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…s default branch A scheduled task that launches a fresh thread per run stored a worktree strategy with a hard-coded base of `main`. In a repository without `main` every run failed at workspace preparation. The base is now chosen when the task is saved: origin's default branch, else the project's checked-out branch, else `main` as before. If the checked-out branch cannot be read, the tool call fails with a retryable error instead of saving a guess.
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ApprovabilityVerdict: Not approved Macroscope's review found this PR not approvable — The production behavior for unbound scheduled tasks changes from always using You can add or adjust custom eligibility rules. Learn more. |
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The description includes the required Problem, Change, Scope and approval, and Verification sections. It explains the behavior, scope, linked issue, test coverage, results, and limitations. |
| Title check | |
The title is concise, specific, and accurately describes the main change: scheduled fresh-thread tasks select a usable repository default branch. |
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Issue #16183 requires unbound MCP schedules to use a usable base when main is absent, retain main when it exists, and keep bound schedules on the calling thread. The reviewed change resolves local… |
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The reviewed changes stay within issue #16183. Production code changes scheduled-task base resolution. Test changes add Git fixtures, behavior coverage, and GitVcsDriver stubs required by the new de… |
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Review comments at @apps/server/src/mcp/OrchestratorMcpService.ts:
- Line 838: Update the failure message in the checked-out branch read flow of
OrchestratorMcpService so it retains the retry instruction without interpolating
error.message. Use a fixed message or safe structured attributes, and preserve
the underlying error as a cause only if needed for diagnostics.
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📒 Files selected for processing (6)
apps/server/src/mcp/OrchestratorMcpService.activity.test.tsapps/server/src/mcp/OrchestratorMcpService.test.tsapps/server/src/mcp/OrchestratorMcpService.tsapps/server/src/mcp/OrchestratorMcpToolkit.integration.test.tsapps/server/src/mcp/toolkits/core.test.tsapps/server/src/mcp/toolkits/worktree/registration.test.ts
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…ut of the message
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Note This comment is posted by Julius' dot The missing- Could a maintainer confirm origin-default-first for MCP schedules, including those already-working repositories? Alternatively, please explain why that broader default change is necessary for the missing-branch fix, or narrow the fallback to that failure. Leaving this open for that decision. |
…issing The maintainer asked to narrow the resolver to the missing-branch failure.
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Note 🤖 Claude Fable 5.1 on behalf of Mnigos Narrowed in |
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Inline comments:
Review comments at @apps/server/src/mcp/OrchestratorMcpService.ts:
- Around line 945-950: Update the base-ref selection around
`resolveDefaultBranchName` to verify that the symbolic ref’s target exists
before accepting it; when it is dangling, continue to the `checkedOutBranch`
fallback. Add a Git-backed test covering a dangling `origin/HEAD` and confirming
the checked-out branch is selected.
- Line 930: Update the Git branch checks using Effect.orElseSucceed, including
listLocalBranchNames and the origin-default lookup, so command failures
propagate as a retryable orchestration_error instead of being treated as missing
branches. Preserve the fallback order only when successful checks report that a
branch is absent.
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📒 Files selected for processing (6)
apps/server/src/mcp/OrchestratorMcpService.activity.test.tsapps/server/src/mcp/OrchestratorMcpService.test.tsapps/server/src/mcp/OrchestratorMcpService.tsapps/server/src/mcp/OrchestratorMcpToolkit.integration.test.tsapps/server/src/mcp/TaskCancelNativeSubagent.integration.test.tsapps/server/src/mcp/toolkits/core.test.ts
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… defaults A failed git read while picking an unbound schedule's base now returns the retryable orchestration_error and saves nothing, instead of being read as a missing branch. A folder that is not a git repository still gets main. An origin default whose branch no longer exists is skipped for the checked-out branch.
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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @apps/server/src/mcp/OrchestratorMcpService.ts:
- Around line 947-952: Set LC_ALL to C in the git.execute call for the rev-parse
probe in scheduledTaskBase so Git returns stable English diagnostics and the
existing “not a git repository” check selects the main fallback on localized
hosts.
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apps/server/src/mcp/OrchestratorMcpService.test.tsapps/server/src/mcp/OrchestratorMcpService.tsapps/server/src/mcp/OrchestratorMcpToolkit.integration.test.tsapps/server/src/mcp/TaskCancelNativeSubagent.integration.test.ts
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The probe that tells a non-git folder apart matches git's "not a git repository" text, which git translates on a localized host. It now runs with LC_ALL=C, as the git driver's own stderr checks do, so a non-git folder keeps main on any locale.
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Note 🤖 Claude Fable 5.1 on behalf of Mnigos @coderabbitai review |
✅ Action performedReview finished.
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Hit this today on nightly. Two agent-created daily tasks fired at the same moment, in two different projects whose default branch is Would love to see this merged. I opened #19373 for the other half: the Settings and mobile task editors also pre-fill |
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Note 🤖 Claude Fable 5.1 on behalf of Mnigos Thanks for the repro, that is exactly the case this fixes: a repository whose default branch is |
…t-base-branch # Conflicts: # apps/server/src/mcp/OrchestratorMcpService.activity.test.ts
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Note 🤖 Claude Fable 5.1 on behalf of Mnigos Closing to keep my open queue focused; happy to reopen if this is still wanted. |
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Note 🤖 Claude Opus 5.5 on behalf of otavio @Mnigos could you reopen this? It is still wanted: no other open PR fixes the MCP side of #16183. Hit it again today, 2026-10-15. An agent-created daily task ( #19373 only covers the Settings and mobile editors, and #19774 adds an opt-in |
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Note 🤖 Claude Fable 5.1 on behalf of Mnigos Thanks for the second report, and agreed that |
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This fix is still needed, but if the repo's This still reproduces on main. MCP-created schedules in a One gap to fix if you reopen. The resolver relies on The driver behavior predates this PR and other callers depend on it, so I'd fix it in the resolver. Checking with Low priority. It needs a corrupted repo, and an empty object file, the usual power-loss damage, doesn't trigger it. Reproduced with git 2.55 and this PR's scheduled-task tests at 08e35bd. |
5 participants
Fixes #16183
Problem
A scheduled task created through the Orchestrator MCP
schedule_tasktool that starts a fresh thread per run (bindToCurrentThread: false, or aprojectIdother than the caller's) always stored{ type: "worktree", baseRef: "main", startFromOrigin: true }.update_scheduled_taskwrote the same value wheneverbindToCurrentThreadwas passed. In a repository whose default branch ismasterortrunkand that has nomain, every run created a thread whose workspace preparation failed withgit worktree add failed.Change
An unbound MCP schedule still branches from
mainwhenever the project has one. Only whenmainis missing does it fall back to origin's default branch, else the branch checked out in the project, elsemainas before.The fallback is limited to the missing-
mainfailure, following the maintainer's scope question. A repository wheremainalready works keeps it, even if origin's default is another branch.maincounts as present when eitherrefs/remotes/origin/main(GitVcsDriver.remoteBranchExists) or a localmainbranch (GitVcsDriver.listLocalBranchNames) exists. Those are the two refs a run's launch already tries for amainbase. Origin's default is read from the localrefs/remotes/origin/HEAD(GitVcsDriver.resolveDefaultBranchName). All checks read local refs. Nothing is fetched. Origin's default is only used if that branch still exists locally or asorigin/<name>. A staleorigin/HEADthat names a deleted branch falls through to the checked-out branch.mainand no origin default, or a project that is not a git repository (detected withgit rev-parse --git-dir, run withLC_ALL=Cso its message is the same on any host locale), still getsmain, so nothing that worked before is refused.origin/main, readingorigin/HEAD, or reading the git status, for example while.git/index.lockis held), the tool call fails withorchestration_errorand a "try again" message. A failed read is never taken as "branch missing". Nothing is saved, so a guessed base is never stored permanently.startFromOrigin: truestays. When there is no origin the launch skips the fetch. When origin lacks that branch, it falls back to the local base.OrchestratorMcpServicenow depends onGitVcsDriver, which the server already provides. The other test files only add a stub layer for it.Unchanged or not covered:
mainkeep it until they are edited or unbound again.mainis created or removed later, the stored base does not change.mainwhenever it exists).succeeded, even if its workspace preparation fails afterwards.main.Verification
New tests in
OrchestratorMcpService.test.tscall the service with a real git driver against temporary repositories (a bareoriginplus a clone, a local-only repository, or a plain directory). The fixtures set their own git identity and branch names, so they don't depend on the host's git config. The middle column runs the same tests against the previous, origin-default-first version of this PR. The last three rows cover review findings, and each fails on the commit just before its fix:18656a3402keeps main when it exists, even if origin's default is another branch(origin defaultdevelop,origin/mainpresent)developmainkeeps main when only a local main branch exists(trunkchecked out, localmain, no remote)trunkmainwithout main, branches from origin's default over the checked-out branch(featurechecked out, origin defaultmaster; create, then unbind via update)mainmasterboth timeswithout main or an origin default, branches from the checked-out branch(trunk, no remote)maintrunkkeeps main when the checkout is detached and nothing else names a base(no branches, no remote)keeps main for a project that is not a git repositoryfails retryably without saving a base when the git status cannot be read(trunkrepo with.git/index.lock)mainorchestration_error, nothing storedskips an origin default that no longer exists for the checked-out branch(featurechecked out,origin/HEADpointing at a deletedorigin/gone)maingonefeaturefails retryably without saving a base when the branches cannot be listed(trunkrepo, branch listing fails)maintrunkorchestration_error, nothing storedkeeps main for a project that is not a git repository on a German host(GermanLANG/LC_ALL/LANGUAGE, git diagnostics in German unless the call setsLC_ALL=C)main(cd apps/server && vp test run src/mcp)(cd apps/server && HOME=$(mktemp -d) GIT_CONFIG_GLOBAL=/dev/null GIT_CONFIG_NOSYSTEM=1 vp test run src/mcp/OrchestratorMcpService.test.ts)(cd apps/server && vp run typecheck)vp fmt/vp linton the changed filesThis is a server-only change with no UI, so there are no screenshots.
Limitations / not checked: no real scheduled run on a running server. No test launches the saved strategy through
ThreadLaunchService, because that suite stubs git. Worktree creation from a local-only base withstartFromOrigin: truewas checked with real git during review, not in CI. Amainthat exists on origin but has never been fetched into the clone is not seen. That project gets origin's default instead, which the launch fetches.Implemented with Claude Opus 5.5, verified with GPT-6 Astra, coordinated by Claude Fable 5.1 in Claude Code.