Get a session
⚠️
Preview — this feature is being built; the design below is the spec.
GET https://app.syntic.ai/v1/sessions/{session_id}Return a session’s status, usage totals and the outcome of its latest turn. Poll it if you are not holding a stream open.
For how this fits into a full workflow, see Sessions.
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_. |
Response
200 OK, Content-Type: application/json
{
"id": "sesn_01JC7M2K4P6R8T0V2X4Z",
"type": "session",
"agent_id": "agt_01JC4R8W6Q2N9X3T5V7Y",
"agent_version": 4,
"status": "idle",
"channel": "api",
"title": "Refund for order 88123",
"usage": {
"input_tokens": 9120,
"cached_input_tokens": 6400,
"output_tokens": 412,
"cost_usd": "0.0294"
},
"outcome": {
"reason": "end_turn",
"message": null
},
"created_at": "2026-11-05T10:00:00Z",
"last_event_at": "2026-11-05T10:00:00Z",
"metadata": {}
}| Field | Type | Description |
|---|---|---|
id | string | Starts with sesn_. |
agent_id | string | The agent the session runs. |
agent_version | integer | The version it is pinned to for its whole life. |
status | string | running, requires_action (waiting for your tool result or approval), idle or archived. |
channel | string | api for sessions started here; channel sessions show telegram, slack and so on. |
usage | object | Running token and cost totals. |
outcome | object or null | Set when a turn ends: reason is end_turn, max_turns, budget_exhausted, interrupted or error. |
last_event_at | string | Time of the latest event. |
Examples
curl -sS https://app.syntic.ai/v1/sessions/sesn_01JC7M2K4P6R8T0V2X4Z \
-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 | session_not_found | No session with that id in this workspace. |
| 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. |
Related
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