/hub:merge — Merge Winner¶

Engineering - POWERFUL merge Source

Merge the best agent's branch into the base branch, archive losing branches via git tags, and clean up worktrees.

Usage¶

/hub:merge                                       # Merge winner of latest session
/hub:merge 20260317-143022                       # Merge winner of specific session
/hub:merge 20260317-143022 --agent agent-2       # Explicitly choose winner

What It Does¶

1. Identify Winner¶

If --agent specified, use that. Otherwise, use the #1 ranked agent from the most recent /hub:eval.

2. Merge Winner¶

git checkout {base_branch}
git merge --no-ff hub/{session-id}/{winner}/attempt-1 \
  -m "hub: merge {winner} from session {session-id}

Task: {task}
Winner: {winner}
Session: {session-id}"

3. Archive Losers¶

For each non-winning agent:

# Create archive tag (preserves commits forever)
git tag hub/archive/{session-id}/{agent-id} hub/{session-id}/{agent-id}/attempt-1

# Delete branch ref (commits preserved via tag)
git branch -D hub/{session-id}/{agent-id}/attempt-1

4. Clean Up Worktrees¶

python {skill_path}/scripts/session_manager.py --cleanup {session-id}

5. Post Merge Summary¶

Write .agenthub/board/results/merge-summary.md:

---
author: coordinator
timestamp: {now}
channel: results
---

## Merge Summary

- **Session**: {session-id}
- **Winner**: {winner}
- **Merged into**: {base_branch}
- **Archived**: {loser-1}, {loser-2}, ...
- **Worktrees cleaned**: {count}

6. Update State¶

python {skill_path}/scripts/session_manager.py --update {session-id} --state merged

Safety¶

Confirm with user before merging — show the diff summary first
Never force-push — merge is always --no-ff for clear history
Archive, don't delete — losing agents' commits are preserved via tags
Clean worktrees — don't leave orphan directories on disk

After Merge¶

Tell the user: - Winner merged into {base_branch} - Losers archived with tags hub/archive/{session-id}/agent-{N} - Worktrees cleaned up - Session state: merged