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Events

Every event a turn streams, and the stored event log.

Turns stream server-sent events. Most are also stored in the session's event log (GET /v1/sessions/:id/events), which is what traces, replay and resume read.

EventWhenData
turn.startedA turn starts{ turn_number, model, input_text, ... }
turn.resumedA paused turn continues after /approve{ action_id, resolution, tool_results, resumed_from_turn }
output_text.deltaText as it's written{ delta }
tool_call.deltaA widget being written (live only){ action_id, tool, delta }
tool_call.startedThe model called a tool{ tool, arguments, action_id }
tool_call.completedA tool Cencori ran finished{ tool, output, action_id }
turn.pausedWaiting for your tool results or an approval{ reason, action_id, actions, usage, trace }
turn.completedThe reply is done{ turn_number, output, usage, trace }
turn.failedThe turn failed{ turn_number, output: { error }, usage, trace }

Trace data

turn.paused, turn.completed and turn.failed carry a trace:

{
  "request_id": "req_...",
  "provider": "cerebras",
  "model": "gpt-oss-120b",
  "used_fallback": false,
  "cost_usd": 0.00042,
  "ttft_ms": 310,
  "model_ms": 1240,
  "rounds": 2
}

rounds counts model calls in the turn (each tool round Cencori runs itself adds one). request_id links to the call in Request logs.

Reading a stream

Events are standard SSE: an event: line, a data: line of JSON, a blank line. Ignore events you don't know: new ones are added over time.

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