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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 v2.1.176 12 Jun 2026

WebFetch: Artifact URLs Are Now Fetchable

The WebFetch tool description now explicitly documents that https://claude.ai/code/artifact/{uuid} URLs (including preview.claude.ai) are fetchable using your claude.ai login — you do not need curl or a headless browser for these. The Artifact tool description also now includes a note: "To read an existing artifact's content: call WebFetch with its URL."

Evidence

WebFetch description update (search for "https://claude.ai/code/artifact/" and "Exception: claude.ai/code/artifact/{uuid} URLs ARE fetchable")

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

See this entry in the whole of v2.1.176 →