Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
0Signal: worth watching, 1 to 5
DependenciesArea: what it touches
Internal ChangesKind: in v2.1.300,
Internal ChangesSection of the release
What
The library Claude Code uses to check that data has the right shape now locks a shared list so it cannot be changed, and builds the details of a failed check only when they are asked for.
Why
This is internal housekeeping, and nothing in it is meant to change what you see.