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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 v2.1.224

Shell commands run from a skill preamble get distinct IDs

You'll notice
Useful3 Signal2
Skills

Commands run from a skill preamble get their own IDs, so results no longer collide.

What

Each command validated from a skill's preamble now gets its own tool-use ID rather than sharing the caller's, so results and permissions no longer collide between them.

Details
  • IDs take the form parent id + :preamble- + index; the Bash tool finds that marker in the id and recovers the parent id from the text before it.
  • The separate :inner suffix keeps its existing meaning.
Evidence

:preamble-

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

See this entry in the whole of v2.1.224 →