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Notify subscribers when thread read state changes - #52384
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## 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
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Notify subscribers when thread read state changes
What changed
Add the experimental
thread/readState/changednotification withthreadIdand the committedreadStatereceipt. 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 beforeturn/completedso 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/readafter terminal activity.