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feat(settings): per-project switch to turn off turn checkpoints - #24952
Every turn takes a Git snapshot of the whole workspace before it starts and after it finishes, and the run stays in waiting ("Agent is working") until the after-turn snapshot commits. In a very large workspace that snapshot dominates the turn, and there is currently no way to opt a project out.
Real case on Windows (nightly 0.1.3): one project is a Git repository with no commits, about 4.7 GB across roughly 60,000 files, most of them untracked generated assets. For turns in that project, orchestrationV2.checkpointCapture.execute took 27.4 s at p50 and 30.3 s at max across 16 runs. Some captures hit the 30 s VCS process timeout and recorded missing/error checkpoints. Over time that left about 1.9 GB of loose objects and stray tmp_obj_* files in .git. Every other project on the same machine finishes turns in about 1 s. The provider's result arrives within milliseconds of the model's last token, so the whole delay is the snapshot. This affects every provider, since capture is per project, not per provider.
This is the same waiting window discussed in #15124 and #23079. Those cover what happens while capture stalls; this PR gives users of very large workspaces a way to not pay for capture at all.
Why this fits the configuration-option route
Turn checkpoints are an established capability. T3 already records checkpoints as missing without running Git for workspaces that aren't Git repositories, and every downstream consumer (turn diffs, rollback, the composer's revert options) already handles that state. This option only lets a user put a Git workspace on that existing path. It adds no new workflow and keeps the default on.
Change
Contracts: adds checkpointCapture (default true) to ServerSettings, ServerSettingsPatch, ProjectSettingsOverrides, and PROJECT_SCOPED_SERVER_SETTING_KEYS.
Server, run start:RunExecutionService skips captureBaseline when the resolved project setting is off.
Server, run end:CheckpointCaptureService resolves the thread's project setting. When it's off, it skips baseline materialization and passes snapshot: false to CheckpointService.capture, which returns a missing checkpoint through the existing non-Git branch. The run still commits completed in the same command as before.
Clients:
Web/desktop: a Turn checkpoints switch in Source control, Repositories, which respects project scope, plus a settings search entry.
Mobile: the same switch in Server controls, Source control.
Docs: one sentence in docs/user/composer.md noting that file revert isn't offered when checkpoints are off.
Not changed: existing checkpoints and refs are left alone, and turning the setting back on resumes capture from the next turn.
Verification
CheckpointCaptureService.test.ts: new test "records a missing checkpoint without git when the project turns capture off". The project override is checkpointCapture: false. It asserts that baseline materialization is never called, that capture receives snapshot: false, and that the run ends completed.
RunExecutionService.test.ts: new test "starts the provider without a baseline when checkpoint capture is off". It asserts the provider starts and captureBaseline is called 0 times.
Both new tests fail on main without the source change (2 failed / 48 passed) and pass with it.
vp run check:changed: format, lint, knip, graphql, typecheck (30 packages) and tests (8 files) all pass.
Web settings checked against a sandboxed vp run dev (explicit --home-dir, empty database): the row renders in Source control, Repositories, toggles off, shows the reset button while off, and toggles back on.
Macroscope's review found this PR requires human approval — This PR adds a new per-project product setting that can suppress Git checkpoint creation, causing affected turns to lose snapshot-based diffs and rollback points while preserving the existing default-on path. The cross-layer runtime and settings-default changes warrant human review.
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Walkthrough
A project-scoped setting now controls checkpoint snapshots. Web and mobile settings expose the control. Server orchestration skips baseline and Git snapshot capture when the setting is disabled.
Changes: Turn Checkpoints
Layer / File(s)
Summary
Setting contract and controls packages/contracts/src/settings.ts, apps/web/src/components/settings/ProjectDefaultsSettings.tsx, apps/web/src/components/settings/settingsSearch.ts, apps/mobile/src/features/settings/SettingsServerControlsRouteScreen.tsx, docs/user/composer.md
Adds project-scoped checkpointCapture, defaulting to true, and exposes the “Turn checkpoints” control in web and mobile settings. The composer guidance describes rewind behavior when the setting is off.
Checkpoint capture resolves the project setting. When disabled, it skips baseline materialization and Git capture. Tests cover disabled capture and fallback to capture when settings cannot be read.
Root-run startup skips baseline capture when the setting is disabled. A test verifies provider startup proceeds without failed-run events or an error turn item.
pingdotgg/t3code#13996 — Disabling checkpoint capture can avoid a capture error, but this PR does not change client error handling.
pingdotgg/t3code#24083 — Disabling capture stops new checkpoint refs for a project, but this PR does not prune existing refs.
Suggested reviewers:juliusmarminge
Merge Risk: Minimal · up to 5092e
The checkpoint opt-out has no identified merge-blocking issue. A turn can still complete if the setting is re-enabled while it is running.
Pre-merge checks: 4
Check name
Status
Explanation
Title check
The title is concise, uses the conventional commit format, and clearly identifies the main change: adding a per-project setting to disable turn checkpoints.
Description check
The description includes complete Problem, Change, and Verification sections. It explains why the configuration option is appropriate, documents the affected components, reports focused tests and chec…
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 includes complete Problem, Change, and Verification sections. It explains why the configuration option is appropriate, documents the affected components, reports focused tests and checks, includes web screenshots, and states unverified areas.
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Actionable comments posted: 2
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Inline comments:
Review comments at
@apps/server/src/orchestration-v2/CheckpointCaptureService.ts:
- Around line 107-113: Add error recovery to the getSettings effect in the
checkpoint capture path so settings read or materialization failures default
checkpointCapture to true, allowing checkpoint completion to proceed. Update the
snapshot computation in CheckpointCaptureService while preserving the existing
project-specific setting when the read succeeds.
Review comments at @docs/user/composer.md:
- Around line 158-159: Update the turn-checkpoint documentation to state that
file restore remains available for earlier turns with an eligible checkpoint and
is unavailable only for turns without one; remove the implication that disabling
Turn checkpoints makes every thread rewind conversation only.
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size:M30-99 changed lines (additions + deletions).vouch:unvouchedPR author is not yet trusted in the VOUCHED list.
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Problem
Every turn takes a Git snapshot of the whole workspace before it starts and after it finishes, and the run stays in
waiting("Agent is working") until the after-turn snapshot commits. In a very large workspace that snapshot dominates the turn, and there is currently no way to opt a project out.Real case on Windows (nightly 0.1.3): one project is a Git repository with no commits, about 4.7 GB across roughly 60,000 files, most of them untracked generated assets. For turns in that project,
orchestrationV2.checkpointCapture.executetook 27.4 s at p50 and 30.3 s at max across 16 runs. Some captures hit the 30 s VCS process timeout and recordedmissing/errorcheckpoints. Over time that left about 1.9 GB of loose objects and straytmp_obj_*files in.git. Every other project on the same machine finishes turns in about 1 s. The provider'sresultarrives within milliseconds of the model's last token, so the whole delay is the snapshot. This affects every provider, since capture is per project, not per provider.This is the same
waitingwindow discussed in #15124 and #23079. Those cover what happens while capture stalls; this PR gives users of very large workspaces a way to not pay for capture at all.Why this fits the configuration-option route
Turn checkpoints are an established capability. T3 already records checkpoints as
missingwithout running Git for workspaces that aren't Git repositories, and every downstream consumer (turn diffs, rollback, the composer's revert options) already handles that state. This option only lets a user put a Git workspace on that existing path. It adds no new workflow and keeps the default on.Change
checkpointCapture(defaulttrue) toServerSettings,ServerSettingsPatch,ProjectSettingsOverrides, andPROJECT_SCOPED_SERVER_SETTING_KEYS.RunExecutionServiceskipscaptureBaselinewhen the resolved project setting is off.CheckpointCaptureServiceresolves the thread's project setting. When it's off, it skips baseline materialization and passessnapshot: falsetoCheckpointService.capture, which returns amissingcheckpoint through the existing non-Git branch. The run still commitscompletedin the same command as before.docs/user/composer.mdnoting that file revert isn't offered when checkpoints are off.Not changed: existing checkpoints and refs are left alone, and turning the setting back on resumes capture from the next turn.
Verification
CheckpointCaptureService.test.ts: new test "records a missing checkpoint without git when the project turns capture off". The project override ischeckpointCapture: false. It asserts that baseline materialization is never called, thatcapturereceivessnapshot: false, and that the run endscompleted.RunExecutionService.test.ts: new test "starts the provider without a baseline when checkpoint capture is off". It asserts the provider starts andcaptureBaselineis called 0 times.mainwithout the source change (2 failed / 48 passed) and pass with it.vp run check:changed: format, lint, knip, graphql, typecheck (30 packages) and tests (8 files) all pass.vp run dev(explicit--home-dir, empty database): the row renders in Source control, Repositories, toggles off, shows the reset button while off, and toggles back on.Screenshots (web, Settings, Source control, Repositories)
Before:
After (default, on):
After (turned off, reset button shown):
Not checked: the mobile row on a device or simulator, and a long-running project with real turns after flipping the switch.