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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 v2.1.179 16 Jun 2026

Claude Design MCP Integration [Gradual Rollout]

What

A built-in first-party MCP server called claude_design is now available, connecting to Anthropic's Design API at https://api.anthropic.com/v1/design/mcp. When enabled, Claude can mock up UI screens directly in your session. A tip reads "Use Claude Design to mock up screens before you build."

Status

Controlled by feature flag tengu_omelette_whisk. Can also be force-enabled via the environment variable CLAUDE_CODE_ENABLE_DESIGN_MCP=true.

Details

Server name claude_design is treated as first-party — it auto-attaches login OAuth tokens and renders with a bare name (no URL prefix in the UI)
Setting CLAUDE_CODE_ENABLE_DESIGN_MCP=1 bypasses the feature flag for self-hosting or testing

Evidence

Design MCP server name (search for "claude_design") and URL (search for "https://api.anthropic.com/v1/design/mcp")

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

See this entry in the whole of v2.1.179 →