Under the hood
The tool.call hook event gained a 'measure' step that combines context across related events
What
The internal descriptor for the tool.call hook event, used alongside PreToolUse (a hook point that runs before a tool call executes and can block it), now includes a measure function. This function combines the context of one event with the contexts of a list of related events, replacing what was previously a simpler carry function.
Why
This is internal plumbing for how hook event context is assembled; the finding doesn't indicate a directly user-visible change.
Names in the bundletool.call
Documented inapi/managed-agents/events-and-streaming
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What practical difference the new 'measure' combinator makes to hook authors versus the previous 'carry' function is not stated.