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.
Cached prompt parameters no longer leak between sessions
You'll notice
Useful3Signal3
Sessions
Cached prompt settings no longer leak from one session into another.
What's wrong with this entry?
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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.