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name: Auto-Spawn Mergemaster on Move to Merge
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# Story 63: Auto-Spawn Mergemaster on Move to Merge

## User Story

As an agent completing work on a story, when I call `move_story_to_merge`, the mergemaster agent should start automatically so I don't need to know how to spawn agents or understand the pipeline topology.

## Acceptance Criteria

- [ ] `move_story_to_merge` MCP tool moves the story file to `work/4_merge/` AND starts the mergemaster agent on that story's worktree (same pattern as `request_qa`)
- [ ] The tool returns JSON with story_id, agent_name, status, worktree_path, and a message (matching `request_qa` response shape)
- [ ] The tool accepts an optional `agent_name` parameter, defaulting to `"mergemaster"`
- [ ] The tool description is updated to reflect that it spawns the mergemaster agent
- [ ] Existing tests are updated to reflect the new async behavior

## Out of Scope

- Changing the `request_qa` tool
- Adding new pipeline stages
- Changing how `start_agent` works internally
