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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 v2.1.239

Effort level is stored as a structured value

Under the hood
Useful1 Signal2
Effort

Effort settings are wrapped in a structured value everywhere, including the model menu and SDK.

/model
What

The session's effort setting is no longer compared as a bare string; it is wrapped and unwrapped through helpers everywhere it is set or checked, including the /model menu, the effort slash command, SDK effort messages and the effort permission layer. No change in behaviour.

Evidence

sessionEffort

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 v2.1.239 →