  min-height: var(--pcr-touch-target);
+}
+
+/* Banners, menus, dialogs, tooltips ----------------------------------------- */
+
+.pcr-banner {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  justify-content: space-between;
+  gap: var(--pcr-space-3);
+  z-index: var(--pcr-z-banner);
+  padding: var(--pcr-space-3);
+  border: 0.0625rem solid var(--pcr-border);
+  border-radius: var(--pcr-radius-md);
+  background: var(--pcr-muted);
+  transition: opacity var(--pcr-motion-medium) ease;
+}
+
+.pcr-banner[data-tone="accent"],
+.pcr-banner[data-tone="info"] {
+  border-color: var(--pcr-accent);
+  background: var(--pcr-accent-surface);
+  color: var(--pcr-accent);
+}
+
+.pcr-banner[data-tone="success"] {
+  border-color: var(--pcr-success);
+  background: var(--pcr-success-surface);
+  color: var(--pcr-success);
+}
+
+.pcr-banner[data-tone="warning"] {
+  border-color: var(--pcr-warning);
+  background: var(--pcr-warning-surface);
+  color: var(--pcr-warning);
+}
+
+.pcr-banner[data-tone="danger"] {
+  border-color: var(--pcr-danger);
+  background: var(--pcr-danger-surface);
+  color: var(--pcr-danger);
+}
+
+.pcr-banner-actions {
+  display: flex;
+  gap: var(--pcr-space-2);
+}
+
+.pcr-menu {
+  position: relative;
+}
+
+.pcr-menu-list {
+  position: absolute;
+  right: 0;
+  z-index: var(--pcr-z-banner);
+  display: grid;
+  gap: var(--pcr-space-1);
+  min-width: var(--pcr-rail-width);
+  padding: var(--pcr-space-2);
+  border: 0.0625rem solid var(--pcr-border);
+  border-radius: var(--pcr-radius-md);
+  background: var(--pcr-card);
+  box-shadow: var(--pcr-shadow-sm);
+}
+
+.pcr-menu-item {
+  min-height: var(--pcr-touch-target);
+  padding: var(--pcr-space-2);
+  border: 0;
+  border-radius: var(--pcr-radius-sm);
+  background: transparent;
+  color: inherit;
+  text-align: left;
+  cursor: pointer;
+}
+
+.pcr-menu-item[aria-disabled="true"] {
+  color: var(--pcr-muted-foreground);
+  cursor: not-allowed;
+}
+
+.pcr-menu-item:hover:not([aria-disabled="true"]) {
+  background: var(--pcr-muted);
+}
+
+.pcr-dialog {
+  z-index: var(--pcr-z-dialog);
+  max-width: var(--pcr-center-width);
+  padding: 0;
+  border: 0.0625rem solid var(--pcr-border);
+  border-radius: var(--pcr-radius-md);
+  background: var(--pcr-card);
+  color: var(--pcr-card-foreground);
+}
+
+.pcr-dialog-body {
+  display: grid;
+  gap: var(--pcr-space-3);
+  padding: var(--pcr-space-5);
+}
+
+.pcr-dialog-title {
+  font-size: var(--pcr-font-size-lg);
+  font-weight: var(--pcr-weight-semibold);
+}
+
+.pcr-dialog-description {
+  color: var(--pcr-muted-foreground);
+}
+
+.pcr-dialog-input {
+  width: 100%;
+  padding: var(--pcr-space-3);
+  border: 0.0625rem solid var(--pcr-border);
+  border-radius: var(--pcr-radius-sm);
+  background: var(--pcr-card);
+  color: var(--pcr-card-foreground);
+}
+
+.pcr-dialog-footer {
+  display: flex;
+  justify-content: flex-end;
+  gap: var(--pcr-space-3);
+}
+
+.pcr-tooltip {
+  position: relative;
+}
+
+.pcr-tooltip-content {
+  position: absolute;
+  left: 0;
+  top: 100%;
+  z-index: var(--pcr-z-banner);
+  display: none;
+  min-width: var(--pcr-rail-width);
+  padding: var(--pcr-space-2);
+  border: 0.0625rem solid var(--pcr-border);
+  border-radius: var(--pcr-radius-sm);
+  background: var(--pcr-card);
+  font-size: var(--pcr-font-size-xs);
+}
+
+.pcr-tooltip:hover .pcr-tooltip-content,
+.pcr-tooltip:focus-within .pcr-tooltip-content {
+  display: block;
+}
+
+/* Tabs and inspector --------------------------------------------------------- */
+
+.pcr-tabs {
+  display: grid;
+  gap: var(--pcr-space-3);
+}
+
+.pcr-tablist {
+  display: flex;
+  flex-wrap: wrap;
+  gap: var(--pcr-space-1);
+  padding: var(--pcr-space-1);
+  border: 0.0625rem solid var(--pcr-border);
+  border-radius: var(--pcr-radius-sm);
+  background: var(--pcr-muted);
+}
+
+.pcr-tab {
+  min-height: var(--pcr-touch-target);
+  padding-inline: var(--pcr-space-3);
+  border: 0;
+  border-radius: var(--pcr-radius-sm);
+  background: transparent;
+  color: var(--pcr-muted-foreground);
+  cursor: pointer;
+}
+
+.pcr-tab[aria-selected="true"] {
+  background: var(--pcr-card);
+  color: var(--pcr-foreground);
+  font-weight: var(--pcr-weight-semibold);
+}
+
+.pcr-inspector-events {
+  display: grid;
+  gap: var(--pcr-space-2);
+}
+
+.pcr-inspector-filter {
+  width: 100%;
+  min-height: var(--pcr-control-height);
+  padding: var(--pcr-space-2) var(--pcr-space-3);
+  border: 0.0625rem solid var(--pcr-border);
+  border-radius: var(--pcr-radius-sm);
+  background: var(--pcr-card);
+  color: var(--pcr-card-foreground);
+}
+
+.pcr-facets {
+  display: flex;
+  flex-wrap: wrap;
+  gap: var(--pcr-space-1);
+  max-height: var(--pcr-facet-height);
+  overflow-y: auto;
+  padding-bottom: var(--pcr-space-1);
+}
+
+.pcr-facet,
+.pcr-chip,
+.pcr-copy {
+  min-height: var(--pcr-space-6);
+  padding-inline: var(--pcr-space-2);
+  border: 0.0625rem solid var(--pcr-border);
+  border-radius: 999rem;
+  background: var(--pcr-card);
+  color: var(--pcr-muted-foreground);
+  font-size: var(--pcr-font-size-xs);
+  cursor: pointer;
+}
+
+.pcr-facet[aria-pressed="true"] {
+  border-color: var(--pcr-accent);
+  background: var(--pcr-accent-surface);
+  color: var(--pcr-accent);
+}
+
+.pcr-inspector-list {
+  max-height: var(--pcr-transcript-height);
+  overflow-y: auto;
+}
+
+.pcr-inspector-list li[data-highlighted="true"] {
+  background: var(--pcr-accent-surface);
+}
+
+.pcr-inspector-row {
+  display: grid;
+  grid-template-columns: var(--pcr-timeline-column) minmax(0, 1fr) minmax(0, 1fr);
+  gap: var(--pcr-space-2);
+  align-items: center;
+  min-height: var(--pcr-touch-target);
+  cursor: pointer;
+  font-family: var(--pcr-font-mono);
+  font-size: var(--pcr-font-size-xs);
+}
+
+.pcr-inspector-id {
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.pcr-seq {
+  color: var(--pcr-muted-foreground);
+}
+
+.pcr-inspector-grid {
+  display: grid;
+  grid-template-columns: minmax(0, 1fr);
+  gap: var(--pcr-space-3);
+  margin: 0;
+  min-width: 0;
+}
+
+.pcr-capability-list {
+  display: grid;
+  gap: var(--pcr-space-2);
+  margin: 0;
+  padding: 0;
+  list-style: none;
+}
+
+.pcr-capability-list li {
+  display: grid;
+  grid-template-columns: minmax(0, 1fr) auto;
+  gap: var(--pcr-space-2);
+  align-items: center;
+  padding-block: var(--pcr-space-2);
+  border-bottom: 0.0625rem solid var(--pcr-border);
+}
+
+.pcr-capability-list p {
+  grid-column: 1 / -1;
+}
+
+.pcr-replay-stepper {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: var(--pcr-space-3);
+  padding: var(--pcr-space-3);
+  border: 0.0625rem solid var(--pcr-warning);
+  border-radius: var(--pcr-radius-md);
+  background: var(--pcr-warning-surface);
+}
+
+.pcr-goal-banner {
+  display: grid;
+  gap: var(--pcr-space-2);
+}
+
+.pcr-goal-empty {
+  color: var(--pcr-muted-foreground);
+  font-size: var(--pcr-font-size-xs);
+}
+
+.pcr-transcript li[data-highlighted="true"] {
+  outline: 0.125rem solid var(--pcr-accent);
+  outline-offset: 0.125rem;
+}
+
+.pcr-tab:focus-visible,
+.pcr-menu-item:focus-visible,
+.pcr-tree-row:focus-visible,
+.pcr-manifest-row:focus-visible,
+.pcr-facet:focus-visible,
+.pcr-chip:focus-visible,
+.pcr-copy:focus-visible,
+.pcr-jump-to-latest:focus-visible,
+.pcr-request:focus-visible,
+.pcr-conversation-viewport:focus-visible,
+.pcr-composer-input:focus-visible,
+.pcr-inspector-filter:focus-visible,
+.pcr-dialog-input:focus-visible,
+.pcr-request-input input:focus-visible,
+.pcr-tabpanel:focus-visible,
+.pcr-root summary:focus-visible {
+  outline: 0.125rem solid var(--pcr-ring);
+  outline-offset: 0.125rem;
+}
+
+@media (max-width: 56.25rem) {
+  .pcr-message[data-role="user"] {
+    margin-left: var(--pcr-space-5);
+  }
+}
+
+@media (prefers-reduced-motion: reduce) {
+  .pcr-root {
+    --pcr-motion-medium: 0ms;
+  }
+
+  .pcr-stream-cursor {
+    animation: none;
+  }
+}
diff --git a/packages/paperclip-runner/test-fixtures/forbidden-sdk-consumer/examples/mini-consumer/deep-import.ts b/packages/paperclip-runner/test-fixtures/forbidden-sdk-consumer/examples/mini-consumer/deep-import.ts
new file mode 100644
index 00000000000..20ef1765706
--- /dev/null
+++ b/packages/paperclip-runner/test-fixtures/forbidden-sdk-consumer/examples/mini-consumer/deep-import.ts
@@ -0,0 +1,3 @@
+import { useRunnerConsole } from "../../../../src/react/use-runner-console";
+
+void useRunnerConsole;
diff --git a/packages/paperclip-runner/tsconfig.browser.json b/packages/paperclip-runner/tsconfig.browser.json
index 81f66f96486..06f51856d6a 100644
--- a/packages/paperclip-runner/tsconfig.browser.json
+++ b/packages/paperclip-runner/tsconfig.browser.json
@@ -6,7 +6,18 @@
     "module": "ESNext",
     "moduleResolution": "Bundler",
     "rootDir": ".",
-    "types": ["vite/client"]
+    "types": ["vite/client", "node"],
+    "baseUrl": ".",
+    "paths": {
+      "@paperclipai/paperclip-runner/browser": ["src/browser/index.ts"],
+      "@paperclipai/paperclip-runner/react": ["src/react/index.ts"],
+      "@paperclipai/paperclip-runner/styles.css": ["styles.css"]
+    }
   },
-  "include": ["devtools/browser/src/**/*.ts", "devtools/browser/src/**/*.tsx"]
+  "include": [
+    "devtools/browser/src/**/*.ts",
+    "devtools/browser/src/**/*.tsx",
+    "examples/*/src/**/*.ts",
+    "examples/*/src/**/*.tsx"
+  ]
 }
diff --git a/packages/paperclip-runner/tsconfig.json b/packages/paperclip-runner/tsconfig.json
index 8635ab2db4e..53e9de884d4 100644
--- a/packages/paperclip-runner/tsconfig.json
+++ b/packages/paperclip-runner/tsconfig.json
@@ -1,9 +1,11 @@
 {
   "extends": "../../tsconfig.base.json",
   "compilerOptions": {
+    "jsx": "react-jsx",
+    "lib": ["ES2023", "DOM", "DOM.Iterable"],
     "outDir": "dist",
     "rootDir": "src"
   },
-  "include": ["src/**/*.ts"],
-  "exclude": ["src/**/*.test.ts"]
+  "include": ["src/**/*.ts", "src/**/*.tsx"],
+  "exclude": ["src/**/*.test.ts", "src/**/*.test.tsx"]
 }
diff --git a/packages/paperclip-runner/vite.phase5.config.ts b/packages/paperclip-runner/vite.phase5.config.ts
new file mode 100644
index 00000000000..15a742cae3d
--- /dev/null
+++ b/packages/paperclip-runner/vite.phase5.config.ts
@@ -0,0 +1,34 @@
+import { resolve } from "node:path";
+import { fileURLToPath } from "node:url";
+
+import react from "@vitejs/plugin-react";
+import { defineConfig } from "vite";
+
+import { phase4bBrowserServerPlugin } from "./scripts/phase4b-browser-server.mjs";
+
+const packageRoot = fileURLToPath(new URL(".", import.meta.url));
+
+export default defineConfig({
+  root: resolve(packageRoot, "examples"),
+  plugins: [react(), phase4bBrowserServerPlugin()],
+  resolve: {
+    alias: [
+      { find: "@paperclipai/paperclip-runner/browser", replacement: resolve(packageRoot, "src/browser/index.ts") },
+      { find: "@paperclipai/paperclip-runner/react", replacement: resolve(packageRoot, "src/react/index.ts") },
+      { find: "@paperclipai/paperclip-runner/styles.css", replacement: resolve(packageRoot, "styles.css") },
+    ],
+  },
+  server: { host: "127.0.0.1" },
+  preview: { host: "127.0.0.1" },
+  build: {
+    outDir: resolve(packageRoot, "dist-phase5"),
+    emptyOutDir: true,
+    target: "esnext",
+    rollupOptions: {
+      input: {
+        reference: resolve(packageRoot, "examples/reference-console/index.html"),
+        mini: resolve(packageRoot, "examples/mini-consumer/index.html"),
+      },
+    },
+  },
+});
diff --git a/packages/paperclip-runner/vitest.config.ts b/packages/paperclip-runner/vitest.config.ts
index b8052bb7263..d430a45c5d2 100644
--- a/packages/paperclip-runner/vitest.config.ts
+++ b/packages/paperclip-runner/vitest.config.ts
@@ -5,6 +5,7 @@ export default defineConfig({
     environment: "node",
     include: [
       "src/**/*.test.ts",
+      "src/**/*.test.tsx",
       "devtools/browser/src/**/*.test.ts",
       "scripts/phase2-browser-server.test.mjs",
       "scripts/phase4b-browser-server.test.mjs",