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}/events

Return 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

HeaderRequiredValue
AuthorizationYesBearer <key>: a private inference key (sk_live_...). See Authentication.
syntic-betaYes, while in previewagents-2026-11-01. Without it the call fails with 400 beta_required. See Versioning.

Path parameters

ParameterTypeDescription
session_idstringThe session id, starting with sesn_.
thread_idstringThe thread id, starting with thr_.

Query parameters

ParameterTypeDefaultDescription
typesstringComma-separated event types, for example message.completed,tool_call.started.
limitinteger501 to 500.
after_idstringEvents 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"
}
FieldTypeDescription
dataarrayThe objects on this page, newest first.
has_morebooleantrue when another page exists after this one.
first_idstring or nullPass as before_id to go back a page.
last_idstring or nullPass 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:

StatustypecodeWhen
400invalid_request_errorbeta_requiredThe syntic-beta header is missing.
404not_found_errorthread_not_foundNo thread with this id in the session.
401authentication_errorinvalid_api_keyThe key is missing, unknown, revoked or expired.
429rate_limit_errorrate_limitedToo many requests; wait for Retry-After. See Rate-limit headers.
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