fix(web): link pull requests to threads in folders that aren't Git repos

[shivamhwp]

Problem

If your project is a folder that holds several repos but isn't a Git repo itself, you can't link a PR to a thread. Right-clicking a PR link only offers "Open in system browser" and "Copy Link", with no "Link to thread". The Link pull request dialog refuses the URL the same way. So the thread never shows the PR and never settles when it merges (#9435).

The web client only offered linking when some project in the environment had a repository identity on the PR's host. A non-Git parent folder has none, so if it's your only project on that host, linking is never offered.

Change

The server already accepts this. thread.pull-request.link stores the link by host, repository, and number with no project check, and the MCP link_pull_request tool takes any full URL. Only the client gate was stale.

usePullRequestLinking now decides through a small canLinkChangeRequest(mode, projects, parsed). In multi-link mode (threadPullRequests, which current servers advertise) any recognized PR URL can be linked. Older single-link servers still need a matching project, because that link stores a projectId. The Link pull request dialog's description no longer says the URL must be on a host with a project.

Every "Link to thread" entry point goes through canLink: the right-click menu on a PR link, the PR panel's "Link to this thread", and the Link pull request dialog. Desktop uses the web client. Mobile has no link-by-URL UI.

PR status sync is unchanged. If no project can read the PR's host, the link shows as pending, the same as any freshly linked PR before its first sync.

This rebuilds the linking part of #9440 by @Gigioxx on current main. The V1 code it changed is gone, so no code carried over.

Scope and approval

A small, focused fix for an obvious bug. One client gate decided linking, and the server and MCP paths already allowed it. Closes #9435.

Verification

Reproduced in the real web app on a fresh environment whose only project is /tmp/multi-repo (two Git repos inside, not a repo itself). The agent replies with a link to react/react#31000.

Before (main 1e2ecbd): right-clicking the link shows "Open in system browser" and "Copy Link" only.

9440-before.mp4

After (this PR): the menu offers "Link to thread". Clicking it links the PR, and the sidebar row shows #31000.

9440-after.mp4

Main does offer "Link to thread" as soon as any project is a GitHub repo, which is why this only hits environments without one.

Focused tests: vp test run apps/web/src/hooks/usePullRequestLinking.test.ts apps/web/src/components/pullRequest

• New usePullRequestLinking.test.ts covers multi-link with no projects, single-link with and without a matching project, and unsupported servers. All 3 tests fail without the fix.
• With the fix: 22 files, 463 tests passed. tsc --noEmit -p apps/web is clean.

Not checked: GitLab and other hosts in the real app. They go through the same gate.

Made with Claude Opus 5.5 in Claude Code (T3 Code).

🤖 Generated with Claude Code

[macroscopeapp]

Approvability

Verdict: Approved at 5518c39

Macroscope's review found this PR approvable — This is a contained client-side bug fix that enables an existing PR-linking flow for non-Git workspace folders while preserving legacy-server safeguards. The accompanying changes are limited to explanatory copy and focused tests, with no schema, deployment, security, billing, or static-analysis configuration impact.

No code changes detected at f969ff1. Prior analysis still applies.

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

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📥 Commits

Reviewing files that changed from the base of the PR and between a9111a2 and 5518c39.

📒 Files selected for processing (1)

• apps/web/src/components/pullRequest/LinkPullRequestDialog.tsx

🚧 Files skipped from review as they are similar to previous changes (1)

• apps/web/src/components/pullRequest/LinkPullRequestDialog.tsx

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📝 Walkthrough

Walkthrough

Multiple-link mode now permits linking a parsed pull request URL without a matching environment project. Single-link mode still requires a matching project, and unsupported modes reject linking. The dialog distinguishes URL links from bare numbers for the thread’s repository.

Changes

Pull request linking

Layer / File(s)	Summary
Link eligibility and dialog guidance apps/web/src/hooks/usePullRequestLinking.ts, apps/web/src/hooks/usePullRequestLinking.test.ts, apps/web/src/components/pullRequest/LinkPullRequestDialog.tsx	The exported canLinkChangeRequest helper allows multiple-link mode without project matching, requires a matching project in single-link mode, and rejects unsupported modes. The hook delegates to this helper. Tests cover the eligibility rules. The dialog describes URLs as carrying their host and repository, while bare numbers refer to the thread’s repository.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix · Severity of issue fixed: Medium

Merge Risk: ⚪ Minimal · up to 5518c

The change is mergeable after normal checks. PR links can be added without a matching project; their status may remain pending until a project can read the PR host.

Security Architecture Review

Security architecture risk: 🔵 Low · up to a9111

The change broadens which URLs users can attach, while existing authorization, repository-routing checks, and older-server restrictions remain in place. Links without an available repository route remain pending rather than gaining access. No introduced security issue was established, but end-to-end failure and credential behavior were not fully verified.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The supported exposure is broader attachment of PR identities to threads in an authenticated environment. Synchronization can share metadata among threads linked to the same PR, but remote reads remain routed through existing supported workspace projects. The change does not itself supply credentials or grant repository write authority.

Trust Boundaries and Controls

• observed — Websocket intake authenticates the connection and applies session scopes. Command dispatch requires the orchestration operate scope. Provider routing rejects references without a supported route; same-host cross-repository routing already exists, while Azure routing requires matching repository identity. These controls predate this PR.

Resilience and Maintainability Implications

• observed — Failed provider reads are contained to the synchronization group, and null snapshots remain eligible for periodic retry. A visible pending or open link blocks automatic settlement rather than being treated as merged. Command receipts also prevent replaying an accepted command ID against another thread. These checks bound failure effects, although complete transaction and concurrency behavior was not verified.

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Linked Issues check	⚠️ Warning	[#9435] canLinkChangeRequest now allows parsed URLs in multi-link mode without a matching project. The new tests cover this gate, and the reported reproduction shows PR #31000 in the sidebar. Howeve…	Support status syncing for URL-linked PRs without a matching project, or associate the link with a project that can read the PR. Add automated coverage that verifies the sidebar shows the PR state and that merge-driven settlement works.
Docstring Coverage	⚠️ Warning	Docstring coverage is 75.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 3 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the fix: enabling pull-request links for threads in folders that are not Git repositories.
Description check	✅ Passed	The description covers the problem, change, scope rationale, and focused verification. It includes before-and-after UI evidence and states that other hosts were not checked. It does not report whether…
Out of Scope Changes check	✅ Passed	The gate change, dialog text, and focused tests all support [#9435]. The reviewed diff contains no demonstrated unrelated changes.

Full details: Linked Issues check

Explanation

[#9435] canLinkChangeRequest now allows parsed URLs in multi-link mode without a matching project. The new tests cover this gate, and the reported reproduction shows PR #31000 in the sidebar. However, the PR description says that without a project able to read the host, the link remains pending and status sync is unchanged. This does not establish the linked PR state or the merge-driven settlement required by the issue.

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Actionable comments posted: 1

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Inline comments:
Review comments at
@apps/web/src/components/pullRequest/LinkPullRequestDialog.tsx:
- Line 206: Update the LinkPullRequestDialog description to avoid promising that
full URLs can point to any repository; qualify the guidance by linking mode or
use wording that remains accurate when linking.canLink requires an environment
project match in single mode.

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ℹ️ Review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 250e052 and a9111a2.

📒 Files selected for processing (3)

• apps/web/src/components/pullRequest/LinkPullRequestDialog.tsx
• apps/web/src/hooks/usePullRequestLinking.test.ts
• apps/web/src/hooks/usePullRequestLinking.ts

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Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	5.0 KiB	5.0 KiB	0 B (0.0%)	6.8 KiB	✅
Codex	Thread snapshot wire	3.8 KiB	3.8 KiB	0 B (0.0%)	4.9 KiB	✅
Codex	Live turn WebSocket wire	1.2 KiB	1.2 KiB	0 B (0.0%)	2.0 KiB	✅
Codex	Live turn WebSocket decoded	20.9 KiB	20.9 KiB	0 B (0.0%)	29.3 KiB	✅
Codex	Live turn messages	2	2	0 (0.0%)	8	✅
Claude	Total thread wire	5.0 KiB	5.0 KiB	0 B (0.0%)	6.8 KiB	✅
Claude	Thread snapshot wire	3.8 KiB	3.8 KiB	0 B (0.0%)	4.9 KiB	✅
Claude	Live turn WebSocket wire	1.2 KiB	1.2 KiB	0 B (0.0%)	2.0 KiB	✅
Claude	Live turn WebSocket decoded	21.2 KiB	21.2 KiB	0 B (0.0%)	29.3 KiB	✅
Claude	Live turn messages	2	2	0 (0.0%)	8	✅

Baseline: 5e22256 · PR result: f969ff1 · 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 5518c39