fix(server): GitHub PR lookups stop probing owner-qualified heads

[juliusmarminge]

Stacked on #13198.

Problem

For a branch that tracks a fork, or any remote other than origin, GitManager looked up its PR by probing gh pr list --head <owner>:<branch> and --head <remote>:<branch> before the bare branch name. gh pr list does not support that syntax: its help says "<owner>:<branch>" syntax not supported, and the source passes the value straight into GraphQL pullRequests(headRefName:). So both probes always came back empty, and each still cost a GraphQL call.

Tests hid this because the fake gh answered owner:branch keys, which real gh never does.

The open-PR probe on the bare name also used --limit 1. When another fork had a same-named branch (main, fix-typo, …), its PR could take the single slot, matchesBranchHeadContext would reject it, and the real PR went unseen.

Fix

• On GitHub, findOpenPr and findLatestPrForHeadContext drop selectors containing :. Git branch names cannot contain :, and the bare head branch is always among the selectors, so nothing is lost. matchesBranchHeadContext already checks the owner and repository.
• Other providers (GitLab, Bitbucket, Azure, Forgejo) parse owner:branch themselves and keep all their selectors.
• gh pr create --head owner:branch does support that syntax, so preferredHeadSelector is unchanged.
• GitHub head-branch probes (open and all-state) now read a full page of 100 instead of 1 or 20. That is still one request at the same GraphQL cost, and same-named branches on other forks can no longer crowd out the real match.
• Test fixtures now answer the bare branch name, as gh does, and the dead owner: decoys are gone.

Estimate

For every status or PR lookup on a fork or non-origin branch:

• open-PR lookup (stacked action, status refresh): 3 GraphQL calls become 1;
• all-states lookup (branch PR, status): 3 become 1, or 2 become 1 when the owner and the remote alias are the same.

Branches that track origin in the same repository are unaffected. How much this saves across the fleet depends on how many fork checkouts are open. For PR-review worktrees (t3code/pr-N/... tracking a contributor fork) every refresh cost two or three times what it needed to.

Verification

• vp test run src/git/GitManager.test.ts: 114 passed.
• apps/server typecheck is clean.

Made by Claude Opus 5.5 in Claude Code.

🤖 Generated with Claude Code

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Summary by CodeRabbit

• Bug Fixes
  • Improved GitHub pull-request lookup when multiple requests share a branch name, helping select the request associated with the correct branch.
  • Avoided treating ambiguous results as matches when identifying details are unavailable.
  • Preserved provider-specific lookup behavior.

[github-actions]

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	—	13.5 KiB	—	15.1 KiB	✅
Codex	Thread snapshot wire	—	7.1 KiB	—	7.3 KiB	✅
Codex	Live turn WebSocket wire	—	6.4 KiB	—	7.8 KiB	✅
Codex	Live turn WebSocket decoded	—	56.2 KiB	—	66.4 KiB	✅
Codex	Live turn messages	—	9	—	21	✅
Claude	Total thread wire	—	13.5 KiB	—	15.1 KiB	✅
Claude	Thread snapshot wire	—	7.1 KiB	—	7.3 KiB	✅
Claude	Live turn WebSocket wire	—	6.4 KiB	—	7.8 KiB	✅
Claude	Live turn WebSocket decoded	—	57.0 KiB	—	66.4 KiB	✅
Claude	Live turn messages	—	9	—	21	✅

Baseline: unavailable · PR result: 36211c8 · 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: 113.9 KiB
• Claude decoded thread snapshot: 114.6 KiB

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

[macroscopeapp]

Approvability

Verdict: Would Approve

Macroscope's review found this PR approvable — This is a small, well-scoped server-side fix that removes invalid GitHub PR probes, preserves other providers, and expands fork matching coverage with updated tests. A remaining high-severity finding reports that the limit of 10 can still miss a valid PR when many same-named PRs exist.

Not approved because:

• 1 blocking correctness issue found at or above your repo's Minimum Blocking Severity

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ℹ️ Recent review info

⚙️ Run configuration

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📥 Commits

Reviewing files that changed from the base of the PR and between ec1440f and 1f3c140.

📒 Files selected for processing (2)

• apps/server/src/git/GitManager.test.ts
• apps/server/src/git/GitManager.ts

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📝 Walkthrough

Walkthrough

GitManager filters colon-containing head selectors for GitHub pull-request lookups. Open pull-request lookup requests up to 10 results per selector and matches the returned pull requests against the existing head context. Tests cover bare-branch lookups and matching among same-named branches.

Changes

GitHub pull-request lookup

Layer / File(s)	Summary
Filter selectors and match pull requests apps/server/src/git/GitManager.ts, apps/server/src/git/GitManager.test.ts	GitManager excludes colon-containing selectors for GitHub and requests up to 10 open pull requests per selector. Tests cover bare-branch lookups, returned head matching, and related fork scenarios.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~15 minutes

Change: Bug fix

Suggested reviewers: t3dotgg

Merge Risk: ⚪ Minimal · up to 1f3c1

No actionable merge-blocking risk remains after normal checks.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 33.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly summarizes the main change: GitHub PR lookups no longer probe owner-qualified head selectors.
Description check	✅ Passed	The description explains the problem, the fix, and verification results. It covers the template’s What Changed and Why sections, and UI details are not applicable to these server changes. The Checklis…

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