Send agent message

Sends one user message to an agent chat, persists transcript entries, and returns the generated assistant reply.

POST/api/v1/experimental/agents/{handle}/chats/{chatId}/messages

Sends one user message to an agent chat, persists transcript entries, and returns the generated assistant reply.

Request Body

application/json

TypeScript Definitions

Use the request body type in TypeScript.

text*string

a non empty string

Length1 <= length

Response Body

`application/json`

curl -X POST "https://loading/api/v1/experimental/agents/{handle}/chats/{chatId}/messages" \  -H "Content-Type: application/json" \  -d '{    "text": "Summarize yesterday\'s support backlog by priority."  }'

{
  "chatId": "chat_01",
  "userMessage": {
    "id": "aefcfb2d-a0f2-4fe9-af6e-9874a7a4d8ee",
    "messageId": "msg_user_01",
    "role": "user",
    "source": "client",
    "message": {
      "parts": [
        {
          "type": "text",
          "text": "Summarize yesterday's support backlog by priority."
        }
      ]
    },
    "createdAt": "2026-03-11T03:00:10.000Z"
  },
  "assistantMessage": {
    "id": "bb7eaab2-3f28-41c0-ae6f-21f38fb4ac96",
    "messageId": "msg_assistant_01",
    "role": "assistant",
    "source": "model",
    "message": {
      "parts": [
        {
          "type": "text",
          "text": "P0: 3 tickets, P1: 11 tickets, P2: 24 tickets..."
        }
      ]
    },
    "createdAt": "2026-03-11T03:00:12.000Z"
  }
}

{
  "issues": [
    {
      "_tag": "Pointer",
      "path": [
        "string"
      ],
      "message": "string"
    }
  ],
  "message": "string",
  "_tag": "HttpApiDecodeError"
}

{
  "code": "authentication_required",
  "message": "Authentication required. Send Authorization: Bearer <api-key>, x-api-key, or a signed-in session."
}

{
  "code": "insufficient_permissions",
  "message": "This API key does not have the required permission.",
  "details": {
    "requiredPermission": "resource.action"
  }
}

{
  "code": "not_found",
  "message": "The requested resource was not found."
}

{
  "code": "internal_error",
  "message": "An unexpected server error occurred."
}

Send agent message

Request Body

Response Body

200application/json

400application/json

401application/json

403application/json

404application/json

500application/json

`application/json`

`application/json`

`application/json`

`application/json`

`application/json`

`application/json`