Swarm Operations

API reference for multi-agent orchestration tools in Claude Code v2.1.45.

---

Tools Overview

flowchart TD
    Start([What do you need to do?]) --> Q1{Operation type?}
    Q1 -->|Create a team| TC[TeamCreate]
    Q1 -->|Send a message| SM[SendMessage]
    Q1 -->|Clean up team| TD[TeamDelete]
    Q1 -->|Spawn an agent| Task[Agent tool]
    Q1 -->|Manage work items| TT[TaskCreate / TaskUpdate / TaskList / TaskGet]

---

TeamCreate -- Create a Team

TeamCreate({
  team_name: "feature-auth",
  description: "Implementing OAuth2 authentication"
})

Creates:

• ~/.claude/teams/feature-auth/config.json
• ~/.claude/tasks/feature-auth/ directory
• You become the team leader

---

SendMessage -- All Inter-Agent Communication

SendMessage handles direct messages, broadcasts, shutdown, and plan approval.

Direct Message (type "message")

SendMessage({
  type: "message",
  recipient: "security-reviewer",
  content: "Please prioritize the authentication module. The deadline is tomorrow.",
  summary: "Prioritize auth module"
})

Required fields: type, recipient, content, summary

IMPORTANT: Your text output is NOT visible to teammates. You MUST use SendMessage to communicate.

Broadcast (type "broadcast")

SendMessage({
  type: "broadcast",
  content: "Status check: Please report your progress",
  summary: "Requesting status from all"
})

Required fields: type, content, summary

WARNING: Broadcasting is expensive -- sends N separate messages for N teammates. Prefer direct message to specific teammates.

When to broadcast:

• Critical issues requiring immediate team-wide attention
• Major announcements affecting everyone

When NOT to broadcast:

• Responding to one teammate
• Normal back-and-forth
• Information relevant to only some teammates

Shutdown Request (type "shutdown_request")

Leader requests teammate to exit:

SendMessage({
  type: "shutdown_request",
  recipient: "security-reviewer",
  content: "All tasks complete, wrapping up"
})

Shutdown Response (type "shutdown_response")

Teammate approves or rejects shutdown:

// Approve (terminates your process)
SendMessage({
  type: "shutdown_response",
  request_id: "shutdown-123",
  approve: true
})

// Reject (continue working)
SendMessage({
  type: "shutdown_response",
  request_id: "shutdown-123",
  approve: false,
  content: "Still working on task #3, need 5 more minutes"
})

IMPORTANT: Extract the requestId from the JSON shutdown_request message and pass it as request_id. Simply saying "I'll shut down" is not enough -- you must call the tool.

Plan Approval (type "plan_approval_response")

Leader approves or rejects teammate's plan:

// Approve
SendMessage({
  type: "plan_approval_response",
  request_id: "plan-456",
  recipient: "architect",
  approve: true
})

// Reject with feedback
SendMessage({
  type: "plan_approval_response",
  request_id: "plan-456",
  recipient: "architect",
  approve: false,
  content: "Please add error handling for the API calls and consider rate limiting"
})

---

TeamDelete -- Remove Team Resources

TeamDelete()

Removes:

• ~/.claude/teams/{team-name}/ directory
• ~/.claude/tasks/{team-name}/ directory

IMPORTANT: Will fail if teammates are still active. Use shutdown_request first.

---

Task Tool -- Spawn Teammates

Agent({
  team_name: "my-project",        // Required -- which team to join
  name: "worker-1",               // Required -- teammate's name
  subagent_type: "general-purpose",
  prompt: "Your instructions here...",
  run_in_background: true         // Teammates usually run in background
})

For spawning without team membership (subagents), see Skill(skill: "swarm-spawning").

---

Message Formats

Messages are JSON objects stored in inbox files.

Regular Message

{
  "from": "team-lead",
  "text": "Please prioritize the auth module",
  "timestamp": "2026-01-25T23:38:32.588Z",
  "read": false
}

Shutdown Request

{
  "type": "shutdown_request",
  "requestId": "shutdown-abc123@worker-1",
  "from": "team-lead",
  "reason": "All tasks complete",
  "timestamp": "2026-01-25T23:38:32.588Z"
}

Shutdown Approved

{
  "type": "shutdown_approved",
  "requestId": "shutdown-abc123@worker-1",
  "from": "worker-1",
  "paneId": "%5",
  "backendType": "in-process",
  "timestamp": "2026-01-25T23:39:00.000Z"
}

Idle Notification (auto-sent when teammate stops)

{
  "type": "idle_notification",
  "from": "worker-1",
  "timestamp": "2026-01-25T23:40:00.000Z",
  "completedTaskId": "2",
  "completedStatus": "completed"
}

Task Completed

{
  "type": "task_completed",
  "from": "worker-1",
  "taskId": "2",
  "taskSubject": "Review authentication module",
  "timestamp": "2026-01-25T23:40:00.000Z"
}

Plan Approval Request

{
  "type": "plan_approval_request",
  "from": "architect",
  "requestId": "plan-xyz789",
  "planContent": "# Implementation Plan\n\n1. ...",
  "timestamp": "2026-01-25T23:41:00.000Z"
}

Permission Request (for sandbox/tool permissions)

{
  "type": "permission_request",
  "requestId": "perm-123",
  "workerId": "worker-1@my-project",
  "workerName": "worker-1",
  "workerColor": "#4A90D9",
  "toolName": "Bash",
  "toolUseId": "toolu_abc123",
  "description": "Run npm install",
  "input": {"command": "npm install"},
  "permissionSuggestions": ["Bash(npm *)"],
  "createdAt": 1706000000000
}

---

Error Handling

Common Errors

• "Cannot cleanup with active members" -- Teammates still running. Send shutdown_request to all teammates first, wait for approval.
• "Already leading a team" -- Team already exists. Call TeamDelete first, or use different team name.
• "Agent not found" -- Wrong teammate name. Read config.json for actual names.
• "Team does not exist" -- No team created. Call TeamCreate first.
• "team_name is required" -- Missing team context. Provide team_name parameter.
• "Agent type not found" -- Invalid subagent_type. Check available agents with proper prefix.

Graceful Shutdown Sequence

Always follow this sequence:

flowchart TD
    A[1. Send shutdown_request to all teammates] --> B[2. Wait for shutdown_response approve]
    B --> C[3. Verify no active members in config.json]
    C --> D[4. Call TeamDelete]

// 1. Request shutdown for all teammates
SendMessage({ type: "shutdown_request", recipient: "worker-1", content: "All tasks complete" })
SendMessage({ type: "shutdown_request", recipient: "worker-2", content: "All tasks complete" })

// 2. Wait for shutdown approvals
// Messages arrive automatically in your inbox

// 3. Verify no active members
// Read ~/.claude/teams/{team}/config.json

// 4. Only then cleanup
TeamDelete()

Handling Crashed Teammates

Teammates have a 5-minute heartbeat timeout. If a teammate crashes:

1. They are automatically marked as inactive after timeout
2. Their tasks remain in the task list
3. Another teammate can claim their tasks
4. TeamDelete will work after timeout expires

Debugging

Read team config to see members:

# Check team config -- view members and backend types
# Read ~/.claude/teams/{team}/config.json

# Check teammate inboxes
# Read ~/.claude/teams/{team}/inboxes/{agent}.json

# List all teams
# ls ~/.claude/teams/

# Check task states
# Read ~/.claude/tasks/{team}/*.json

---

Related Skills

• Core concepts -- Skill(skill: "swarm-primitives")
• Spawning agents -- Skill(skill: "swarm-spawning")
• Patterns and recipes -- Skill(skill: "swarm-patterns")

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SOURCE: Claude Code v2.1.45 tool descriptions (TeamCreate, SendMessage, TeamDelete) -- verified from system prompt 2026-02-18