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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-host output gets its own attachment types

Under the hood
Useful1 Signal2
Remote Tools

Two attachment types for tool-host output and notices were added to the accepted set.

What

Two attachment types for output from a tool host, one for its result lines and one for a notice about it, were added to the accepted set, along with a matching message subtype check.

Details
  • The notice is pushed during an attachment scan only when its producer hook is present, so whether it appears in practice depends on that producer being wired up.
Evidence

tool_host_result_lines

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 →