[juliusmarminge]

Stack: #21791 → #21792 → #21793.

Problem

Saving an open web or mobile scheduled-task editor sends stale values for controls the user did not change. A title-only save should preserve a newer prompt, model, workspace control, project, or binding from another client.

Change

Web, desktop, and mobile scheduled-task editors currently resend their opening snapshots. Send only fields changed by the user, scoped to the live task, and merge individual workspace controls without losing hidden fields or a concurrent binding. A real project move detaches its old binding. Missing tasks cannot be saved. Older servers use a live-snapshot upsert with requireExisting; that compatibility path remains non-atomic.

Scope and approval

Maintainer takeover of @saphid’s #11592, announced in the takeover comment. This stack rebuilds the same atomic-edit and scheduler concurrency scope against current main. The publishing maintainer, @juliusmarminge, is listed in the explicit maintainer triage exemptions; contribution eligibility is separate from correctness approval. This work remains unmerged and subject to current-head CI and human review.

Verification

Rebuilt from @saphid’s #11592.

Both client suites were rerun after main integration and pass: 72 cases, including five previously failing bot regressions and their controls. An unchanged draft normalizes a live sub-minute interval from the live row, even if the editor opened on a valid interval or webhook; an explicit schedule edit wins. The web patch saves the effective fallback model displayed by its picker while an untouched normal model preserves concurrent changes. Web/mobile typechecks and targeted lint pass.

Web proof captured at bc26b219a5, headless Linux: two separately paired clients edited a paused fixture. A stale title save preserved the newer prompt. Deleting the task disabled Save in the stale editor. A title-only save normalized 30 seconds to one minute. A missing-provider fixture displayed GPT-6-Astra and saved that effective selection; a read-only database query confirmed instanceId=codex/model=gpt-6-astra. All three tasks stayed paused with zero runs, then were deleted.

Stale draft before saving:

Result after saving:

Recording of the concurrent save.

Recording of the fallback-model save. The persisted selection changed from retired-proof/retired-model to codex/gpt-6-astra.

The subsequent reservation-predicate fix and main integration change no scheduler builder or exercised save path; these captures are reused proof of those unchanged flows, rather than captures of the later head. No visible controls were added. macOS, Windows, Electron, iOS, Android, remote relay/tunnel, and an actual older server were not exercised. Native mobile evidence remains a human check; shared web logic covers desktop, and focused mobile tests cover its separate builder.

Three independent review rounds addressed binding-mode, live-trigger, legacy-interval, model-selection, and project-scope findings. A later bot finding exposed a move between the dispatch re-read and reservation update. One additional timing case reproduced it, and the reservation now also matches the expected project. The fourth independent round (Claude Opus 5.5 and GPT-6 Sol) found no additional code blockers in each individual layer or the complete stack. Main was then integrated to retain its webhook acceptance claim cleanup; the fixture conflict preserves both incoming retry coverage and takeover credential/binding coverage. The fifth independent round (Claude Opus 5.5 and GPT-6 Sol) found no additional code blockers in each layer or the combined stack against the integrated main base. Current-head CI and bot reassessment remain required.

Implementation: GPT-6.1 Sol (high), Codex harness through T3 Code. Tests: GPT-6 Astra (high), Codex. Independent review: Claude Opus 5.5 and GPT-6 Sol through T3 Code.

[macroscopeapp]

Approvability

Verdict: Needs Human Approval

Macroscope's review found this PR requires human approval — This PR combines atomic scheduled-task persistence changes with substantial server, desktop, mobile, web, provider, VCS, connection, and UI behavior changes. The breadth and cross-platform runtime impact require a human review of integration and production effects.

Notes:

• All code in this push has already been reviewed. Approvability was decided on eligibility alone.

^{You can add or adjust custom eligibility rules. Learn more.}

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📒 Files selected for processing: 4

• apps/mobile/src/features/settings/scheduledTaskDraft.test.ts
• apps/mobile/src/features/settings/scheduledTaskDraft.ts
• apps/web/src/components/settings/scheduledTasksSettings.logic.test.ts
• apps/web/src/components/settings/scheduledTasksSettings.logic.ts

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📝 Walkthrough

Web and mobile scheduled-task editors build sparse updates from draft changes and live task state. They use the update command when the environment supports it and legacy-compatible upsert otherwise. New tasks continue to use upsert.

Changes: Scheduled task editing

Layer / File(s)	Summary
Update command and legacy conversion packages/client-runtime/src/state/server.ts, packages/contracts/src/scheduledTask.ts	The server environment adds the updateScheduledTask command. The scheduledTaskLegacyUpsert helper builds an upsert input from a task and partial update.
Sparse update construction and validation apps/mobile/src/features/settings/scheduledTaskDraft.ts, apps/mobile/src/features/settings/scheduledTaskDraft.test.ts, apps/web/src/components/settings/scheduledTasksSettings.logic.ts, apps/web/src/components/settings/scheduledTasksSettings.logic.test.ts	Web and mobile builders create patches for changed fields, including schedule, workspace, and project changes. Tests cover sparse edits, stale task values, minimum intervals, and legacy input conversion.
Editor submission paths apps/mobile/src/features/settings/SettingsScheduledTasksRouteScreen.tsx, apps/web/src/components/settings/ScheduledTasksSettings.tsx	Editors select update permissions and commands when supported. Existing tasks use a non-empty update patch or the legacy upsert path; task creation continues to use upsert.

Priority: ➖ Normal

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

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant Editor as Scheduled-task editor
  participant Builder as buildScheduledTaskUpdateInput
  participant Update as updateScheduledTask
  participant Converter as scheduledTaskLegacyUpsert
  participant Upsert as upsert command
  Editor->>Builder: Draft, baseline, and live task
  Builder-->>Editor: Sparse patch or null
  alt Update capability is available
    Editor->>Update: Submit sparse patch
  else Legacy path
    Editor->>Converter: Convert patch with live task
    Converter-->>Editor: Legacy upsert input
    Editor->>Upsert: Submit legacy input
  end

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Possibly related PRs

• pingdotgg/t3code#11592: Adds the scheduled-task update RPC and contract used by these editor changes.

Suggested reviewers: maria-rcks

Merge Risk: ⚪ Minimal · up to 4f7a6

Scheduled-task editors now send only the fields the user changed, so stale saves no longer overwrite newer edits. The earlier concern about the fallback model being dropped is fixed, and no merge-blocking risk remains.

Pre-merge checks: 4

Check name	Status	Explanation
Title check		The title clearly and concisely describes the main change: preserving concurrent scheduled-task edits across clients.
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.
Description check		The pull request description includes all required sections: Problem, Change, Scope and approval, and Verification. It explains the stale-update problem, describes the cross-client fix and legacy comp…

Full details: Description check

Explanation

The pull request description includes all required sections: Problem, Change, Scope and approval, and Verification. It explains the stale-update problem, describes the cross-client fix and legacy compatibility path, links the approval context, reports focused tests and observed results, includes UI screenshots and recordings, and lists untested environments and remaining checks.

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Actionable comments posted: 1

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• 🪄 Fix comments: Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at
@apps/web/src/components/settings/scheduledTasksSettings.logic.ts:
- Line 234: Update the patch condition for modelSelection to compare the
effective selection’s instanceId and model against baseline.modelKey, rather
than comparing draft.modelKey; this ensures the fallback shown by
activeSelection is saved when the selected project disables the draft’s current
instance.

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📥 Commits

Reviewing files that changed from the base of the PR and between e6158f5 and d068ea6.

📒 Files selected for processing: 8

• apps/mobile/src/features/settings/SettingsScheduledTasksRouteScreen.tsx
• apps/mobile/src/features/settings/scheduledTaskDraft.test.ts
• apps/mobile/src/features/settings/scheduledTaskDraft.ts
• apps/web/src/components/settings/ScheduledTasksSettings.tsx
• apps/web/src/components/settings/scheduledTasksSettings.logic.test.ts
• apps/web/src/components/settings/scheduledTasksSettings.logic.ts
• packages/client-runtime/src/state/server.ts
• packages/contracts/src/scheduledTask.ts

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Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

ℹ️ No successful main baseline artifact is available yet. This run establishes the initial measurement.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	—	5.0 KiB	—	6.8 KiB	✅
Codex	Thread snapshot wire	—	3.8 KiB	—	4.9 KiB	✅
Codex	Live turn WebSocket wire	—	1.2 KiB	—	2.0 KiB	✅
Codex	Live turn WebSocket decoded	—	20.9 KiB	—	29.3 KiB	✅
Codex	Live turn messages	—	2	—	8	✅
Claude	Total thread wire	—	5.0 KiB	—	6.8 KiB	✅
Claude	Thread snapshot wire	—	3.8 KiB	—	4.9 KiB	✅
Claude	Live turn WebSocket wire	—	1.2 KiB	—	2.0 KiB	✅
Claude	Live turn WebSocket decoded	—	21.2 KiB	—	29.3 KiB	✅
Claude	Live turn messages	—	2	—	8	✅

Baseline: unavailable · PR result: 5fe1b03 · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

• Codex decoded thread snapshot: 108.5 KiB
• Claude decoded thread snapshot: 108.8 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.

Dismissing prior approval to re-evaluate 5fe1b03