Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
0Signal: worth watching, 1 to 5
MCPArea: what it touches
Internal ChangesKind: in v2.1.221,
Internal ChangesSection of the release
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.
