{"name":"CLAUDE_CODE_ENABLE_DESIGN_MCP","slug":"claude-code-enable-design-mcp","family":"env","title":"Environment variables","noun":"environment variable","description":"Forces the built-in Claude Design MCP server on (`1`, `true`, `yes`, `on`) or off (`0`, `false`, `no`, `off`); unset or any other value falls back to the `tengu_omelette_whisk` flag, default off. When on and the API provider is first-party, Claude Code adds an HTTP MCP server named `claude_design` at `https:\/\/api.anthropic.com\/v1\/design\/mcp` to its built-in servers, and it also enables the `\/design` command, which another condition can enable as well.","description_source":"code","described_by":{"bundle":"2.1.205","author":"claude-opus-5-5"},"presence":{"first_seen":"2.1.179","removed_in":"2.1.206","in_current_build":false,"newest_mined":"2.1.308","builds":21,"mined_builds":149,"first_cited":null},"aliases":[],"entries":[{"version":"2.1.179","anchor":"claude-design-mcp-integration-gradual-rollout","heading":"Claude Design MCP Integration [Gradual Rollout]","line":null,"released_at":"2026-06-16 17:51:27","reason":"found in this entry's text"}],"entries_total":1,"docs":[],"docs_total":0,"gates":[],"related":[{"name":"CLAUDE_CODE_ENABLE_DESIGN_SYNC","slug":"claude-code-enable-design-sync","description":null}],"url":"https:\/\/changelogs.core-directive.com\/reference\/env\/claude-code-enable-design-mcp","family_url":"https:\/\/changelogs.core-directive.com\/reference\/env.json"}