[TheAnimatrix]

Fixes #15611 (maintainer-triaged: #15717 was closed as its duplicate and pointed at the then-open fix). Smaller alternative to #18631, see the last section.

Problem

Clicking edit on a queued message loads its text into the composer, but the queued run stays drainable on the server. If the active turn finishes while the user is still editing, the server starts the run with the original text and the client can only show the "Queued message is no longer queued" toast. The text being typed is lost or has to be re-sent.

Fix

• A queued run carries a new optional editing flag, set and cleared by a new queued-run.editing command.
• startNextQueuedRun returns when the next run to start is being edited. Earlier queued messages still go out; later ones wait behind the edited one, so the queue keeps its order.
• The flag is separate from queueHeld, so a Stop pressed during an edit still holds the queue after the edit ends, and a release never un-stops a queue.
• The guard sits after the provider-failure and missing-worktree pause checks, so those pauses are still recorded while the head message is being edited. Clearing the flag re-checks the queue like queue.resume does, but judges the latest executed run itself, so a release that reaches the queue before the terminal listener cannot start the message against a failed provider or outside its worktree. A reorder now re-checks the queue the same way, so moving a message ahead of an edited head starts it.
• queue.resume also clears editing, so a flag left behind by a client that vanished mid-edit has a way out. isHeld (client-runtime) and hasHeldQueuedRuns (web) count an edit in progress so that Resume is offered; the composer already hides Resume while this client is editing.
• The web edit hook marks the run before entering edit mode (so switching the edit to another queued message never leaves a gap) and clears it from a single effect cleanup that covers save, cancel, leaving the thread and unmount. The edit session captures its environment so the clear still targets the right server after navigating elsewhere.
• Thread presentation: a new shared latestRunNotWaitingOnUser treats the edited message and the ones behind it as waiting on the user, so an idle thread does not show as queued/working in the sidebar while its head message is being edited. The shell SQL mirrors it. latestUnheldRun is unchanged for the delegated-task settle logic, whose SQL mirror is also unchanged, so SQL and in-memory stay in agreement on both paths.

System and performance notes

• No new reads on hot paths. The flag rides on the existing run.updated event and run payload; the drain guard reads a field of the projection it already loaded. A reorder's re-check exits at the existing canStartQueuedRun pre-filter while a run is active.
• The shell query's edit-position lookup sits in the last OR branch of the presented filter, so SQLite evaluates it only for a queued, unheld candidate. A thread whose newest run is not queued never pays for it. Measured on a scratch database with the production indexes, 3000 threads and 300k runs: common case (no queued runs) 2.7 ms, identical to main; adversarial case (every thread ending in eight blocked queued runs) 53 ms. A MATERIALIZED CTE variant was slower in both cases (5.1 ms / 62 ms) because every thread paid for the materialization, so it was not used.
• Older servers reject the new command; the client sends it silently and the editor keeps today's behavior. No protocol or capability change.

Verification

• runtimeLayer.test.ts: the edited message and the ones behind it wait and start on release; editing a later message does not block the one ahead; a release does not resume a stopped queue; a provider failure while the head is being edited still holds the queue; a release that arrives before the terminal listener still holds the queue; a reorder past an edited head starts the moved message. The first test fails with the guard removed, the failure tests fail with the guard in its earlier position or without the latest-run judgement, and the reorder test fails without the re-check.
• ProjectionStore.test.ts: the SQL shell and the in-memory shell agree with an editing queued run and with a reordered run ahead of it. New orchestrationV2ThreadError.test.ts covers the position rule, including positions that disagree with ordinals.
• threadWorkflows.test.ts, threadExecution.test.ts and commands.test.ts in client-runtime pass.
• Typecheck for contracts, shared, client-runtime, server and web; format and lint on the changed files.
• Not yet exercised in a running browser; a short recording of edit held through turn completion can be added on request.

Relation to #18631

#18631 solves the same bug with an owner token per edit, takeover confirmation between devices, persisted edit drafts, a protocol capability, and a mobile rewrite, and is gated on native evidence and human review of that lifecycle. This PR takes only the server-side hold and the three gaps its reviewers found (pause ordering, release/reorder re-check, thread presentation), and leaves ownership semantics out: two clients editing the same message both set the flag and the last to finish clears it. Mobile keeps today's behavior and can adopt setQueuedRunEditing in a follow-up.

Models

Claude Fable 5.1 (design and review), Claude Sonnet 5.5 (implementation), GPT-6.1 Sol (independent review).

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Reviewing files that changed from the base of the PR and between be6b8c2 and 33cfce9.

📒 Files selected for processing: 8

• apps/server/src/orchestration-v2/Orchestrator.ts
• apps/server/src/orchestration-v2/ProjectionStore.test.ts
• apps/server/src/orchestration-v2/ProjectionStore.ts
• apps/server/src/orchestration-v2/runtimeLayer.test.ts
• apps/web/src/components/ChatView.tsx
• packages/client-runtime/src/state/threadExecution.ts
• packages/shared/src/orchestrationV2ThreadError.test.ts
• packages/shared/src/orchestrationV2ThreadError.ts

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📝 Walkthrough

The change adds a queued-run.editing command and run state. The client marks runs during editing. Server queue advancement and presented-run selection account for edited queued runs.

Changes: Queued-run editing

Layer / File(s)	Summary
Editing contract and client lifecycle packages/contracts/src/orchestrationV2.ts, packages/client-runtime/src/operations/commands.ts, packages/client-runtime/src/state/threadCommands.ts, apps/web/src/components/chat/useQueuedRunEdit.ts, apps/server/src/orchestration-v2/testkit/OrchestratorScenario.ts	The contract and client runtime add queued-run.editing. The edit hook marks and clears the targeted queued run using captured identifiers.
Presented-run selection packages/shared/src/orchestrationV2ThreadError.ts, packages/client-runtime/src/state/threadExecution.ts, packages/client-runtime/src/state/threadWorkflows.ts, apps/web/src/components/ChatView.tsx, packages/shared/src/orchestrationV2ThreadError.test.ts	Latest-run selection excludes held queued runs and queued runs at or after the earliest editing position. Client queue-state checks include editing runs.
Queue processing and advancement apps/server/src/orchestration-v2/Orchestrator.ts	The orchestrator validates editing updates, prevents editing runs from starting, clears editing on resume, and advances the queue after relevant commands.
Projection and runtime validation apps/server/src/orchestration-v2/ProjectionStore.ts, apps/server/src/orchestration-v2/ProjectionStore.test.ts, apps/server/src/orchestration-v2/runtimeLayer.test.ts	Shell projections and runtime tests cover editing order, reordering, provider failures, projection races, and explicitly stopped queues.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant useQueuedRunEdit
  participant setQueuedRunEditing
  participant Orchestrator
  participant ProjectionStore
  useQueuedRunEdit->>setQueuedRunEditing: Dispatch queued-run.editing
  setQueuedRunEditing->>Orchestrator: Send editing state
  Orchestrator->>Orchestrator: Hold edited queued runs
  Orchestrator->>ProjectionStore: Record run.updated
  ProjectionStore->>ProjectionStore: Exclude edited queued runs from latest-run selection
  useQueuedRunEdit->>setQueuedRunEditing: Clear editing state
  setQueuedRunEditing->>Orchestrator: Send editing=false
  Orchestrator->>Orchestrator: Attempt queue advancement

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Possibly related PRs

• pingdotgg/t3code#15612: This PR also changes queued-run editing and queue holds.
• pingdotgg/t3code#18631: This PR also adds server-backed state for queued-run editing and release handling.

Suggested reviewers: juliusmarminge

Merge Risk: 🟡 Moderate · up to 33cfc

A queued message can still start while its edit is opening. Resolve that timing gap before merging; the other queue-order concerns do not require changes.

Security architecture risk: 🔵 Low · up to 33cfc

The change retains existing authorization and thread boundaries. Its main design limitation is that the editing pause is shared rather than owned by an edit session, so one client's cleanup can release another client's active edit.

Retained concerns

• Low · reliability · inferred: The newly introduced editing hold is an unowned boolean. If two authorized clients edit the same queued run, either client's cleanup can set editing to false and trigger queue advancement while the other still edits. Capturing environment, thread, and run identity prevents misdirected cleanup but does not distinguish edit sessions. This is a limitation of the new hold's ownership guarantee, not evidence of new unauthorized access.

Security review details

Security Blast Radius

• inferred — The inspected mutation and resulting queue advancement are confined to the addressed thread within the authenticated environment. Environment-level operators retain their existing ability to control threads; no new cross-environment authority or provider privilege was established.

Security Findings and Attack Paths

• inferred — The supported adverse path is conflicting authorized edit sessions: both mark the same run, one ends and clears the shared boolean, and the queue can start the original message while the other still edits. This is not an authentication bypass, and the base already allowed queued messages to start during editing; the concern is the new control's lack of session ownership.

Trust Boundaries and Controls

• observed — Websocket session authentication and orchestration:operate authorization protect the generic dispatch route. The new handler additionally binds run identity to the supplied thread projection and queued status. The inspected path uses environment-level authority rather than a separate per-thread user-owner check, consistent with neighboring queued-run mutations.

Resilience and Maintainability Implications

• inferred — Entering edit mode does not await server acknowledgement: the hook discards the editing-command promise and immediately activates the composer. Queue completion can therefore win before the marker persists. This leaves part of the preexisting edit/start race unresolved rather than demonstrating that the PR worsens it; local command serialization does not serialize against server-originated completion.

Hardening Proposals

• proposed — If editing must provide a reservation across clients, use server-acknowledged edit acquisition and session-scoped release so stale cleanup cannot release a newer editor. Keep explicit resume as a deliberate recovery override rather than treating ordinary cleanup as equivalent authority.

Pre-merge checks: 4

Check name	Status	Explanation
Title check		The title clearly and concisely describes the primary fix: preventing an edited queued message from starting when the active turn ends.
Description check		The description is complete and relevant. It explains the problem, implementation, scope, approval context, verification coverage, performance considerations, and known limitation that browser behavio…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Description check

Explanation

The description is complete and relevant. It explains the problem, implementation, scope, approval context, verification coverage, performance considerations, and known limitation that browser behavior was not tested.

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Inline comments:
Review comments at @apps/server/src/orchestration-v2/Orchestrator.ts:
- Around line 442-443: Update resumesQueue to include committed
queued-run.reorder events so reordering the queue head triggers
startNextQueuedRun when the active run has finished. Preserve the existing
queue.resume and non-editing queued-run.editing behavior.
- Line 1397: Update the dispatch flow around the storedQueuedRun editing guard
and dispatchMessage so a new message is queued whenever the queue head is being
edited, even if no run is active and a worktree exists. Ensure later dispatches
remain behind the paused edited message instead of starting immediately.

Review comments at @apps/web/src/components/chat/useQueuedRunEdit.ts:
- Line 241: Update the edit flow around markQueuedRunEditing to await the marker
command’s successful completion before opening or entering edit mode. Preserve
the existing behavior on success, but handle a rejected marker command by
stopping the flow so no edit draft opens or queued run edit state is entered.

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• apps/server/src/orchestration-v2/Orchestrator.ts
• apps/server/src/orchestration-v2/runtimeLayer.test.ts
• apps/server/src/orchestration-v2/testkit/OrchestratorScenario.ts
• apps/web/src/components/ChatView.tsx
• apps/web/src/components/chat/useQueuedRunEdit.ts
• packages/client-runtime/src/operations/commands.ts
• packages/client-runtime/src/state/threadCommands.ts
• packages/client-runtime/src/state/threadWorkflows.ts
• packages/contracts/src/orchestrationV2.ts

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[t3-code-bot]

closing at @StiensWout's request under Provide evidence for the changed behavior.

Changes queued-message editing across turn completion, the visible Resume availability and sidebar queued/working presentation, but explicitly has no running-browser verification or recording of the edit being held through completion. No before/after captures appear in the conversation.

submission evidence: "Not yet exercised in a running browser"

Attach before/after captures and a short recording showing a queued edit remaining held while the active turn completes, then save/cancel and Resume.

thanks for trying to help improve t3 code. if you think this closure was a mistake, please open a fresh pr addressing the requirement above, and link back to this one.