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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 v2.1.246

Skill bodies load on demand instead of shipping in the main bundle

You'll notice
Useful3 Signal2
Skills

Skill instructions load only when you use a skill, so startup and listing cost nothing.

What

Skill instructions are no longer held in memory at startup. Listing skills now costs nothing, and the full text is fetched only when you actually invoke one.

Details
  • Only the short skill description and its menu entry stay in the main bundle; the body and any bundled files are pulled from a separate chunk on first use.
  • The PR-review command, for example, loads its instruction text and its file set through a dynamic import rather than holding them in scope.
  • There are 1060 of these on-demand chunk loads in this build; the previous build had none.
  • Unconditional, with no setting to opt out.
Evidence

files: () => Ur().then((e) => e.SKILL_FILES),

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

See this entry in the whole of v2.1.246 →