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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.

All of v2.1.247 Home All releases olderv2.1.246 v2.1.248newer
Claude Code v2.1.247

Cached prompt parameters no longer leak between sessions

You'll notice
Useful3 Signal3
Sessions

Cached prompt settings no longer leak from one session into another.

What

The saved last-prompt parameters record now stores the root session id, and the resume path, the reuse path and the freshness check all reject the cache when that id does not match the current session. Previously only the model was compared, so parameters could carry across sessions in the same process.

Details
  • The record also gained a flag marking parameters prompted for the session model.
Evidence

promptForSessionModel

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

See this entry in the whole of v2.1.247 →