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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

Custom artifact viewer host, not yet resolvable

Not switched on
Useful2 Signal4
Artifacts Notable not in their notes

An env var for a custom artifact viewer host is recognised but currently ignored.

CLAUDE_CODE_ARTIFACT_VIEWER_BASE_URL is recognised and URL building asks a resolver for the host, but that resolver returns nothing.

CLAUDE_CODE_ARTIFACT_VIEWER_BASE_URL
What

CLAUDE_CODE_ARTIFACT_VIEWER_BASE_URL is a new recognised environment variable, and artifact URL parsing and building now ask a resolver for the viewer host instead of assuming claude.ai or the staging host. In this build that resolver has an empty body and returns nothing, so the variable is never read and URLs still resolve to the built-in hosts.

Evidence

CLAUDE_CODE_ARTIFACT_VIEWER_BASE_URL

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 v2.1.229 →