List thread events
⚠️
Preview — this feature is being built; the design below is the spec.
GET https://app.syntic.ai/v1/sessions/{session_id}/threads/{thread_id}/eventsReturn the event log of a single thread in order. The session-level event list interleaves all threads and tags each event with thread_id; this call filters to one.
For how this fits into a full workflow, see Threads and delegation.
Headers
| Header | Required | Value |
|---|---|---|
Authorization | Yes | Bearer <key>: a private inference key (sk_live_...). See Authentication. |
syntic-beta | Yes, while in preview | agents-2026-11-01. Without it the call fails with 400 beta_required. See Versioning. |
Path parameters
| Parameter | Type | Description |
|---|---|---|
session_id | string | The session id, starting with sesn_. |
thread_id | string | The thread id, starting with thr_. |
Query parameters
| Parameter | Type | Default | Description |
|---|---|---|---|
types | string | Comma-separated event types, for example message.completed,tool_call.started. | |
limit | integer | 50 | 1 to 500. |
after_id | string | Events after this event id. |
Response
200 OK, Content-Type: application/json
{
"data": [
{
"id": "evt_01JCC3F5H7K9M1P3R5T7",
"type": "tool_call.started",
"thread_id": "thr_01JCC2E4G6J8L0N2Q4S6",
"created_at": "2026-11-05T10:02:14Z",
"tool_call_id": "call_12",
"name": "track_shipment",
"arguments": {
"order_id": "88123"
},
"executor": "syntic"
},
{
"id": "evt_01JCC4G6J8L0N2Q4S6U8",
"type": "message.completed",
"thread_id": "thr_01JCC2E4G6J8L0N2Q4S6",
"created_at": "2026-11-05T10:02:40Z",
"message_id": "msg_01JCC4",
"content": "Delivered on 3 November, signed for by the front desk."
}
],
"has_more": false,
"first_id": "evt_01JCC3F5H7K9M1P3R5T7",
"last_id": "evt_01JCC4G6J8L0N2Q4S6U8"
}| Field | Type | Description |
|---|---|---|
data | array | The objects on this page, newest first. |
has_more | boolean | true when another page exists after this one. |
first_id | string or null | Pass as before_id to go back a page. |
last_id | string or null | Pass as after_id to get the next page. |
Examples
curl -sS "https://app.syntic.ai/v1/sessions/sesn_01JC7M2K4P6R8T0V2X4Z/threads/thr_01JCC2E4G6J8L0N2Q4S6/events?types=message.completed,tool_call.started" \
-H "Authorization: Bearer $SYNTIC_API_KEY" \
-H "syntic-beta: agents-2026-11-01"Errors
Errors use the error envelope and carry a request_id. Codes specific to this operation:
| Status | type | code | When |
|---|---|---|---|
| 400 | invalid_request_error | beta_required | The syntic-beta header is missing. |
| 404 | not_found_error | thread_not_found | No thread with this id in the session. |
| 401 | authentication_error | invalid_api_key | The key is missing, unknown, revoked or expired. |
| 429 | rate_limit_error | rate_limited | Too many requests; wait for Retry-After. See Rate-limit headers. |
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