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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.

← All of v2.1.172 Home All releases ←olderv2.1.170 v2.1.173newer→
Claude Code v2.1.172

Artifact Tool

Feature flag
tengu_cobalt_plinth On for this account, and not off by default

The flag server returned on for the one account this site reads, and nothing in this release compiles it off by default. The compiled default is shown below, and says which it is when we cannot read one: a fifth of gates compile in a string or a number rather than on or off, and most published releases have no gate table behind them at all. No client can see what the server returns for your account.

This account: on · anonymous baseline: on · compiled default in v2.1.172: on

These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.

Read once, for one account on one subscription tier, against v2.1.172. It isn't a statement about your account. What a flag value here can and cannot tell you

What

Claude can now render an HTML or Markdown file to a private, shareable web page hosted on claude.ai. The resulting URL can be shared with teammates.

Usage
Artifact(file_path="report.html", favicon="📊")
Artifact(file_path="notes.md", favicon="📝", label="v2")
Details
  • Accepts .html, .htm, and .md files; Markdown is converted to styled HTML automatically
  • The favicon parameter (required) sets the browser-tab emoji icon — use one or two emoji, no markup
  • The optional label parameter provides a human-readable version label shown in the version picker
  • The optional url parameter lets Claude redeploy to an existing artifact URL the user provides
  • A strict CSP blocks all external resources — inline all CSS/JS and embed assets as data: URIs
  • Same file path → same URL on redeploy; different file path → new URL
  • Controlled by the CLAUDE_CODE_DISABLE_ARTIFACT environment variable and the disableArtifact setting
  • Gated by feature flag tengu_cobalt_plinth; enabled for eligible claude.ai accounts
Evidence

Artifact tool implementation (search for "Render an HTML or Markdown file to an Artifact" and uAH = "Artifact")

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

See this entry in the whole of v2.1.172 →