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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.300 ·

Sessions keep a record of tool descriptions the API refused

Each session now has a place to remember tool schemas that the API refused

Under the hood Internal Changes
JSON All of v2.1.300
Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
MCPArea: what it touches
Internal ChangesKind: in v2.1.300,
Internal ChangesSection of the release
What

A tool schema is the description of a tool and its inputs that Claude Code sends to the model. Each session's request state now includes a record of tool schemas the API refused.

Why

This points to new handling for cases where the API rejects a tool's description.

See this entry in the whole of v2.1.300 →

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