## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work. > - The runner package already provides the production protocol and execution spine. > - Contributors still need stable SDK surfaces, deterministic test tools, and local inspection tools. > - Those surfaces share generated contracts and must change as one package boundary. > - This pull request adds the package-local SDK, labs, examples, and drift checks. > - The benefit is a reviewable developer platform that does not change application execution selection. ## Linked Issues or Issue Description **Subsystem affected** `packages/paperclip-runner` — runner SDK, conformance tools, and developer tooling. **Problem or motivation** The production runner spine is present, but package consumers cannot build deterministic integrations, inspect sessions, or verify provider-neutral behavior through supported surfaces. **Proposed solution** Add browser, React, standalone, live-session, scenario, conformance, and evaluation surfaces. Add generated contract inventories and package-local verification scripts. Keep production application routing unchanged. **Alternatives considered** We considered splitting each generated catalog, SDK surface, and demo into separate pull requests. Those changes share exports, fixtures, and drift gates. Splitting them would create intermediate package states that do not build. **Roadmap alignment** No overlapping item appears in `ROADMAP.md`. This work extends the runner package that is already on `master`. ## What Changed - Add browser, React, standalone, live-session, and issue-thread SDK surfaces. - Add deterministic mock control-plane, scenario, conformance, replay, and evaluation tools. - Add bounded Codex, OpenCode, and ACPX development transports and fixtures. - Keep deferred managed-provider execution fail-closed. Persisted compatibility data remains readable. - Add generated capability inventories with their source files and drift checks. - Add examples, package documentation, browser checks, and clean-consumer checks. - Preserve the reviewed protocol bounds, replay compatibility aliases, process environment isolation, and semantic redaction limits. - Update the ACPX package patch that the existing workspace patch registry already tracks. - Do not change `pnpm-lock.yaml`, repository workflows, server runtime selection, or the application UI. ## Verification GitHub Actions is the verification authority for this pull request. The repository CI, package TypeScript and Rust checks, package tests, generated-output drift checks, browser checks, security scans, and Greptile review must pass on the exact head. Local test suites were not run because this series uses parallel GitHub Actions for verification. ## Risks This is a large greenfield package change. The main risks are public export drift, generated-output drift, and optional React consumer compatibility. Package boundary checks, clean-consumer checks, and browser tests cover those risks. Production adapter selection and server execution are outside this pull request. ## Stack 1. **This PR:** runner SDK and developer tooling. 2. [Codex production server integration](https://github.com/paperclipai/paperclip/pull/12616). 3. [Provider-neutral task-thread UI](https://github.com/paperclipai/paperclip/pull/12617). ## Model Used OpenAI Codex, GPT-5, high-reasoning mode, with tool use and code execution. ## Checklist - [x] I have included a thinking path that traces from project context to this change - [x] I have specified the model used (with version and capability details) - [x] I have checked ROADMAP.md and confirmed this PR does not duplicate planned core work - [x] I have searched GitHub for duplicate or related PRs and linked them above - [x] I have described the issue in-PR following the feature request template - [x] I have not referenced internal/instance-local Paperclip issues or links - [x] My branch name describes the change and contains no internal Paperclip ticket id - [ ] I have run tests locally and they pass - [x] I have added or updated tests where applicable - [x] I have updated relevant documentation to reflect my changes - [x] I have considered and documented risks above - [ ] All Paperclip CI gates are green - [ ] Greptile is 5/5 with no open P2s, recommendations, or follow-ups - [x] I will address all Greptile and reviewer comments before requesting merge
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Standalone Standalone Adapter Demo
Standalone currently proves the thin adapter boundary as a standalone package demo.
It does not install or enable the runner in a Paperclip instance. All active
implementation, documentation, tutorial, and evidence work remains under
packages/paperclip-runner/.
Selection and rollback
The standalone resolver has two inputs:
- the native demo feature flag, which defaults off;
- the kill switch, which always resolves to legacy.
The default path is legacy. Native mode is selected only when the demo flag is
enabled and the kill switch is disabled. Both paths use the public
ControlPlanePort contract and the canonical PRP reducer.
# Default legacy path
pnpm --filter @paperclipai/paperclip-runner trace:standalone
# Native standalone path
pnpm --filter @paperclipai/paperclip-runner trace:standalone -- --feature-flag enabled
# Kill-switch rollback
pnpm --filter @paperclipai/paperclip-runner trace:standalone -- --feature-flag enabled --kill-switch enabled
Standalone page
Run:
pnpm --filter @paperclipai/paperclip-runner demo:standalone
Then open http://127.0.0.1:4182/standalone-demo/. The page exposes mode
selection, contract conformance, reducer projection, replay, finalization, and
native/legacy invocation counters. It makes no network call to Paperclip.
Verified boundary
The package-local tracer verifies:
- identical public-port conformance for the selected demo adapter;
- ordered replay with duplicate idempotency and mutation rejection;
- canonical reducer projection through terminal success;
- idempotent result and terminal finalization;
- legacy default behavior and deterministic kill-switch rollback.
Company auth, budgets, approvals, audit, workspaces, and product persistence are not claimed by this standalone checkpoint. Testing those concerns in a real Paperclip instance remains outside this package and requires a separately reviewed integration.
See the runnable tutorial.