What
The component that catches crashes in the UI previously just recorded that an error happened and rendered nothing. It now reports the error and calls an optional onError handler, so a failed render surfaces rather than disappearing.
Evidence
componentDidCatch
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
Names in the bundleonError
The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.
Confirmed since
Anthropic's documentation has since written up onError, on List Events.
- `BetaManagedAgentsSessionErrorEvent object`api/beta/sessions/events/list see the edit
One source agreesOne thing we can check says the same as this entry.
Anthropic's documentation agrees
Anthropic's documentation has since written up onError, on List Events.