Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
0Signal: worth watching, 1 to 5
ElsewhereArea: what it touches
Internal ChangesKind: in v2.1.265,
Internal ChangesSection of the release
What
When Claude Code detects a mismatch between tool-use and tool-result messages (a structural check called ensureToolResultPairing), the debug and error messages it logs are now built differently: each message is numbered with an index, and tool-use IDs are formatted through a redaction/formatting helper and joined with a dedicated helper function, instead of being concatenated directly into a plain string.
Why
This makes these internal diagnostic logs more structured and consistent, and applies proper redaction formatting to identifiers that appear in them.
