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

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_.

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": {}
}
FieldTypeDescription
idstringStarts with sesn_.
agent_idstringThe agent the session runs.
agent_versionintegerThe version it is pinned to for its whole life.
statusstringrunning, requires_action (waiting for your tool result or approval), idle or archived.
channelstringapi for sessions started here; channel sessions show telegram, slack and so on.
usageobjectRunning token and cost totals.
outcomeobject or nullSet when a turn ends: reason is end_turn, max_turns, budget_exhausted, interrupted or error.
last_event_atstringTime 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:

StatustypecodeWhen
400invalid_request_errorbeta_requiredThe syntic-beta header is missing.
404not_found_errorsession_not_foundNo session with that id in this workspace.
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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