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Protocol Methods

Complete method reference for ARC Protocol.

Task Methods​

task.create​

Create a new asynchronous task.

Request:

{
  "method": "task.create",
  "params": {
    "requestAgent": "client-123",
    "targetAgent": "document-analyzer",
    "traceId": "trace-abc",
    "initialMessage": {
      "role": "user",
      "parts": [{"type": "text", "content": "Analyze report"}]
    }
  }
}

Response:

{
  "result": {
    "type": "task",
    "task": {
      "taskId": "task-xyz",
      "status": "PENDING",
      "message": {
        "role": "agent",
        "parts": [{"type": "text", "content": "Task created"}]
      }
    }
  }
}

task.send​

Send additional message to existing task.

task.info​

Get task status and message history.

task.cancel​

Cancel a running task.

task.subscribe​

Subscribe to task notifications via WebSocket.

task.notification​

Server-initiated notification for subscribed clients.

Chat Methods​

chat.start​

Begin a real-time conversation.

Request:

{
  "method": "chat.start",
  "params": {
    "requestAgent": "client-123",
    "targetAgent": "support-agent",
    "traceId": "trace-abc",
    "initialMessage": {
      "role": "user",
      "parts": [{"type": "text", "content": "Need help"}]
    }
  }
}

Response (SSE Stream):

data: {"type":"chat","chat":{"chatId":"chat-xyz","status":"ACTIVE","message":{"role":"agent","parts":[{"type":"text","content":"How can I help?"}]}}}

chat.message​

Send follow-up message in active chat.

chat.end​

Terminate an active chat session.

Full Specification​

See the complete specification: ARC Specification Document