Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
API ClientArea: what it touches
Internal ChangesKind: in v2.1.228,
Internal ChangesSection of the release
What
Messages Claude Code synthesizes itself, such as tool-use notices, stop-sequence messages and virtual transcript entries, now set diagnostics: null and a null token-details field in usage, matching the upgraded SDK message type.
Evidence
diagnostics: null
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
