What
When calling set_max_thinking_tokens with max_thinking_tokens omitted or null, thinking now resets to the session default rather than keeping the previously-set mid-session override. This makes it possible to undo a thinking budget adjustment without restarting the session.
Details
- Previously,
max_thinking_tokens: nullhad ambiguous behavior - Now: omitting or setting to null clears any mid-session budget override back to the spawn-time budget
- For sessions where thinking is disabled, this keeps thinking disabled
max_thinking_tokensmust be an integer (or null); non-integer numbers are now rejected
Evidence
Updated set_max_thinking_tokens description (search for "When max_thinking_tokens is omitted or null, thinking resets to the session default")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.