Merge

---
name: compose:merge
hidden: true
description: Use when implementation is complete, all tests pass, and you need to decide how to integrate the work - guides completion of development work by presenting structured options for merge, PR, or cleanup
---

# Finishing a Development Branch

## Overview

Guide completion of development work by presenting clear options and handling chosen workflow.

**Core principle:** Verify tests → Detect environment → Present options → Execute choice → Clean up.

**Announce at start:** "I'm using the compose:merge skill to complete this work."

## The Process

### Step 1: Verify Tests

**Before presenting options, verify tests pass:**

```bash
# Run project's test suite
npm test / cargo test / pytest / go test ./...
```

**If tests fail:**
```
Tests failing (<N> failures). Must fix before completing:

[Show failures]

Cannot proceed with merge/PR until tests pass.
```

Stop. Don't proceed to Step 2.

**If tests pass:** Continue to Step 2.

### Step 2: Detect Environment

**Determine workspace state before presenting options:**

```bash
GIT_DIR=$(cd "$(git rev-parse --git-dir)" 2>/dev/null && pwd -P)
GIT_COMMON=$(cd "$(git rev-parse --git-common-dir)" 2>/dev/null && pwd -P)
```

This determines which menu to show and how cleanup works:

| State | Menu | Cleanup |
|-------|------|---------|
| `GIT_DIR == GIT_COMMON` (normal repo) | Standard 4 options | No worktree to clean up |
| `GIT_DIR != GIT_COMMON`, named branch | Standard 4 options | Provenance-based (see Step 6) |
| `GIT_DIR != GIT_COMMON`, detached HEAD | Reduced 3 options (no merge) | No cleanup (externally managed) |

### Step 3: Determine Base Branch

```bash
# Try common base branches
git merge-base HEAD main 2>/dev/null || git merge-base HEAD master 2>/dev/null
```

If the base branch is ambiguous, confirm through `compose:ask`:
- header: `Base Branch`
- question: `This branch appears to have split from <detected>. Correct?`
- options:
  - label: `Yes, <detected>`, description: `Use <detected> as merge target`
  - label: `Different branch`, description: `I'll specify the correct base branch`

If no user is available, use the detected base branch and proceed.

### Step 4: Present Options

**Normal repo / named-branch worktree — use `compose:ask`:**
- header: `Complete Work`
- question: `Implementation complete. What would you like to do?`
- options:
  - label: `Merge locally`, description: `Merge back to <base-branch>`
  - label: `Create PR`, description: `Push branch and open a Pull Request`
  - label: `Keep as-is`, description: `Leave the branch — I'll handle it later`
  - label: `Discard`, description: `Delete branch and all commits`

If no user is available, merge locally and proceed.

**Detached HEAD — use `compose:ask`:**
- header: `Complete Work`
- question: `Implementation complete (detached HEAD, externally managed). What would you like to do?`
- options:
  - label: `Create PR`, description: `Push as new branch and open a PR`
  - label: `Keep as-is`, description: `Leave as-is — I'll handle it later`
  - label: `Discard`, description: `Delete this work permanently`

If no user is available, create a PR and proceed.

### Step 5: Execute Choice

#### Option 1: Merge Locally

```bash
# Get main repo root for CWD safety
MAIN_ROOT=$(git -C "$(git rev-parse --git-common-dir)/.." rev-parse --show-toplevel)
cd "$MAIN_ROOT"

# Merge first — verify success before removing anything
git checkout <base-branch>
git pull
git merge <feature-branch>

# Verify tests on merged result
<test command>

# Only after merge succeeds: cleanup worktree (Step 6), then delete branch
```

Then: Cleanup worktree (Step 6), then delete branch:

```bash
git branch -d <feature-branch>
```

#### Option 2: Push and Create PR

```bash
# Push branch
git push -u origin <feature-branch>

# Create PR
gh pr create --title "<title>" --body "$(cat <<'EOF'
## Summary
<2-3 bullets of what changed>

## Test Plan
- [ ] <verification steps>
EOF
)"
```

**Do NOT clean up worktree** — user needs it alive to iterate on PR feedback.

#### Option 3: Keep As-Is

Report: "Keeping branch <name>. Worktree preserved at <path>."

**Don't cleanup worktree.**

#### Option 4: Discard

**Confirm through `compose:ask`:**
- header: `Confirm Discard`
- question: `This will permanently delete branch <name>, all commits, and worktree at <path>. Are you sure?`
- options:
  - label: `Cancel`, description: `Keep branch and worktree intact`
  - label: `Discard permanently`, description: `Cannot be undone`

If no user is available, do NOT discard — keep the branch as-is. (Destructive actions never auto-approve; see `compose:ask`.)

Only proceed if user selected "Discard permanently". If "Cancel", return to Step 4.

If confirmed:
```bash
MAIN_ROOT=$(git -C "$(git rev-parse --git-common-dir)/.." rev-parse --show-toplevel)
cd "$MAIN_ROOT"
```

Then: Cleanup worktree (Step 6), then force-delete branch:
```bash
git branch -D <feature-branch>
```

### Step 6: Cleanup Workspace

**Only runs for Options 1 and 4.** Options 2 and 3 always preserve the worktree.

```bash
GIT_DIR=$(cd "$(git rev-parse --git-dir)" 2>/dev/null && pwd -P)
GIT_COMMON=$(cd "$(git rev-parse --git-common-dir)" 2>/dev/null && pwd -P)
WORKTREE_PATH=$(git rev-parse --show-toplevel)
```

**If `GIT_DIR == GIT_COMMON`:** Normal repo, no worktree to clean up. Done.

**If worktree path is under `.worktrees/`, `worktrees/`, or `~/.config/compose/worktrees/`:** Compose created this worktree — we own cleanup.

```bash
MAIN_ROOT=$(git -C "$(git rev-parse --git-common-dir)/.." rev-parse --show-toplevel)
cd "$MAIN_ROOT"
git worktree remove "$WORKTREE_PATH"
git worktree prune  # Self-healing: clean up any stale registrations
```

**Otherwise:** The host environment (harness) owns this workspace. Do NOT remove it. If your platform provides a workspace-exit tool, use it. Otherwise, leave the workspace in place.

## Quick Reference

| Option | Merge | Push | Keep Worktree | Cleanup Branch |
|--------|-------|------|---------------|----------------|
| 1. Merge locally | yes | - | - | yes |
| 2. Create PR | - | yes | yes | - |
| 3. Keep as-is | - | - | yes | - |
| 4. Discard | - | - | - | yes (force) |

## Common Mistakes

**Skipping test verification**
- **Problem:** Merge broken code, create failing PR
- **Fix:** Always verify tests before offering options

**Open-ended questions**
- **Problem:** "What should I do next?" is ambiguous
- **Fix:** Present exactly 4 structured options (or 3 for detached HEAD)

**Cleaning up worktree for Option 2**
- **Problem:** Remove worktree user needs for PR iteration
- **Fix:** Only cleanup for Options 1 and 4

**Deleting branch before removing worktree**
- **Problem:** `git branch -d` fails because worktree still references the branch
- **Fix:** Merge first, remove worktree, then delete branch

**Running git worktree remove from inside the worktree**
- **Problem:** Command fails silently when CWD is inside the worktree being removed
- **Fix:** Always `cd` to main repo root before `git worktree remove`

**Cleaning up harness-owned worktrees**
- **Problem:** Removing a worktree the harness created causes phantom state
- **Fix:** Only clean up worktrees under `.worktrees/`, `worktrees/`, or `~/.config/compose/worktrees/`

**No confirmation for discard**
- **Problem:** Accidentally delete work
- **Fix:** Require typed "discard" confirmation

## Red Flags

**Never:**
- Proceed with failing tests
- Merge without verifying tests on result
- Delete work without confirmation
- Force-push without explicit request
- Remove a worktree before confirming merge success
- Clean up worktrees you didn't create (provenance check)
- Run `git worktree remove` from inside the worktree

**Always:**
- Verify tests before offering options
- Detect environment before presenting menu
- Present exactly 4 options (or 3 for detached HEAD)
- Get typed confirmation for Option 4
- Clean up worktree for Options 1 & 4 only
- `cd` to main repo root before worktree removal
- Run `git worktree prune` after removal