Source Intelligence
Follow Discord

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 v2.1.221 Home All releases ←olderv2.1.220 v2.1.222newer→
Claude Code v2.1.221

MCP tool construction extracted and reused for cached servers

Under the hood
Useful2 Signal0
MCP

MCP tools now get built the same way whether they come fresh from a server or from cache.

What

Turning a tools/list response into Claude Code tool objects is now one shared function, which also serves servers rebuilt from a persisted cache.

Details
  • The extracted function covers schema normalization, skipping API-incompatible schemas, degraded-mode telemetry, permission wrappers and auto-background.
  • It takes a source mode; the live listing path passes "live".
  • A second caller builds the same tools from a cache entry carrying a saved-at timestamp.
  • The zero-tools degraded event is now emitted only on the live path.
Evidence

cacheSavedAt

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

See this entry in the whole of v2.1.221 →