fix(server): Codex /goal resume no longer fails with EmptyInput

[fixfon]

/goal resume can fail with EmptyInput when Codex has already started a goal turn during thread resume. The adapter now claims that running turn, or holds the run for native goal activation, instead of submitting an empty turn/start. Explicit resume intent keeps native starts claimable while the goal read and settings update are pending, and Stop cancels that intent.

During activation, Stop resolves the resume’s claimed turn from the activation record. After activation, thread-wide Stop resolves the current native goal root or hold from existing adapter context, so projection lag cannot redirect it to earlier background work. Stop captures the requested and current goal lineage before pausing and follows continuations afterward. Activation keeps the hold open; inactive goals settle it.

Before activation, thread/settings/update applies the requesting run’s future-turn configuration without launching another turn. Resume failures cancel pending intent and settle any hold as interrupted. Waiting native work is paused and interrupted; owned work uses the existing Stop path, including descendant and retained-work cleanup. Cleanup errors are logged while the original resume error reaches the caller.

An already-running adopted turn keeps the model, approval policy, and sandbox it started with. Settings updates affect later turns. Successful resume adopts existing native work without restarting it.

Maintainer takeover of @fixfon’s change; original commits are preserved. Fixes #20232.

Verification on Linux:

• All 175 tests in the existing adapter suite pass (173 before takeover). The four original resume tests were rewritten into six focused tests, including the shared failure/Stop scenario. Existing resume, goal Stop and restart coverage remains. One shared 19-case scenario covers read/settings/activation errors, Stop before and after claim, completion/continuation during pause, and a pause failure after native work was stopped. Five cases stop after startTurn returns successfully, with an earlier projected turn as the production thread-wide Stop target: adopted work, a synthetic hold, an adopted continuation, completion during pause, and continuation during pause. It checks original errors, interrupted settlement of owned work, no orphaned running projections and no duplicate native interrupt. Fail-before probes reproduce successful settlement after activation rejection and missed adopted work during activation. New probes against the prior production code reproduce missed adopted work and a synthetic hold reporting success after activation has returned.
• Targeted lint, formatting, and server typecheck pass. Two existing adapter unused-variable warnings remain.
• Authenticated Codex CLI 0.163.0 tests use disposable native threads and state. Paused and blocked goal activation applies updated model, approval and sandbox settings. Restart-active adoption attaches the already-running native turn and confirms that turn retains its original settings.
• The actual modified adapter completes paused/blocked resume and restart-active adoption without native turn/start. Existing goal Stop and restart-continuation tests pass.

No UI or wire contract changed; focused tests and headless adapter runs provide before/after proof. macOS, Windows, iOS, Android, packaged Electron desktop and older Codex versions were not verified here. Stop/fault interleavings use replay proof; event ingestion was not stalled in a live server. The T3 MCP collaboration-mode settings payload was not exercised live.

Implementation/tests: GPT-6.1 Sol and GPT-6 Astra through Codex in T3 Code. Independent reviews: Claude Opus 5.5 and GPT-6 Sol.

[macroscopeapp]

Approvability

Verdict: Approved at 7167433

Macroscope's review found this PR approvable — This is a contained Codex orchestration bug fix that removes the invalid empty-input start and preserves existing goal continuation behavior through targeted turn adoption and hold logic. The added replay tests cover the affected resume scenarios without changing production behavior themselves.

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• apps/server/src/orchestration-v2/Adapters/CodexAdapterV2.test.ts
• apps/server/src/orchestration-v2/Adapters/CodexAdapterV2.ts

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• apps/server/src/orchestration-v2/Adapters/CodexAdapterV2.test.ts
• apps/server/src/orchestration-v2/Adapters/CodexAdapterV2.ts

🚧 Files skipped from review as they are similar to previous changes: 2

• apps/server/src/orchestration-v2/Adapters/CodexAdapterV2.test.ts
• apps/server/src/orchestration-v2/Adapters/CodexAdapterV2.ts

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📝 Walkthrough

The Codex adapter now tracks root turns that are not associated with a run. Goal resume claims an existing or later-started turn instead of issuing an empty native turn start. Hold-grace timing now accounts for goal activation. Replay tests cover turn adoption, inactive goals, and delayed activation.

Changes: Codex goal resume

Layer / File(s)	Summary
Track unowned root turns apps/server/src/orchestration-v2/Adapters/CodexAdapterV2.ts	The adapter records an unowned root turn’s thread ID, native turn ID, and start time. It removes the record when the matching turn completes.
Claim a turn and manage hold grace apps/server/src/orchestration-v2/Adapters/CodexAdapterV2.ts, apps/server/src/orchestration-v2/Adapters/CodexAdapterV2.test.ts	Goal resume claims an existing or subsequently started turn instead of starting a native turn with empty input. If no turn is recorded, the adapter holds a completed “Goal resumed.” command turn while waiting for Codex to start one. Hold grace starts after activation finishes when the goal remains active and a hold exists. Replay tests cover active turns, continuations, inactive goals, and delayed activation.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix · Severity of issue fixed: Medium

Merge Risk: 🟡 Moderate · up to 38429

A resumed goal can lose work or approval events, or leave its run open, under specific event timings. Resolve these risks before merging unless they are explicitly accepted.

Security architecture risk: 🟡 Moderate · up to 71674

Resuming a paused goal can now start continued work without applying the requesting run’s sandbox and approval settings. If the previous turn had broader permissions, resumed work may retain them. Normal adoption and completion paths are covered by replay tests, but this permission-transition case remains unresolved.

Retained concerns

• Medium · security · inferred: When no native turn is running, resuming an inactive goal now activates continued execution without applying or checking the requesting run’s sandbox and approval policy. If the saved native settings are broader, the resumed goal can execute under that prior authority despite a stricter requested policy. This differs from merely adopting an autonomous turn that was already running before the command.

Security review details

Security Blast Radius

• inferred — The identified exposure concerns the resumed native thread’s execution authority. With previously saved full-access settings, commands and filesystem operations may retain broader authority than the current run requests. Evidence does not establish additional cross-user or cross-environment reach.

Security Findings and Attack Paths

• inferred — If an inactive goal retains permissive native settings while its resume input requests stricter controls, the newly successful activation path can continue goal-driven execution without those controls being reapplied. Goal content could consequently drive operations under the prior authority. Existing autonomous execution before adoption predates this PR and is not separately classified as an introduced issue.

Trust Boundaries and Controls

• observed — Ownership association is scoped by native-thread identity and serialized during claiming. Existing handling pauses and interrupts a known active goal turn that starts without a run. Approval handlers mediate requests issued by Codex, but cannot impose a stricter sandbox or generate approval requests that the native policy omits.

Hardening Proposals

• proposed — Check effective native-policy compatibility before activating or claiming a resumed goal. If requested controls are stricter, refuse or pause resume until they can be enforced through a supported mechanism rather than silently inheriting broader permissions.

Pre-merge checks: 4

Check name	Status	Explanation
Linked Issues check		The changes satisfy the coding requirements in directly linked issue #20232. CodexAdapterV2.ts tracks an unowned root turn, attaches /goal resume to that turn, or holds the run for the next turn a…
Out of Scope Changes check		The reviewed changes are limited to CodexAdapterV2.ts and its tests. Root-turn tracking, goal-hold timing, and /goal resume handling directly support issue #20232. The tests verify the required be…
Title check		The title is concise, conventional, and accurately identifies the main fix: preventing Codex /goal resume from failing with EmptyInput.
Description check		The description explains the problem, implementation, scope, linked issue, maintainer takeover, detailed verification, limitations, and testing environment. It provides sufficient context for review a…

Full details: Linked Issues check

Explanation

The changes satisfy the coding requirements in directly linked issue #20232. CodexAdapterV2.ts tracks an unowned root turn, attaches /goal resume to that turn, or holds the run for the next turn after goal activation. The resume path does not call turn/start, so it avoids the EmptyInput failure. The implementation settles the run when the goal remains inactive. CodexAdapterV2.test.ts covers attachment, continuation adoption, inactive-goal settlement, delayed activation, and the absence of turn/start.

Full details: Out of Scope Changes check

Explanation

The reviewed changes are limited to CodexAdapterV2.ts and its tests. Root-turn tracking, goal-hold timing, and /goal resume handling directly support issue #20232. The tests verify the required behavior. No unrelated production behavior is demonstrated, and the restart-continuation behavior from #17589 is not changed.

Full details: Description check

Explanation

The description explains the problem, implementation, scope, linked issue, maintainer takeover, detailed verification, limitations, and testing environment. It provides sufficient context for review and matches the requested change.

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Actionable comments posted: 3

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• 🪄 Fix comments: Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
Review comments at @apps/server/src/orchestration-v2/Adapters/CodexAdapterV2.ts:
- Around line 5993-5995: Update the unowned-turn completion handler around
`unownedRootTurns` to perform its lookup and finalization under the same
`turnTerminalizationPermit` serialization used by `claimGoalTurn` and
`registerRootTurn`, so completion cannot be lost while a claim is in progress.
- Line 6269: Update the turn registration flow around registerRootTurn and
claimGoalTurn to preserve events received before the turn enters activeTurns.
Register or buffer events for the unowned turn before attaching the run, then
replay or process them once the turn is registered so item/started events and
native approval requests are not dropped.
- Line 6266: Update the resumed-goal path around completeGoalCommandTurn so its
synthetic turn does not start the five-second continuation grace period before
thread/goal/set completes. Keep the initial resume hold until activation
establishes an inactive goal or a resumed turn is available to attach, then
apply the post-turn grace period as appropriate.

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[ScottN-PV]

Note

Written by Claude Opus 5.5 on behalf of ScottN-PV.

In case a real-server check helps: this reproduces on main cfafb4b (not this branch), Linux, Codex CLI 0.163.0.

1. With a goal active on a Codex thread, restart the T3 server with continueThreadsAfterServerUpdate off.
2. Send /goal resume. T3 sends thread/resume, Codex emits turn/started (inProgress) 288 ms later, then T3's empty turn/start gets EmptyInput. The run fails and the goal stays active.

With no native turn running (paused goal, idle thread), the same command did not fail on 0.163.0: Codex accepted the empty turn/start.

[juliusmarminge]

Taking over this one as maintainer for batch codex-07. I will rebuild the goal-resume behavior against current main, minimize the regression coverage, verify provider behavior where available, and run independent reviews. Original history and credit will be preserved; this stays unmerged.