Under the hood
Useful1 Signal1
SDK message and control-protocol schemas were restructured with no change to fields or defaults.
What's wrong with this entry?
Anonymous. No account, no email.
What
The message, hook payload and control protocol schemas are now built from directly bound helpers rather than one shared namespace object. Field names, defaults, optionality and descriptions are unchanged.
Evidence
Controls Claude's thinking/reasoning behavior. When set, takes precedence over the deprecated maxThinkingTokens.
Strings lifted out of the shipped bundle, so the claim above can be checked against them.