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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 v2.1.242 Home All releases ←olderv2.1.241 v2.1.243newer→
Claude Code v2.1.242

Artifact tool manifests are checked before publish, and app built-ins refused

You'll notice
Useful2 Signal4
Artifacts

Pages must declare MCP servers this session actually has, and the Claude app's own built-ins are refused.

What

A page that declares which MCP servers it needs is now validated against the servers this session is actually connected to before it can be published, with each failure named rather than a generic error. Pages declaring the Claude app's own built-in servers (cowork, scheduled-tasks, session_info, workspace) are refused.

Details
  • Failure reasons include not_object, no_servers, entry_shape, no_tools, tools_shape, tool_name, opaque_id, known_id, connector_as_host and undeclarable_name.
  • Duplicate entries that resolve to the same server are merged, and manifests are rejected outright if they declare too many tools or too many servers.
  • The guidance shown to Claude changes depending on whether the session has claude.ai connectors and a meta connector.
Evidence

manifest entries resolve to

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

See this entry in the whole of v2.1.242 →