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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.242

SDK sessions can set max thinking tokens and thinking display at startup

You'll notice
Useful3 Signal2
Agents

SDK sessions can set a thinking token limit and thinking display when they start.

What

When a session starts, the control channel now sends a set_max_thinking_tokens request carrying a maximum thinking token count, a thinking display setting, or both, if the caller supplied them.

Details
  • Sent only when thinking.maxThinkingTokens or thinking.display is provided; otherwise nothing extra goes out.
  • Sits next to the existing set-mode request, which switched from generating a random UUID to a shared id helper.
Evidence

subtype: "set_max_thinking_tokens"

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.242 →