> ## Documentation Index
> Fetch the complete documentation index at: https://opensandbox-oc-s-762ac928075c46d2828bcb22.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Send Message

Send a message to an agent instance. Returns a server-sent event stream with the agent's response.

If the instance is still `creating`, waits up to 30s for it to become ready.

<ParamField path="agentId" type="string" required>
  Agent ID
</ParamField>

<ParamField path="id" type="string" required>
  Instance ID
</ParamField>

<ParamField body="content" type="string" required>
  Message content
</ParamField>

<ParamField body="conversation_id" type="string">
  Conversation identifier for multiplexing. The caller owns this identity (e.g. Slack thread timestamp).
</ParamField>

<ResponseExample>
  ```text 200 theme={null}
  Content-Type: text/event-stream

  data: {"type":"text","content":"Cloning the repo now...","conversation_id":"1712345678.123456"}
  data: {"type":"text","content":"Found 3 issues...","conversation_id":"1712345678.123456"}
  data: {"type":"done"}
  ```
</ResponseExample>