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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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event-deltas changedmanaged-agents/event-deltas

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3232When a previewed event starts, the stream emits an `event_start` carrying the upcoming event's type and `id`:
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34```json
34```text wrap
3535{
3636 "type": "event_start",
3737 "event": {
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4444For `agent.message`, the start is followed by `event_delta` events carrying incremental text. Each delta names the event it extends in `event_id` and the content block it extends in `delta.index`:
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46```json
46```text wrap
4747{
4848 "type": "event_delta",
4949 "event_id": "sevt_01abc...",
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6868 
6969## Accumulate and reconcile
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71Every SDK that supports event deltas includes an [accumulator helper](https://platform.claude.com/docs/en/managed-agents/event-deltas#sdk-accumulator-helpers) that handles the `index` bookkeeping for you. The manual pattern in this section works in every language when you need custom bookkeeping. Apply it to the generated event types.
71Every SDK that supports event deltas includes an [accumulator helper](https://platform.claude.com/docs/en/managed-agents/event-deltas#sdk-accumulator-helpers) that handles the `index` (csharp, go: `Index`) bookkeeping for you. The manual pattern in this section works in every language when you need custom bookkeeping. Apply it to the generated event types.
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7373In the manual pattern, hold preview text in a temporary map keyed by `(event_id, index)`, and treat the buffered event as the record. Reconcile the two for each model request.
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