[patrickleet]

Problem and solution

Implicit worktree command scoping needs repository paths, but discovery previously read every member's branch before dispatch. Background consumers that subsequently observe Git paid for redundant subprocess work.

Separate metadata membership from branch observation. Existing branch-enriched discovery APIs retain their behavior; implicit scoping uses metadata-only paths. Also expose a path-only enclosing-set location hint, allowing commands to select a set before validating it. A malformed selected set then produces an error instead of being mistaken for absent context.

Before and after usage

Rust topology consumers can replace:

let repos = meta_cli::worktree::discover_worktree_repos_recursive(task_dir)?;

with:

let members = meta_cli::worktree::discover_worktree_members_recursive(task_dir)?;
for member in members {
    println!("{}: {}", member.alias, member.path.display());
}

task_dir is a &std::path::Path for the realized set. WorktreeMemberInfo contains alias, path, and source_path. Use discover_worktree_members for legacy traversal boundaries. detect_worktree_location(cwd) returns only the enclosing name/path hint; it does not certify valid membership. detect_worktree_context continues to validate discovery before returning paths.

The public CLI consumer in meta_git_cli #29 exposes:

meta git worktree list example --recursive --metadata-only --json
# Inside .worktrees/example or a descendant:
meta git worktree list --recursive --metadata-only --json

Correctness and validation

Strict recursive membership includes nested realized repositories, validates Git metadata/backlinks, excludes hidden directories and directory symlinks, and rejects traversal failures or the two-million-entry budget instead of returning partial success. Branch-enriched list/status consumers retain branch behavior unless they explicitly select metadata-only output.

101 library tests passed; formatting and strict all-target Clippy passed. Companion public protocol tests prove zero Git calls using a denying executable, verify selected malformed roots fail rather than fall back, and preserve observed list/status output. Installed explicit/inferred discovery returns identical 14-member output in the real Harmony worktree.

Land this library change before the plugin change. ATC #554 collects Git facts separately from metadata-only list discovery. These changes reduce workload; they do not establish a fix for the macOS SystemPolicy kernel panic.

Tracked by [[tasks/harmony-2613]].

Summary by CodeRabbit

• Bug Fixes
  • Worktree commands now continue through normal configuration lookup when no member repositories are found, rather than treating the directory as an active worktree.
  • Invalid Git metadata in a worktree is reported before the requested command runs.
• Improvements
  • Worktree discovery now identifies member repositories separately from the worktree location, helping keep repository details accurate.

Review correction

Commit 9de045f moves CLI dispatch to the path-only context hint followed by fallible membership discovery. Discovery errors propagate before ordinary meta-config fallback; a successful empty discovery retains the existing fallback. The executable regression supplies malformed worktree metadata beside otherwise valid configs and proves no command is dispatched. All 17 CLI integration tests and strict all-target Clippy passed.

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Walkthrough

Worktree location detection now returns a task name and directory separately from membership discovery. Membership discovery returns member records without branch state. Repository discovery adds the current branch, or HEAD when unavailable. Command dispatch uses discovered member paths when available.

Changes

Worktree discovery

Layer / File(s)	Summary
Membership records and traversal src/worktree.rs	Adds WorktreeMemberInfo and membership discovery functions. Legacy and recursive discovery record member paths and aliases without probing branch state.
Branch-enriched discovery and context src/worktree.rs, src/main.rs, tests/plugin_git.rs	Repository discovery maps membership records to records with branch information. Context detection separately detects the worktree location and discovers members. Command dispatch proceeds with worktree handling only when member paths are found. Tests check context data, membership serialization, and failure on malformed .git metadata before command dispatch.

Priority: ➖ Normal

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

Change: Bug fix

Merge Risk: ⚪ Minimal · up to 9de04

No merge-blocking issue is established; the change is ready for normal merge checks.

Pre-merge checks: 5

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the main change: separating metadata discovery from Git branch probes during worktree handling.
Docstring Coverage		Docstring coverage is 84.62% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 13 functions across 3 files.
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.

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_{A rabbit checks the paths with care,
Finds member names without branch flair.
When branch details come into view,
It adds the branch, or HEAD will do.
The task and root are kept apart,
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Actionable comments posted: 1

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Inline comments:
Review comments at @src/worktree.rs:
- Around line 31-38: Update the worktree detection boundary to use
detect_worktree_location, then call discover_worktree_members with error
propagation instead of converting failures to None. Preserve the ordinary
fallback only when discovery succeeds with no members.

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