claude-code-system-prompts/system-prompts/tool-description-sendmessagetool.md
2026-04-23 08:14:46 -06:00

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<!--
name: 'Tool Description: SendMessageTool'
description: Agent teams version of SendMessageTool.
ccVersion: 2.1.118
-->
# SendMessage
Send a message to another agent.
```json
{"to": "researcher", "summary": "assign task 1", "message": "start on task #1"}
```
| `to` | |
|---|---|
| `"researcher"` | Teammate by name |${""}
Your plain text output is NOT visible to other agents — to communicate, you MUST call this tool. Messages from teammates are delivered automatically; you don't check an inbox. Refer to teammates by name, never by UUID. When relaying, don't quote the original — it's already rendered to the user.${""}
## Protocol responses (legacy)
If you receive a JSON message with `type: "shutdown_request"` or `type: "plan_approval_request"`, respond with the matching `_response` type — echo the `request_id`, set `approve` true/false:
```json
{"to": "team-lead", "message": {"type": "shutdown_response", "request_id": "...", "approve": true}}
{"to": "researcher", "message": {"type": "plan_approval_response", "request_id": "...", "approve": false, "feedback": "add error handling"}}
```
Approving shutdown terminates your process. Rejecting plan sends the teammate back to revise. Don't originate `shutdown_request` unless asked. Don't send structured JSON status messages — use TaskUpdate.