Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
ToolsArea: what it touches
Internal ChangesKind: in v2.1.287,
Internal ChangesSection of the release
What
A schema is a description of what shape some data should have, such as which fields a tool's input takes. Claude Code tidies schemas up before using them. When an object in a schema does not say whether extra, unlisted fields are allowed, Claude Code now adds additionalProperties set to true, which explicitly allows them.
Why
Tool descriptions sent to the model may now say plainly that extra fields are allowed, instead of leaving it unstated.
How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtWhich tools' schemas go through this step is not known.
