Source Intelligence

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.

All of v2.1.246 Home All releases olderv2.1.245 v2.1.247newer
Claude Code v2.1.246

Bundled skill and reference text moved out of the JavaScript into embedded files

Under the hood
Useful1 Signal1
Skills

Built-in skills and their reference docs now load from embedded files rather than inline strings.

What

The built-in skills and their reference documents ship the same content, but it is now read from files embedded in the binary instead of sitting in the JavaScript as giant strings.

Details
  • Affected: the design-sync, design-canvas, doc, whiteboard, prototype, data-visualization, plan-artifact, run-skill-generator, artifact-components, artifact-design, artifact-dashboard, artifact-diagramming, artifact-data-table and artifact-pr-review skills, their page and template HTML, their helper scripts, and the bundled API reference set for C#, Go, Java, PHP, Python, Ruby and TypeScript.
  • Paths of the form /$bunfs/root/<name>.md or .txt appear 164 times in this build and not at all in the previous one; references to that root total 1481.
  • Skill registrations, the lazy chunk loaders and the per-skill file listings are unchanged, so no skill was removed and nothing loads differently from the model's point of view.
  • A small normalizer was added to accept either a raw string or a module namespace from an embedded asset.
  • Practical effects: startup no longer parses tens of thousands of lines of prose as JavaScript source, and the prompt text is no longer greppable in the JavaScript bundle.
  • Unconditional, with no flag or environment variable involved.
Evidence

/$bunfs/root/sync-hashes.mjs-5rymp3zc.txt, /$bunfs/root/SKILL-8bdpvcbd.md, "templates/workshop-page.html": a,, references/plugin-eval-quickref.md, /$bunfs/root/color-formula-dc6qvg1m.md, /$bunfs/root/SKILL_COMPOSED-amaxbqpa.md, /$bunfs/root/cli-40vh1c3p.md, /$bunfs/root/SKILL-nrz66j7x.md, /$bunfs/root/platform-availability-nrkk9kb2.md, /$bunfs/root/token-counting-znjwtf00.md, /$bunfs/root/files-api-bmqt0y4f.md, /$bunfs/root/plugin-eval-quickref-2xg66zcm.md

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 →