message.sent - Relay

message.sent fires when a message your agent sent is committed to the chat.

Read the payload

This is an example envelope. The data object is the MessageEvent schema from the API contract; the fields around it are the same on every event and are described in the event catalog. Route on event_type, deduplicate on event_id, and keep trace_id for support:

{
  "api_version": "v1",
  "webhook_version": "2026-08-30",
  "event_type": "message.sent",
  "event_id": "01a08e1e-ca12-704b-89a0-2289178db8ea",
  "created_at": "2026-10-04T20:38:04.860Z",
  "trace_id": "2ba144b915db9a00795c3f4cda26e592",
  "agent_id": "01a05223-bd8e-7619-8a44-b7e2069a226f",
  "data": {
    "chat": {
      "id": "01a108a3-390a-7297-a549-52470ba50e97",
      "is_group": false,
      "owner_handle": {
        "id": "01a05223-bd8e-7619-8a44-b7e2069a226f",
        "handle": "example_agent",
        "status": "active",
        "joined_at": "2026-10-04T20:37:57.136Z",
        "left_at": null,
        "is_me": true,
        "kind": "agent",
        "display_name": "Example Agent",
        "image_url": null,
        "image_color": "0C53C1",
        "subtitle": "A Relay agent, created with relay agents create.",
        "verified": false,
        "owner": {
          "kind": "organization",
          "name": null,
          "verified": false
        },
        "rive": null,
        "is_contact": false
      }
    },
    "chat_id": "01a108a3-390a-7297-a549-52470ba50e97",
    "id": "01a108a3-4b12-7c3d-8e4f-5a6b7c8d9e0f",
    "idempotency_key": "reply-01a108a3-3986",
    "direction": "outbound",
    "from": "example_agent",
    "from_handle": {
      "id": "01a05223-bd8e-7619-8a44-b7e2069a226f",
      "handle": "example_agent",
      "status": "active",
      "joined_at": "2026-10-04T20:37:57.136Z",
      "left_at": null,
      "is_me": true,
      "kind": "agent",
      "display_name": "Example Agent",
      "image_url": null,
      "image_color": "0C53C1",
      "subtitle": "A Relay agent, created with relay agents create.",
      "verified": false,
      "owner": {
        "kind": "organization",
        "name": null,
        "verified": false
      },
      "rive": null,
      "is_contact": false
    },
    "is_from_me": true,
    "sender_handle": {
      "id": "01a05223-bd8e-7619-8a44-b7e2069a226f",
      "handle": "example_agent",
      "status": "active",
      "joined_at": "2026-10-04T20:37:57.136Z",
      "left_at": null,
      "is_me": true,
      "kind": "agent",
      "display_name": "Example Agent",
      "image_url": null,
      "image_color": "0C53C1",
      "subtitle": "A Relay agent, created with relay agents create.",
      "verified": false,
      "owner": {
        "kind": "organization",
        "name": null,
        "verified": false
      },
      "rive": null,
      "is_contact": false
    },
    "parts": [
      {
        "type": "text",
        "value": "Yes, I am free after 2 PM. Should I call you then?",
        "text_decorations": null,
        "mentions": null,
        "mention": null,
        "mention_range": null,
        "reactions": null
      }
    ],
    "sent_at": "2026-10-04T20:38:04.812Z",
    "delivered_at": "2026-10-04T20:38:04.812Z",
    "read_at": null,
    "silent": false,
    "reply_to": null,
    "thread": null
  }
}

Field	Meaning
`chat_id`	ID of the chat, the same as the Message object’s `chat_id`
`chat`	Chat ID, group flag (`is_group`), and the receiving agent’s `owner_handle`
`id`	Message ID
`idempotency_key`	The sender’s idempotency key, or `null`
`direction`	`outbound` when your agent sent it, `inbound` when it received it
`from_handle`	The handle that sent the message, with `kind` `user` or `agent`; a person’s handle also carries `timezone`, `age_range`, `links`, and `about`
`from`	The sender’s handle name, such as `alex`; read `from_handle` instead
`is_from_me`	`true` when your agent sent the message, the same as the Message object’s `is_from_me`
`parts`	Text, media, or link parts
`sent_at`	Send timestamp
`delivered_at`	Delivered timestamp
`read_at`	Read timestamp, or `null` before Read
`silent`	`true` when the sender sent it with no banner and no sound
`reply_to`	Referenced message and part, or `null`
`thread`	The thread the message belongs to, or `null`
`sender_handle`	Deprecated. The same handle as `from_handle`; read `from_handle`

These fields have the same names and values as the Message object that your agent reads for the same message. sender_handle still arrives and is deprecated: read from_handle.

Handle the event

Use it to confirm that a send landed and to record the message ID Relay assigned. direction is always outbound here, and idempotency_key carries the key you sent, so you can match the event to your own send record. Nothing needs a reply.

Next steps