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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.

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Claude Code v2.1.242

Tool calls with a late host argument are rejected instead of run

You'll notice
Useful3 Signal3
Tool Execution

Local tool calls that get a host argument too late now fail instead of running.

What

Both the streaming and the direct tool-execution paths now check, before running a locally-executed tool, whether it was handed a host argument that arrived too late, and fail the call with a dedicated error rather than executing it.

Evidence

late host argument on a local tool call

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 v2.1.242 →