diff --git a/maps/agent-access-map/agents.md b/maps/agent-access-map/agents.md
index f579d431b41..1d053c34f6b 100644
--- a/maps/agent-access-map/agents.md
+++ b/maps/agent-access-map/agents.md
@@ -9,6 +9,12 @@ Each capability needs operation-level review before its entire scope can be
 qualified. No live agent execution is claimed. Follow the [map contract](../README.md)
 for format, permission checks, evidence and maintenance.
 
+Scoped runner-default source review: 2026-10-12 at
+`eee0534154eaf5d0d3f2bbc97c1e24d86f34a5a5`, limited to creation/configuration,
+approval activation, built-in provisioning and import preservation described
+below. The original baseline commit above still governs unrelated entries; this
+update does not claim operation-complete review or live agent verification.
+
 ## `hire`
 
 Review: `baseline`.
@@ -30,17 +36,45 @@ bypass hiring authorization. Source: [runner resolver](../../server/src/services
 Policy: Agent creation/configuration uses action grants, resource policies and change
 consent; some controls require a board actor.
 
+The creation boundary resolves the request-level runner before adapter validation
+and credential normalization. Omitted/automatic new Codex selection uses the
+qualified target's default; explicit Legacy is retained. Disabled adapters and
+external overrides affect new selection, while missing credentials/runtime or
+incompatible settings remain errors. Existing agents and reviewed pending hires
+retain their recorded execution. Native `hire_agent` explicitly inherits its
+caller's runtime and remains subject to permission and credential restrictions;
+it is not an arbitrary host-configuration or login tool. REST/CLI creation and
+hire runner options use the [shared request contract](../../packages/shared/src/validators/agent.ts).
+
 Evidence: `source-only` — [implementation](../../server/src/routes/agents.ts#L1395) at
 the reviewed commit above.
 
+Scoped Evidence: `source-only` — [creation policy](../../server/src/services/agent-hiring.ts),
+[runner resolution](../../server/src/services/agent-runner-selection.ts),
+[native hire binding](../../server/src/services/native-runtime/paperclip-runner-tool-authority.ts),
+[frozen approval activation](../../server/src/modules/agent-lifecycle/adapters/approvals.ts)
+and [same-harness import preservation](../../server/src/services/company-portability.ts)
+at the scoped commit. No permitted-agent journey was executed for this map update.
+
 Verification: `not-run` — exercise a listed permitted operation with actual agent
 credentials/run context; inspect its result and applicable persistence/attribution.
 Assert the relevant denied actor, owner, company or mode from Policy. Review the
 remaining operations before qualifying the whole capability.
 
+For this scope, compare automatic and explicit Legacy creation, assert foreign
+company/environment and missing-grant denials, then compare pending approval
+configuration across restart and activation. An unrelated edit/import update must
+not change existing execution; a new package without a runner choice receives
+creation defaults. Do not count a board call or component test as agent evidence.
+
 Gaps: Identity/persona hiring works. Operator account login and sensitive
 adapter/environment configuration are separate guarded actions.
 
+The runner request does not grant new account, environment-probe or native API
+fallback authority; see [validation access](./runs-adapters.md#validation) and
+[environment administration](./execution-environments.md#probe). Full access
+qualification remains not run.
+
 ## `instructions`
 
 Review: `baseline`.
@@ -144,3 +178,10 @@ remaining operations before qualifying the whole capability.
 
 Gaps: Provisioning checks agents:create. Enabling/running its built-in routine is not
 the same permission path.
+
+Scoped source review: [built-in provisioning](../../server/src/services/built-in-agents.ts)
+recognizes the underlying Codex harness of a native company agent. New configured
+provisioning resolves the runner, while unrelated reconciliation and same-harness
+edits retain existing execution. Verify explicit runner changes preserve compatible
+saved settings; the general creation/access policy above still applies. This is
+source-only evidence at the scoped commit, not a live provisioning result.
diff --git a/maps/agent-access-map/execution-environments.md b/maps/agent-access-map/execution-environments.md
index 74860af970f..5c2b2583167 100644
--- a/maps/agent-access-map/execution-environments.md
+++ b/maps/agent-access-map/execution-environments.md
@@ -10,6 +10,12 @@ Each capability needs operation-level review before its entire scope can be
 qualified. No live agent execution is claimed. Follow the [map contract](../README.md)
 for format, permission checks, evidence and maintenance.
 
+Scoped immutable-platform source review: 2026-10-12 at
+`d16eccf109b524778ceb896f79ccb3881bc61a9b`, limited to saved sandbox probing,
+server-owned qualification metadata and read/invalidation behavior. The original
+baseline commit and review depth remain for unrelated operations; no live agent
+or provider qualification is claimed by this update.
+
 ## `configuration`
 
 Review: `baseline`.
@@ -34,6 +40,18 @@ own policy and access review.
 Gaps: API exists; an agent cannot use instance environment management as an ordinary
 company actor.
 
+Scoped source review: [environment routes](../../server/src/routes/environments.ts)
+require board organization access for reads and local-implicit board or instance
+administrator for management. Create/PATCH reject client-supplied platform-proof
+metadata; [service updates](../../server/src/services/environments.ts) discard
+supplied proof, preserve current server proof atomically for metadata-only edits,
+and invalidate it when the target configuration or driver changes. Public row
+responses hide the private record. This is source-only at the scoped commit.
+Verify forged metadata rejection, concurrent probe/update preservation, target
+invalidation and restricted-reader redaction; actual agent-denial proof remains
+not run. Company/team packages do not import or export environment rows, so those
+packages do not transfer platform qualification.
+
 ## `capabilities`
 
 Review: `baseline`.
@@ -73,6 +91,15 @@ Agent access: `restricted` — Board/admin probes / CLI environment.
 Policy: Environment management is instance administrator/board; permitted assignment
 uses agent/project policy.
 
+Both probe endpoints require a board actor that is local-implicit or an instance
+administrator; ordinary agent identity and company membership alone are denied.
+The saved sandbox probe also resolves company/environment and secret access
+before allocating a fresh lease. Its measurement is company-bound to an immutable
+image digest, effective provider configuration and active custom-image identity;
+only confirmed cleanup permits recording it. A draft probe does not record saved
+qualification. Reading stored qualification does not lease/provision a target and
+does not grant an agent permission to probe or manage that target.
+
 Evidence: `source-only` — [implementation](../../server/src/routes/environments.ts#L353)
 at the reviewed commit above.
 
@@ -82,6 +109,24 @@ own policy and access review.
 
 Gaps: Reachability probes are not granted by an agent's right to execute assigned work.
 
+Scoped Evidence: `source-only` — [probe authorization](../../server/src/routes/environments.ts),
+[immutable binding, measurement and read](../../server/src/services/environment-probe.ts),
+[private metadata writes](../../server/src/services/environments.ts) and
+[custom-image binding](../../server/src/services/environment-custom-image-runtime.ts)
+at the scoped commit. A connection-only success or a fixture cannot certify
+native compatibility, account authentication or agent access.
+
+Scoped Verification: `not-run` — on one authorized owned target, compare pinned
+image proof with mutable/snapshot and changed-config controls; require independent
+cleanup evidence before recording proof. Assert agent/non-admin board denial,
+secret-context denial where the actor lacks access and forged-proof rejection.
+Verify API reads hide the private record and metadata-only updates cannot overwrite it. Then use
+[runtime validation](./runs-adapters.md#validation) for account/model/native startup.
+
+There is no new delegated agent probe binding or client proof-write API. Any
+human-action request/result handoff requires its own admitted path and verification;
+an accepted interaction does not turn the caller into a board administrator.
+
 ## `assignment`
 
 Review: `baseline`.
diff --git a/maps/agent-access-map/onboarding.md b/maps/agent-access-map/onboarding.md
index f4eb025f50c..c3c4f3429df 100644
--- a/maps/agent-access-map/onboarding.md
+++ b/maps/agent-access-map/onboarding.md
@@ -9,6 +9,11 @@ Each capability needs operation-level review before its entire scope can be
 qualified. No live agent execution is claimed. Follow the [map contract](../README.md)
 for format, permission checks, evidence and maintenance.
 
+Scoped runner-default source review: 2026-10-12 at
+`eee0534154eaf5d0d3f2bbc97c1e24d86f34a5a5`, limited to first-agent selection,
+selected-runtime validation and draft restoration. Unrelated baseline entries
+retain the original source commit; no live agent verification is added.
+
 ## `instance`
 
 Review: `baseline`.
@@ -74,10 +79,25 @@ provider-account/environment setup.
 Policy: Instance setup is operator work; company creation is board; agent creation/task
 creation retain their individual permissions.
 
+The wizard selects the Codex harness and lets the server resolve an automatic
+new-agent runner; explicit Legacy remains available. Supported-platform and
+immutable sandbox evidence follow [environment probe policy](./execution-environments.md#probe).
+Creation/discovery do not provision a target to determine this default. Adapter
+setup validation requires `agents:create`, plus saved-agent update access when
+testing an existing agent; interactive account login additionally requires a
+board user and owner-bound session. An agent's right to hire is not login or
+instance-environment administration authority.
+
 Evidence: `source-only` —
 [implementation](../../ui/src/components/OnboardingWizard.tsx#L279) at the reviewed
 commit above.
 
+Scoped Evidence: `source-only` — [wizard/default selection](../../ui/src/components/OnboardingWizard.tsx),
+[creation resolver](../../server/src/services/agent-runner-selection.ts) and
+[setup/login authorization](../../server/src/routes/agents.ts) at the scoped
+commit. Existing agent/approval execution preservation follows
+[hiring access](./agents.md#hire); no live onboarding proof is claimed here.
+
 Verification: `not-run` — exercise a listed permitted operation with actual agent
 credentials/run context; inspect its result and applicable persistence/attribution.
 Assert the relevant denied actor, owner, company or mode from Policy. Review the
@@ -86,6 +106,11 @@ remaining operations before qualifying the whole capability.
 Gaps: Account authorization, environment administration and model selection need
 separate checks.
 
+Verify automatic onboarding without a post-hire runner change, explicit Legacy,
+saved configuration after reload and the actual selected runtime's useful task
+plus follow-up. Assert denied agent login/probe and foreign-company account or
+environment access separately. These agent-context checks remain `not-run`.
+
 ## `first-task`
 
 Review: `baseline`.
@@ -134,3 +159,8 @@ evidence.
 
 Gaps: No server onboarding-draft API for this browser-local state; classify explicitly
 or intentionally make it a cross-client product feature.
+
+Scoped source review of [draft restoration](../../ui/src/components/OnboardingWizard.tsx)
+preserves harness/runner intent and invalidates obsolete setup-test results after
+a selection change. Browser draft continuity is not API or live-agent evidence,
+and opening a saved Legacy agent does not apply new-agent defaults.
diff --git a/maps/agent-access-map/runs-adapters.md b/maps/agent-access-map/runs-adapters.md
index de444886a96..5f069d79265 100644
--- a/maps/agent-access-map/runs-adapters.md
+++ b/maps/agent-access-map/runs-adapters.md
@@ -9,6 +9,11 @@ Each capability needs operation-level review before its entire scope can be
 qualified. No live agent execution is claimed. Follow the [map contract](../README.md)
 for format, permission checks, evidence and maintenance.
 
+Scoped runner-default source review: 2026-10-12 at
+`eee0534154eaf5d0d3f2bbc97c1e24d86f34a5a5`, limited to runner discovery,
+selected-runtime testing and saved execution/session preservation. The original
+baseline source and review depth remain unchanged for unrelated operations.
+
 ## `availability`
 
 Review: `baseline`.
@@ -40,6 +45,15 @@ Source: [adapter discovery](../../server/src/adapters/registry.ts).
 Gaps: Raw instance adapter listing requires board, while company model discovery exists
 for eligible agents.
 
+Scoped source-only evidence: [adapter discovery](../../server/src/routes/adapters.ts)
+reports supported runners/effective default for the selected company/environment;
+[selection policy](../../server/src/services/agent-runner-selection.ts) reads
+server-owned immutable sandbox facts without provisioning. New Codex defaults
+and explicit overrides follow the [shared runner contract](../../packages/shared/src/agent-runner.ts);
+other harness defaults remain unchanged. The board inventory does not grant a
+native agent an equivalent discovery binding. See
+[probe restrictions](./execution-environments.md#probe) for acquiring qualification.
+
 ## `validation`
 
 Review: `baseline`.
@@ -65,6 +79,22 @@ remaining operations before qualifying the whole capability.
 Gaps: Environment test path checks creation/configuration policy; missing provider auth
 must use its owner setup flow.
 
+Scoped source review: [test authorization and resolution](../../server/src/routes/agents.ts)
+requires same-company `agents:create`, saved-agent update access when supplied,
+allowed environment selection, and normal secret/responsible-user checks. An
+unchanged saved runner avoids new-creation policy but still receives selected
+runtime validation. [Native readiness](../../server/src/services/native-runtime/setup-readiness.ts)
+tests native Codex startup/model/account and bounded teardown; an authentication
+or Legacy CLI check cannot replace that runtime evidence. Missing dependencies,
+credentials, invalid models and incompatible settings fail without silently
+changing runners. Account login remains board/owner-bound.
+
+Verification for this scope remains `not-run`: use an admitted agent REST/CLI
+validation path, assert missing grants and cross-company targets/accounts are
+denied, then prove the useful task/follow-up separately. `hire_agent` inherits its
+caller's runtime; do not assume its binding accepts arbitrary runner or account
+settings. See [creation access](./agents.md#hire).
+
 ## `runs`
 
 Review: `baseline`.
@@ -114,3 +144,10 @@ own policy and access review.
 
 Gaps: Execution context reset is not a permitted generic native API mutation or an
 ordinary agent management path.
+
+Scoped source-only evidence: [configuration changes](../../server/src/services/agent-configuration.ts)
+and [native execution/recovery](../../server/src/services/native-runtime/native-session-executor.ts)
+retain existing execution on unrelated edits and use recorded run configuration
+for active/recovered runs. Explicit runner changes use revisions and session
+invalidation. Verify saved configuration, current versus historical run identity,
+restart and follow-up without granting session-reset authority to an agent.
diff --git a/maps/feature-map/agents.md b/maps/feature-map/agents.md
index 4f4e05529d7..ec1eb49ab7d 100644
--- a/maps/feature-map/agents.md
+++ b/maps/feature-map/agents.md
@@ -8,7 +8,7 @@ Agent access: [companion](../agent-access-map/agents.md).
 
 ## Sub-features
 
-- `hire`: choose identity, adapter, model, and required account settings; edit
+- `hire`: choose identity, harness, model, and required account settings; edit
   reporting relationships through the agent configuration afterward.
 - `instructions`: edit agent configuration and instruction files with durable revisions.
 - `organization`: inspect and change reporting relationships through supported controls.
@@ -39,6 +39,25 @@ Automated: [new agent page](../../ui/src/pages/NewAgent.test.tsx) and [configura
 
 Manual: Hire an agent with a distinct name and role. Complete any required approval, reload the roster, and open its configuration. Confirm manager, adapter, and model persisted; run a small task to prove execution readiness.
 
+For a new Codex hire, choose the Codex harness. Automatic selection uses Paperclip
+Runner on a qualified selected target; Advanced offers an explicit Legacy runner
+override. Record the persisted runner and
+underlying harness, rather than treating the displayed Codex name as execution
+proof. See [runtime selection and validation](./runs-adapters.md#adapter-setup)
+and [target qualification](./execution-environments.md#environment-settings).
+
+Repeat with an explicit Legacy Codex hire. If approval is required, compare its
+reviewed execution configuration before and after restart and activation; approval
+must retain the reviewed runner. Test an existing Legacy and native agent through
+an unrelated edit, reload and restart: neither is automatically upgraded.
+
+Creation defaults also apply to API/CLI hires, built-ins, plugins and new team
+imports. Exports preserve resolved execution choices; a package without a runner
+choice uses the new-agent default, while updating an existing same-harness agent
+preserves its execution. For a native Codex import, edit a model or account binding
+and verify unchanged runtime settings survive; an explicit clear must stay cleared.
+Use the [portability recipe](./companies.md) for package preparation and boundaries.
+
 For Claude Code on Apple Silicon, submit without a runner override and inspect
 saved configuration: `paperclip_runner`, `provider: acpx`, `acpxAgent: claude`,
 and ordinary model `claude-opus-5-5`. The Advanced runner selector can explicitly
@@ -58,6 +77,12 @@ Automated: [instruction service](../../server/src/__tests__/agent-instructions-s
 
 Manual: Save a harmless instruction edit, reload, and verify its revision and effect in the next eligible run. Pause and resume the disposable agent; confirm pause prevents new work and does not erase previous runs.
 
+An explicit runner change is a configuration change, with normal revisions and
+session invalidation. Incompatible settings must produce a field-specific error;
+selecting another runner must not silently discard them or change an active run's
+recorded execution. Keep runner choice in Advanced and verify the next eligible
+run separately from historical transcripts.
+
 ### `organization`
 
 Automated: [org chart](../../ui/src/pages/OrgChart.test.tsx) is component evidence. Built-in setup also has [configuration modal tests](../../ui/src/components/ConfigureBuiltInAgentModal.test.tsx).
diff --git a/maps/feature-map/execution-environments.md b/maps/feature-map/execution-environments.md
index bb1fa10d78f..dda710a1d89 100644
--- a/maps/feature-map/execution-environments.md
+++ b/maps/feature-map/execution-environments.md
@@ -38,6 +38,33 @@ Automated: [environment UI](../../ui/src/pages/CompanyEnvironments.test.tsx), [d
 
 Manual: Save a disposable target, reload it, and run its available probe. Verify both success and missing-credential/reachability errors identify the target. Confirm unavailable providers are not offered as working run targets.
 
+For an immutable sandbox image, pin the OCI image with `@sha256` and explicitly
+probe the saved environment in the intended company. The existing connection
+probe allocates a fresh lease and can measure its OS, architecture and libc.
+Qualification is recorded only when the selected image/configuration matches
+the live lease and cleanup is confirmed. Inspect `platformQualificationRecorded`
+and its diagnostic in the probe result: connection success alone does not mean
+the image has native runtime qualification.
+
+The measured record is server-owned, company-bound and tied to the effective
+configuration and active custom-image identity. Mutable tags, provider defaults
+and name-only snapshots do not qualify. Changing the target or image invalidates
+the record; normal metadata edits cannot forge or overwrite it, and API reads
+omit the private metadata. Reading this evidence for discovery or creation does
+not allocate a sandbox. The draft `probe-config` checks are not a saved-image
+qualification operation. See the [runtime contract](../../packages/paperclip-runner/README.md)
+and [adapter validation recipe](./runs-adapters.md#adapter-setup) for native
+binary/provider readiness after platform qualification.
+
+Verification recipe: probe a pinned owned image, record its company/config/image
+identity and cleanup result, then change the image or target and verify its old
+qualification is not reused. A mutable-image connection can succeed while
+qualification remains absent. Assert ordinary agent and non-admin board probe
+requests are denied, and environment create/PATCH payloads cannot supply
+qualification metadata.
+This recipe and its [probe controls](../../server/src/__tests__/environment-probe.test.ts)
+are not claims that a live provider or agent-access journey ran for this map update.
+
 The local row has no UI Test button. Its API/CLI probe reports host/cwd
 availability only; it does not validate an adapter binary, workspace, or task
 execution. Remote-driver probes and a real bounded run need their own evidence.
@@ -51,5 +78,7 @@ Manual: Run a bounded command in the intended target, inspect its output and wor
 ## Gotchas
 
 - A probe is narrower evidence than a complete task with tools, files, and resumption.
+- Platform qualification does not authenticate a model account or qualify every
+  harness; the selected native runtime still needs its own setup and useful-task proof.
 - The local option may appear only when editing an existing local environment; availability follows current UI/provider capabilities.
 - Workspace service reachability and environment reachability are separate checks.
diff --git a/maps/feature-map/onboarding.md b/maps/feature-map/onboarding.md
index ecfaeefaaef..5a411e3ebfa 100644
--- a/maps/feature-map/onboarding.md
+++ b/maps/feature-map/onboarding.md
@@ -50,6 +50,22 @@ company's onboarding route, and finish; drafts save automatically. Follow the
 created first task, verify the selected agent and company, and inspect its output
 or explicit authentication gate. Reload both company and task.
 
+For Codex, choose the harness and leave runner selection automatic to prove the
+first-agent default. On a qualified target it saves Paperclip Runner; Advanced
+also permits Legacy. Do not switch runners after onboarding when claiming proof
+of that default. Test the selected runtime and account, then complete a bounded
+useful task and follow-up with an independently checked file artifact. Saved
+execution configuration and recorded run identity must match after reload.
+Use [runner validation](./runs-adapters.md#adapter-setup) and
+[environment qualification](./execution-environments.md#environment-settings)
+for the prerequisites; a successful login alone is insufficient.
+
+Leave and resume during harness/runner setup. Confirm the draft retains the
+explicit choice and compatible account bindings, old native Codex setup links
+recover the harness and runner, and a changed harness or runner invalidates stale
+test results. Existing Legacy agents remain Legacy when their onboarding/setup
+configuration is reopened; this journey does not migrate them.
+
 ### `cli-setup`
 
 Automated: [CLI onboarding](../../cli/src/__tests__/onboard.test.ts) and [isolated test drive](../../cli/src/__tests__/test-drive.test.ts) cover their setup contracts; they do not establish that every model account is usable.
diff --git a/maps/feature-map/runs-adapters.md b/maps/feature-map/runs-adapters.md
index 738e7d4eb6b..b2d761d2944 100644
--- a/maps/feature-map/runs-adapters.md
+++ b/maps/feature-map/runs-adapters.md
@@ -37,12 +37,44 @@ models/authentication and unsupported Legacy-only options must fail visibly.
 
 Manual: Select the intended adapter and account, refresh model choices, and run its environment test. Save, reload, then execute a small task. Repeat with a deliberately unavailable account and verify the failure remains visible.
 
+Choose Codex as the harness; the UI displays its name/icon for both runners.
+Advanced identifies the automatic default and offers Paperclip Runner or Legacy.
+Only new Codex agents default to the native runner on supported macOS or GNU/Linux
+targets; the [shared selection contract](../../packages/shared/src/agent-runner.ts)
+and [runtime prerequisites](../../packages/paperclip-runner/README.md) define the
+platform/libc boundary. Windows and Alpine/musl remain Legacy; other harness
+defaults are unchanged. Disabled adapters, external overrides, and selected-target
+qualification also affect availability.
+
+For sandbox defaults, follow the [environment probe](./execution-environments.md#environment-settings)
+recipe first. Discovery/creation read company-bound immutable-image evidence
+without allocating a target. A mutable image or snapshot name does not establish
+native compatibility. Then test the actual selected runtime with its selected
+account/model: a legacy CLI or authentication probe alone cannot establish native
+readiness. Missing dependencies, failed authentication, invalid models and
+incompatible custom settings must remain actionable errors without silent runner
+switching. Saved unchanged execution can still be tested without applying new
+selection policy, but runtime/account validation must still run.
+
+Verify an automatic Codex hire and an explicit Legacy control through a useful
+file artifact, follow-up and reload. Preserve Codex reasoning effort and account
+isolation; retain explicit Legacy permission choices, including false. Reopen an
+existing agent, make an unrelated edit, and confirm both its persisted runner and
+next run stay unchanged. Use [hiring/import preservation](./agents.md#hire-agent)
+for approval and portability controls.
+
 ### `run-history`
 
 Automated: [live run routes](../../server/src/__tests__/agent-live-run-routes.test.ts) and [run event sequencing](../../server/src/__tests__/heartbeat-run-event-sequencing.test.ts) cover run data contracts.
 
 Manual: Start a disposable task, open its running transcript, and follow it to a terminal outcome. Reload and compare task/run IDs, status, output, and cost. Verify a failed run remains distinguishable from a completed run with useful output.
 
+An explicit runner change starts a configuration revision and invalidates the
+eligible session. Active runs, restart recovery and historical transcript parsing
+retain their recorded execution configuration; do not infer their runner from a
+later edit to the agent. Account/harness branding and execution identity are
+different observations, both required in the evidence.
+
 ## Gotchas
 
 - Model accounts are managed in Apps and inline agent account controls.
diff --git a/packages/paperclip-runner/scripts/release-provider-pack.test.mjs b/packages/paperclip-runner/scripts/release-provider-pack.test.mjs
index 5dded2a32fd..171edd46f06 100644
--- a/packages/paperclip-runner/scripts/release-provider-pack.test.mjs
+++ b/packages/paperclip-runner/scripts/release-provider-pack.test.mjs
@@ -52,7 +52,7 @@ test("release assembly rejects rehashed stale or missing packs before staging an
   const source = dirname(dirname(fileURLToPath(import.meta.url)));
   try {
     // Run the actual assembler in an isolated layout so it cannot overwrite built artifacts.
-    for (const file of ["scripts/stage-release-runner-binaries.mjs", "scripts/release-provider-pack.mjs", "src/live/runner-binary.ts", "acpx-profiles.json", "cursor-distributions.json"]) {
+    for (const file of ["scripts/stage-release-runner-binaries.mjs", "scripts/release-provider-pack.mjs", "src/live/runner-binary.ts", "acpx-profiles.json", "cursor-distributions.json", "release-runner-targets.json"]) {
       mkdirSync(dirname(join(root, file)), { recursive: true }); cpSync(join(source, file), join(root, file));
     }
     const platforms = {};
diff --git a/server/src/services/agent-runner-selection.test.ts b/server/src/services/agent-runner-selection.test.ts
index 9fd4d748ce1..a8d6bc60c27 100644
--- a/server/src/services/agent-runner-selection.test.ts
+++ b/server/src/services/agent-runner-selection.test.ts
@@ -9,7 +9,8 @@ vi.mock("./environment-probe.js", () => ({ readSandboxPlatformQualification: sta
 vi.mock("./environment-config.js", () => ({ resolveEnvironmentDriverConfigForRuntime: state.resolveEnvironment }));
 vi.mock("@paperclipai/adapter-utils/ssh", () => ({ runSshCommand: state.ssh }));
 import { AGENT_RUNNER_SSH_PLATFORM_COMMAND, agentRunnerAvailability, resolveAgentRunnerTargetForCompany, resolveNewAgentRunner, resolveNewAgentRunnerForCompany } from "./agent-runner-selection.js";
-import { buildCodexAcpConfig } from "@paperclipai/adapter-codex-local/server";
+import { buildCodexAcpConfig, resolveCodexExecutionEngine } from "@paperclipai/adapter-codex-local/server";
+import { secretService } from "./secrets.js";
 import { localAgentRunnerTarget } from "../lib/agent-runner-platform.js";
 const target = { driver: "local", platform: "linux", architecture: "x64" };
 const qualifiedTargets = [target, { driver: "local", platform: "linux", architecture: "arm64" }, { driver: "local", platform: "darwin", architecture: "arm64" }, { driver: "local", platform: "darwin", architecture: "x64" }];
@@ -183,6 +184,71 @@ describe("server-owned Codex runner selection", () => {
       .toThrow(expect.objectContaining({ status: 422, details: { code: "agent_runner_config_incompatible", fields: ["acpPermissionMode"] } }));
   });
 
+  it.each([undefined, "acp"])("rejects effective Legacy ACP network denial for engine=%s before native selection", async engine => {
+    const adapterConfig = { ...(engine ? { engine } : {}), env: { PAPERCLIP_CODEX_ACP_NETWORK_ACCESS: "false" } };
+    expect(resolveCodexExecutionEngine(adapterConfig).engine).toBe("acp");
+    expect(buildCodexAcpConfig(adapterConfig)).toMatchObject({ env: { PAPERCLIP_CODEX_ACP_NETWORK_ACCESS: "false" } });
+    // Native permissions use a separately trusted server variable. This would
+    // enable networking despite the saved Legacy flag without admission rejection.
+    const { codexNetworkAccess } = await import(new URL(
+      "../../../packages/paperclip-runner/src/drivers/codex/codex-security-config.ts", import.meta.url,
+    ).href);
+    expect(codexNetworkAccess({ PAPERCLIP_RUNNER_NETWORK_ACCESS: "enabled", PAPERCLIP_CODEX_ACP_NETWORK_ACCESS: "false" })).toBe(true);
+    for (const runner of [undefined, "auto", "paperclip"] as const) {
+      expect(() => resolveNewAgentRunner({ adapterType: "codex_local", adapterConfig, target, runner }))
+        .toThrow(expect.objectContaining({ status: 422, details: { code: "agent_runner_config_incompatible", fields: ["env.PAPERCLIP_CODEX_ACP_NETWORK_ACCESS"] } }));
+    }
+    expect(resolveNewAgentRunner({ adapterType: "codex_local", adapterConfig, target, runner: "legacy" }))
+      .toEqual({ adapterType: "codex_local", adapterConfig });
+    expect(adapterConfig.env).toEqual({ PAPERCLIP_CODEX_ACP_NETWORK_ACCESS: "false" });
+  });
+
+  it.each([
+    { type: "plain", value: "false" },
+    { type: "secret_ref", secretId: "fixture-policy", version: "latest" },
+    { type: "user_secret_ref", key: "fixture-policy", version: "latest" },
+  ])("does not discard a bound ACP network restriction or guess its value (%j)", async binding => {
+    const adapterConfig = { engine: "acp", env: { PAPERCLIP_CODEX_ACP_NETWORK_ACCESS: binding } };
+    if (binding.type === "plain") {
+      const resolved = await secretService({} as never).resolveEnvBindings("fixture-company", adapterConfig.env);
+      expect(buildCodexAcpConfig({ ...adapterConfig, env: resolved.env }))
+        .toMatchObject({ env: { PAPERCLIP_CODEX_ACP_NETWORK_ACCESS: "false" } });
+    }
+    expect(() => resolveNewAgentRunner({ adapterType: "codex_local", adapterConfig, target }))
+      .toThrow(expect.objectContaining({ status: 422, details: { code: "agent_runner_config_incompatible", fields: ["env.PAPERCLIP_CODEX_ACP_NETWORK_ACCESS"] } }));
+    expect(resolveNewAgentRunner({ adapterType: "codex_local", adapterConfig, target, runner: "legacy" }))
+      .toEqual({ adapterType: "codex_local", adapterConfig });
+  });
+
+  it.each([
+    { extraArgs: ["-c", "sandbox_workspace_write.network_access=true"] },
+    { extraArgs: [], args: ["-c", "sandbox_workspace_write.network_access=true"] },
+  ])("retains actionable argument errors when Legacy arguments override a network flag (%j)", args => {
+    const adapterConfig = { engine: "acp", ...args, env: { PAPERCLIP_CODEX_ACP_NETWORK_ACCESS: "false" } };
+    expect(buildCodexAcpConfig(adapterConfig)).toMatchObject({ env: { PAPERCLIP_CODEX_ACP_NETWORK_ACCESS: "true" } });
+    expect(() => resolveNewAgentRunner({ adapterType: "codex_local", adapterConfig, target }))
+      .toThrow(expect.objectContaining({ status: 422, details: { code: "agent_runner_config_incompatible", fields: [args.extraArgs.length ? "extraArgs" : "args"] } }));
+  });
+
+  it.each(["true", "False", " false ", { type: "plain", value: "true" }])("keeps compatible ACP environment settings (%j) and native idempotence", value => {
+    const adapterConfig = { engine: "acp", env: { PAPERCLIP_CODEX_ACP_NETWORK_ACCESS: value, OPENAI_API_KEY: { type: "secret_ref", secretId: "fixture-api-key" } } };
+    const literal = typeof value === "string" ? value : value.value;
+    expect(buildCodexAcpConfig({ ...adapterConfig, env: { PAPERCLIP_CODEX_ACP_NETWORK_ACCESS: literal } }))
+      .toMatchObject({ env: { PAPERCLIP_CODEX_ACP_NETWORK_ACCESS: "true" } });
+    const resolved = resolveNewAgentRunner({ adapterType: "codex_local", adapterConfig, target });
+    expect(resolved.adapterType).toBe("paperclip_runner");
+    expect(resolved.adapterConfig.env).toEqual(adapterConfig.env);
+    expect(resolveNewAgentRunner(resolved)).toEqual(resolved);
+  });
+
+  it("keeps a saved native profile and an explicitly selected Legacy CLI's unused ACP flag unchanged", () => {
+    const adapterConfig = { engine: "cli", env: { PAPERCLIP_CODEX_ACP_NETWORK_ACCESS: "false" } };
+    expect(resolveCodexExecutionEngine(adapterConfig).engine).toBe("cli");
+    expect(resolveNewAgentRunner({ adapterType: "codex_local", adapterConfig, target }).adapterType).toBe("paperclip_runner");
+    const saved = { adapterType: "paperclip_runner", adapterConfig: { provider: "codex", env: adapterConfig.env } };
+    expect(resolveNewAgentRunner(saved)).toEqual(saved);
+  });
+
   it("preserves explicit historical native profiles, including managed configurations", () => {
     for (const config of [{ provider: "acpx", acpxAgent: "claude", model: "claude-sonnet-5" }, { provider: "claude_managed", managedProfileId: "profile", managedAgentsRetentionAcknowledged: true }, { provider: "aws_agentcore", agentCoreProfileId: "profile" }]) expect(resolveNewAgentRunner({ adapterType: "paperclip_runner", adapterConfig: config })).toEqual({ adapterType: "paperclip_runner", adapterConfig: config });
   });
diff --git a/server/src/services/agent-runner-selection.ts b/server/src/services/agent-runner-selection.ts
index 6842cf4c164..3d5ad289de2 100644
--- a/server/src/services/agent-runner-selection.ts
+++ b/server/src/services/agent-runner-selection.ts
@@ -155,6 +155,18 @@ export function resolveNewAgentRunner(input: AgentRunnerSelection): { adapterTyp
   if (config.dangerouslyBypassApprovalsAndSandbox === false) unsupported.push("dangerouslyBypassApprovalsAndSandbox");
   if (config.dangerouslyBypassSandbox === false) unsupported.push("dangerouslyBypassSandbox");
   if (unsupported.length) incompatible(unsupported.map(field => aliasSources.get(field) ?? field));
+  const env = config.env && typeof config.env === "object" && !Array.isArray(config.env)
+    ? config.env as Record<string, unknown> : {};
+  const network = env.PAPERCLIP_CODEX_ACP_NETWORK_ACCESS;
+  const binding = network && typeof network === "object" && !Array.isArray(network)
+    ? network as Record<string, unknown> : null;
+  // Native networking is server-owned. Never translate a Legacy restriction
+  // into that trusted variable, or guess the value of a deferred policy binding.
+  if (config.engine !== "cli" && (network === "false"
+    || (binding?.type === "plain" && binding.value === "false")
+    || binding?.type === "secret_ref" || binding?.type === "user_secret_ref")) {
+    incompatible(["env.PAPERCLIP_CODEX_ACP_NETWORK_ACCESS"]);
+  }
   const effort = config.modelReasoningEffort ?? config.reasoningEffort ?? config.effort;
   for (const key of ["engine", "command", "extraArgs", "args", "agentCommand", "mode", "nonInteractivePermissions", "stateDir", "warmHandleIdleMs", "dangerouslyBypassApprovalsAndSandbox", "dangerouslyBypassSandbox", "search", "fastMode", "reasoningEffort", "effort"]) delete config[key];
   if (config.model !== undefined && typeof config.model !== "string") incompatible(["model"]);