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Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.172 ·

Artifact Tool

Entry
JSON All of v2.1.172
EntryKind: in v2.1.172,
New FeaturesSection of the release
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.

Read from
Feature flag
tengu_cobalt_plinth Off by default, switched on for this account

The shipped code defaults this off, and the flag server returned on for the one account this site reads on this version. That is the reading that makes the entry above worth a second look, and it still says nothing about your account.

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

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 has happened since
Flag reading moved The flag server now returns on for tengu_cobalt_plinth, read as this account. A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.
Flag reading moved The flag server now returns nothing at all, having stopped carrying it for tengu_cobalt_plinth, read as this account. A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.
Gate removed from the code v2.1.260 removed the tengu_cobalt_plinth gate from the code while it was still reading on for the account this site reads. The code path no longer asks a flag before it runs.

See this across every release →

How sure we are
One source agreesOne thing we can check says the same as this entry.
The name it cites is new in this buildNew in this build: tengu_cobalt_plinth

See this entry in the whole of v2.1.172 →

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