Method worktreeMismatchFor

src/mcp/tools.ts:1167–1194

* Cached git worktree/index mismatch for a tool call's effective project. * * The "effective project" is what the request targets: an explicit * `projectPath` arg, else the directory the server resolved its default * project from (`defaultProjectHint`), else cwd. Memoized per start path

(projectPath?: string)

   * broken by this check.
   */
  private worktreeMismatchFor(projectPath?: string): WorktreeIndexMismatch | null {
    const startPath = projectPath ?? this.defaultProjectHint ?? process.cwd();

    // The verdict depends on BOTH the start path AND the index root it resolves
    // to, so the cache must be keyed on the pair. Resolve the index root first
    // (cheap — getCodeGraph re-walks to the nearest .codegraph/, no git), then
    // key on `(startPath, indexRoot)`. The moment that root changes — most
    // importantly when a git worktree gains its own index and the walk-up stops
    // there instead of at the parent checkout — the key changes and the verdict
    // is recomputed, instead of serving the stale "borrowed the parent's index"
    // warning for the server's whole lifetime. Keying on startPath alone pinned
    // that first verdict until restart (#926).
    let indexRoot: string;
    try {
      indexRoot = this.getCodeGraph(projectPath).getProjectRoot();
    } catch {
      // No resolvable project (or any other resolution error) → nothing to warn.
      return null;
    }

    const cacheKey = `${startPath}\u0000${indexRoot}`;
    const cached = this.worktreeMismatchCache.get(cacheKey);
    if (cached !== undefined) return cached;

    const mismatch = detectWorktreeIndexMismatch(startPath, indexRoot);
    this.worktreeMismatchCache.set(cacheKey, mismatch);
    return mismatch;
  }

  /**
   * Prefix a successful read-tool result with a compact worktree-mismatch