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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 v2.1.229

Skill preloads are recorded as invocations

Under the hood
Useful1 Signal2
Skills

Skills loaded ahead of time for an agent are now logged like real skill uses.

What

Preloading a skill for an agent now emits the same skill invocation event as a real use, tagged with execution context "preload" and trigger "agent-preload", plus the parent agent id and the length of the skill content.

Evidence

agent-preload

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

See this entry in the whole of v2.1.229 →