[devswha]

Refs #803.

Problem

Claude Code keeps files it writes outside the project in a per-session folder, <tmp>/claude-<uid>/<project>/<session>/scratchpad/, and names them in chat relative to that folder (scratchpad/upstream-pr.md). /api/fs/file resolved a relative path only against the pane's cwd (and filesNamed under it), so the link answered not_found.

Change

Built in, no setting. When the pane's folder has no such file and the pane runs Claude Code, the file route tries that session's temp folder:

• The folder comes from the transcript the chat already resolves (claudePaneSession): its folder name is <project> and its file name is <session>, so only the live session's folder is read, not every session of the same cwd. This avoids the ambiguity a {cwd-slug}/* glob would bring.
• claudeSessionTempDir looks under os.tmpdir() and /tmp, and only in a claude-<uid> folder this user owns (another user could create it first in a shared /tmp). On Windows there is no uid, so it is skipped.
• The lookup is locateFile again with that folder as base, so scratchpad/x.md and a bare x.md (via filesNamed) both work, and several matches come back as the usual ambiguous_path candidates.
• An absolute or ~ path, a pane that is not Claude, or a herdr error leaves today's not_found unchanged.

Testing

• server/claude-store.test.ts: the folder is found under the transcript's project. It is null with no folder, a base owned by another uid, a file name that is not a session id, or no uid.
• Live check on this PC against a running Claude Code pane: scratchpad/probe.md and probe.md resolve to the session's scratchpad file, while the pane cwd alone answers null.
• bun run typecheck, plus the server/scripts conventions tests, file-view and changelog-fold tests, pass.

🤖 Generated with Claude Code

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📝 Summary

Summary by CodeRabbit

• Bug Fixes
  • Relative file links opened from a Claude pane now also check the session’s temporary folder when the file isn’t found in the pane’s scratch folder. Existing behavior for absolute and home-directory paths is unchanged.

The server now locates Claude session temporary directories and uses them to retry filesystem lookups for eligible relative paths after an initial lookup fails. Tests cover session-directory lookup conditions, and a changelog entry records the fallback.

Changes: Claude session temp-file lookup

Layer / File(s)	Summary
Resolve Claude session temp directories server/claude-store.ts, server/claude-store.test.ts	The new lookup validates the UID and transcript name, checks candidate roots for the session directory, and returns null when the lookup conditions are not met. Tests cover successful and rejected lookups.
Retry eligible filesystem lookups server/index.ts, changelog.d/claude-scratchpad-links.md	The filesystem routes retry a failed lookup from the Claude session temp directory when the path is relative, does not begin with ~, and the request includes a pane ID and working directory. The changelog records this behavior.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Suggested reviewers: jiunshinn

Merge Risk: 🟡 Moderate · up to e85ac

A relative link can open a readable file outside the intended session folder. Constrain the fallback lookup before merging.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 60.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 3 files. (1 skipped: 1…	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Title check		The title clearly and concisely describes the main change: opening relative file links in a Claude Code session's scratch folder.
Description check		The description explains the problem, resulting behavior, implementation scope, security constraints, fallback conditions, and validation results. It uses a "Testing" heading instead of the template's…
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: Docstring Coverage

Explanation

Docstring coverage is 60.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 3 files. (1 skipped: 1 unsupported.)

✨ Finishing Touches: 💡 1

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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 @server/index.ts:
- Around line 2020-2026: Constrain the Claude temp-folder fallback in the
`locateFile` lookup so parent traversal cannot resolve outside the session
folder. Before calling `locateFile`, verify the resolved path remains within
`folder`, using path-separator-aware containment rather than a plain prefix
check.

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📥 Commits

Reviewing files that changed from the base of the PR and between 525cdcf and e85ac6f.

📒 Files selected for processing: 4

• changelog.d/claude-scratchpad-links.md
• server/claude-store.test.ts
• server/claude-store.ts
• server/index.ts

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