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Brent Traut
82883da25e
## What changed Add the experimental `thread/readState/changed` notification with `threadId` and the committed `readState` receipt. Send it to existing thread subscribers when terminal activity updates read state or a revert clears a removed unread position. Emit terminal read-state updates before `turn/completed` so completion remains the last notification for that result. Expose the notification in generated JSON schemas, TypeScript types, and Python SDK models. Document experimental capability gating, subscription lifetime, notification opt-out, and refreshing receipts when concurrent responses disagree. ## Testing Extend the read-state integration test to assert that the notification receipt matches the receipt returned by `thread/read` after terminal activity. GitOrigin-RevId: 28935352a881b7a5e2e7f629173c3b2061bd7941