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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 v2.1.248

Skill results describe read-only loading and background sub-agents

Under the hood
Useful2 Signal3
Skills

Skill results now say when instructions were only loaded, or when a background sub-agent was launched.

What

The Skill tool's result schema now spells out two shapes: an inline result that can carry readOnly, meaning the skill instructions were loaded without executing anything, and a forked result carrying an agent id plus background, meaning a sub-agent was launched and its real outcome arrives later as a task notification.

Details
  • The input schema tells the model to use a name from the available-skills list and not to guess.
Evidence

The name of a skill from the available-skills list. Do not guess names.

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 v2.1.248 →