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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 v2.1.238

Skill results say when the skill was only read

Use it now
Useful2 Signal3
Skills not in their notes

Skill results now flag when a skill was only read rather than actually run.

readOnly
What

Results from the skill tool now carry an optional readOnly flag, set when a skill's instructions were loaded without anything being run. Anyone consuming skill results through the SDK or the streaming output can now tell a read-only load apart from a real execution.

Details
  • New optional boolean on the skill tool's result schema, documented as true when the instructions were loaded and nothing ran.
  • Not gated; it appears whenever the load was read-only.
Evidence

True when the skill instructions were loaded read-only (nothing was executed)

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 v2.1.238 →