Follow Discord
Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.251 ·

Schema stripping now reaches inside array fields

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

You'll notice Internal Changes
JSON All of v2.1.251
You'll noticeTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
ToolsArea: what it touches
Internal ChangesKind: in v2.1.251,
Internal ChangesSection of the release
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.

See this entry in the whole of v2.1.251 →

Feedback