Source Intelligence
Follow Discord

DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

← All of v2.1.251 Home All releases ←olderv2.1.250
Claude Code v2.1.251

Schema stripping now reaches inside array fields

You'll notice
Useful2 Signal2
Tools

Schema cleanup now reaches inside array fields, which is the shape skill tools use.

What

When structured output is unavailable or not consented to, the marker field removed from tool input schemas is now also stripped from the item schema of array-typed fields, which is the shape skill tool definitions use.

Evidence

function C3n(e, t, r)

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.251 →