worktree

Purpose

Reusable git worktree lifecycle management. Creates isolated workspaces for parallel agent development, manages branch naming, handles cleanup after merge or abort. Extracted from team to be usable by any skill that needs workspace isolation.

Triggers

• Called by team (L1) for parallel stream isolation
• Called by cook (L1) when user explicitly requests worktree isolation
• /rune worktree create <name> — manual creation
• /rune worktree cleanup — manual cleanup of stale worktrees

Calls (outbound)

None — pure git operations via Bash.

Called By (inbound)

• team (L1): Phase 2 ASSIGN — create worktrees for parallel streams
• cook (L1): optional isolation for complex features
• User: direct invocation for manual worktree management

Operations

Create Worktree

Input: { name: string, base_branch?: string }
Default base: current HEAD

Steps:
1. Bash: git worktree add .claude/worktrees/<name> -b rune/<name> [base_branch]
2. Verify: Bash: git worktree list | grep <name>
3. Return: { path: ".claude/worktrees/<name>", branch: "rune/<name>" }

Naming convention:
  - Branch: rune/<name> (e.g., rune/stream-a, rune/auth-feature)
  - Path: .claude/worktrees/<name>
  - Max 3 active worktrees (enforced)

List Worktrees

Bash: git worktree list
→ Parse output into: [{ path, branch, commit }]
→ Filter: only rune/* branches (skip main worktree)

Cleanup Worktree

Input: { name: string, force?: boolean }

Steps:
1. Check if branch is merged: Bash: git branch --merged main | grep rune/<name>
2. If merged OR force:
   Bash: git worktree remove .claude/worktrees/<name> --force
   Bash: git branch -d rune/<name>  (or -D if force)
3. If NOT merged AND NOT force:
   WARN: "Branch rune/<name> has unmerged changes. Use force=true to remove."

Cleanup All Stale

Bash: git worktree list --porcelain
→ For each rune/* worktree:
  → Check if branch exists: git branch --list rune/<name>
  → If branch deleted: git worktree prune
  → If branch merged: cleanup (see above)
→ Report: removed [N] stale worktrees

Safety Rules

1. NEVER delete a worktree with uncommitted changes without user confirmation
2. NEVER force-delete an unmerged branch without user confirmation
3. MAX 3 active rune/* worktrees — refuse creation if limit reached
4. ALWAYS use .claude/worktrees/ directory — not project root
5. ALWAYS prefix branches with rune/ — easy identification and cleanup

Output Format

## Worktree Report
- **Action**: create | cleanup | list
- **Worktrees**: [count active]

### Active Worktrees
| Name | Branch | Path | Status |
|------|--------|------|--------|
| stream-a | rune/stream-a | .claude/worktrees/stream-a | active |
| stream-b | rune/stream-b | .claude/worktrees/stream-b | merged |

Constraints

1. MUST use .claude/worktrees/ directory for all worktrees
2. MUST prefix branches with rune/ namespace
3. MUST NOT exceed 3 active worktrees
4. MUST check for uncommitted changes before cleanup
5. MUST NOT force-delete unmerged branches without explicit user confirmation

Sharp Edges

Failure Mode	Severity	Mitigation
Worktree left behind after failed merge	MEDIUM	Cleanup All Stale operation + pre-team-merge tag for recovery
Branch name collision with existing branch	LOW	Check branch existence before creation, append timestamp if collision
Worktree path on Windows with long path	MEDIUM	Use short names, keep under .claude/worktrees/ to minimize path length
Deleting worktree with uncommitted agent work	HIGH	Safety Rule 1: always check for uncommitted changes first

Done When

• Worktree created/listed/cleaned up as requested
• Branch naming follows rune/ convention
• Active worktree count ≤ 3
• No stale worktrees left behind
• Worktree Report emitted

Cost Profile

~200-500 tokens. Haiku + Bash commands. Fast and cheap.