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 v2.1.248 Home All releases olderv2.1.247 v2.1.250newer
Claude Code v2.1.248

Published artifacts can now load a fixed list of CDNs

You'll notice
Useful4 Signal4
Artifacts

Published artifacts may now load scripts and fonts from a fixed short list of CDNs.

What

Artifacts you publish are no longer required to be fully self-contained. Scripts may load from cdnjs.cloudflare.com (preferred), cdn.jsdelivr.net/npm/, cdn.tailwindcss.com and code.jquery.com; stylesheets only from fonts.googleapis.com and fonts.gstatic.com. Everything else, including unpkg, esm.sh and any non-script request even to an allowed CDN, is blocked silently by the content security policy. Available to anyone using artifact publishing on this build.

Details
  • Guidance now asks for pinned UMD builds placed before inline scripts.
  • Mermaid diagrams stay native: "no library needed, don't load one".
  • Previously the same text said self-contained only, with Google Fonts as the sole exception.
Evidence

External resources — CDN allowlist (CSP-enforced)

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 →