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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 v2.1.225

Tool description cache key gained a segment

Under the hood
Useful2 Signal0
Elsewhere

Tool descriptions are cached separately depending on which tools are loaded, avoiding stale reuse.

What

Prepared tool descriptions are cached under a key that now varies on whether a particular tool is in the tool set.

Details
  • an "S:" prefix segment is added when that tool is present, empty otherwise
  • sessions with and without it no longer share cached descriptions
Evidence

? "S:" : ""

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

See this entry in the whole of v2.1.225 →