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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

Cloud sessions accept only seven live settings changes

You'll notice
Useful2 Signal2
Cloud Sessions

Only seven settings can be changed mid-run against a cloud session; others are rejected by name.

What

Changing settings mid-run against a cloud-hosted session is limited to model, advisorModel, effortLevel, ultracode, fastMode, viewMode and alwaysThinkingEnabled. Any other key is rejected by name.

Details
  • The rejection lists the offending keys, truncating long names and capping the list with "(and N more)".
  • A settings payload that is not an object is rejected outright.
Evidence

apply_flag_settings requires settings to be an object

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

See this entry in the whole of v2.1.242 →