Files
msd-core/.changeset/1342-worktree-guard-gsd-gate.md
Tom Boucher 07adeb50a0 fix(#1342): scope worktree-path-guard to GSD executor runs; fail open for no-repo targets (#1361)
* fix(#1342): scope worktree-path-guard to GSD executor runs; fail open for no-repo targets

The PreToolUse worktree-path-guard fired for any Write/Edit in any linked git
worktree, with no check for active GSD work — so Claude Code plan-mode writing
~/.claude/plans/<slug>.md from a manually-created worktree was hard-blocked.

- Gate enforcement on the GSD isolated-executor branch namespace
  (^worktree-agent-[A-Za-z0-9._/-]+$, per worktree-branch-check.md #2924); the
  guard is a no-op in non-GSD linked worktrees.
- Fail open when a target resolves to no git repository (e.g. ~/.claude/plans/)
  instead of blocking — that is not the #260 main-repo vector. A target inside
  a .git directory still blocks (git rev-parse --is-inside-git-dir).
- The #260 different-git-root hard block (escape to the main repo) is preserved.

Detached-HEAD executors no-op the gate; this is accepted because they are
fail-closed by worktree-branch-check.md (exit 42) before committing.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* chore(#1342): add changeset for worktree-path-guard scoping fix

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* test(#1342): build dot-dot traversal path portably (Windows drive-letter fix)

The traversal test built its file_path by stripping a leading slash from an
absolute externalDir and path.join-ing it after a `..` chain. On Windows the
drive letter (C:\) is not a leading slash, so it survived and path.resolve
produced an invalid doubled-drive path (C:\C:\Users\...), which resolves to no
git repo — the hook failed open (exit 0) and the test expected a block (exit 2).

Use path.relative(worktreeDir, externalTarget) + string concat so the file_path
carries literal `..` segments that resolve to externalTarget on both posix and
win32 (no drive doubling). Verified with path.win32/path.posix.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
2026-06-17 08:50:28 -04:00

639 B

type, pr
type pr
Fixed 1361

The worktree path guard no longer blocks ordinary writes in non-GSD git worktrees — the gsd-worktree-path-guard PreToolUse hook fired for every Write/Edit in any linked git worktree, so Claude Code plan-mode writing its plan to ~/.claude/plans/<slug>.md from a manually-created worktree was hard-blocked. The hook now only enforces inside a GSD isolated-executor worktree (branch worktree-agent-*) and fails open when a target resolves to no git repository, while still blocking writes that escape to a different git root (the #260 protection) or into a repository's .git internals. (#1342)