agenthub

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• SKILL.md

SKILL.md (first lines)

# AgentHub — Multi-Agent Collaboration

Spawn N parallel AI agents that compete on the same task. Each agent works in an isolated git worktree. The coordinator evaluates results and merges the winner.

## Slash Commands

| Command | Description |
|---------|-------------|
| `/hub:init` | Create a new collaboration session — task, agent count, eval criteria |
| `/hub:spawn` | Launch N parallel subagents in isolated worktrees |
| `/hub:status` | Show DAG state, agent progress, branch status |
| `/hub:eval` | Rank agent results by metric or LLM judge |
| `/hub:merge` | Merge winning branch, archive losers |
| `/hub:board` | Read/write the agent message board |
| `/hub:run` | One-shot lifecycle: init → baseline → spawn → eval → merge |

## Agent Templates

When spawning with `--template`, agents follow a predefined iteration pattern:

| Template | Pattern | Use Case |
|----------|---------|----------|
| `optimizer` | Edit → eval → keep/discard → repeat x10 | Performance, latency, size |
| `refactorer` | Restructure → test → iterate until green | Code quality, tech debt |
| `test-writer` | Write tests → measure coverage → repeat | Test coverage gaps |
| `bug-fixer` | Reproduce → diagnose → fix → verify | Bug fix approaches |

Templates are defined in `references/agent-templates.md`.

## When This Skill Activates

Trigger phrases:
- "try multiple approaches"
- "have agents compete"
- "parallel optimization"
- "spawn N agents"
- "compare different solutions"
- "fan-out" or "tournament"
- "generate content variations"
- "compare different drafts"
- "A/B test copy"
- "explore multiple strategies"

## Coordinator Protocol

The main Claude Code session is the coordinator. It follows this lifecycle:

```
INIT → DISPATCH → MONITOR → EVALUATE → MERGE
```

### 1. Init

Run `/hub:init` to create a session. This generates:
- `.agenthub/sessions/{session-id}/config.yaml` — task config
- `.agenthub/sessions/{session-id}/state.json` — state machine
- `.agenthub/board/` — message board channels

### 2. Dispatch

Run `/hub:spawn` to launch agents. For each agent 1..N:
- Post task assignment to `.agenthub/board/dispatch/`
- Spawn via Agent tool with `isolation: "worktree"`
- All agents launched in a single message (parallel)

### 3. Monitor

Run `/hub:status` to check progress:
- `dag_analyzer.py --status --session {id}` shows branch state
- Board `progress/` channel has agent updates

### 4. Evaluate

Run `/hub:eval` to rank results:
- **Metric mode**: run eval command in each worktree, parse numeric result
- **Judge mode**: read diffs, coordinator ranks by quality
- **Hybrid**: metric first, LLM-judge for ties

### 5. Merge

Run `/hub:merge` to finalize:
- `git merge --no-ff` winner into base branch
- Tag losers: `git tag hub/archive/{session}/agent-{i}`
- Clean up worktrees
- Post merge summary to board

## Agent Protocol

Each subagent receives this prompt pattern:

```
You are agent-{i} in hub session {session-id}.
Your task: {task description}

Instructions:
1. Read your assignment at .agenthub/board/dispatch/{seq}-agent-{i}.md
2. Work in your worktree — make changes, run tests, iterate
3. Commit all changes with descriptive messages
4. Write your result summary to .agenthub/board/results/agent-{i}-result.md
5. Exit when done
```

Agents do NOT see each other's work. They do NOT communicate with each other. They only write to the board for the coordinator to read.

## DAG Model

### Branch Naming

```
hub/{session-id}/agent-{N}/attempt-{M}
```

- Session ID: timestamp-based (`YYYYMMDD-HHMMSS`)
- Agent N: sequential (1 to agent-count)
- Attempt M: increments on retry (usually 1)

### Frontier Detection

Frontier = branch tips with no child branches. Equivalent to AgentHub's "leaves" query.

From brovzar-lab/carpetify, MIT.

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