Basalt

by basalt-run

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About

Design system MCP server — query tokens, components, icons, and WCAG contrast data from Git-backed design systems.

Details

Author
basalt-run
Categories
Developer Tools, Design, Other

Setup

Install Basalt in your MCP client (Claude Desktop, Cursor, Windsurf, and others).

Repository: https://github.com/basalt-run/design-system

Follow the installation instructions in the repository README, then restart your MCP client.

Connect your AI coding tools to your design system. Basalt serves your design tokens, component specs, icons, and accessibility data via MCP so AI tools generate on-brand code — not hardcoded values.

Works with Claude Design, Claude Code, Cursor, Windsurf, and any MCP-compatible client.

Sign up atbasalt.run(free) and go to Settings → API Keys → Generate new key.

Cursor— add to~/.cursor/mcp.jsonor Settings → MCP:

{ "mcpServers": { "basalt": { "url": "https://basalt.run/api/mcp", "headers": { "Authorization": "Bearer bsk_your_key_here" } } } }
claude mcp add --transport http basalt https://basalt.run/api/mcp \ --header "Authorization: Bearer bsk_your_key_here"

Claude Desktop— add toclaude_desktop_config.json:

{ "mcpServers": { "basalt": { "url": "https://basalt.run/api/mcp", "headers": { "Authorization": "Bearer bsk_your_key_here" } } } }

Windsurf— Settings → MCP Servers, same config as Cursor.

AI coding tools hallucinate design values. They hardcode#3B82F6instead of usingvar(--color-action-default). They guess at component APIs instead of using your real props.

Basalt gives AI tools a structured, queryable source of truth for your design system. Tokens are stored in Git as DTCG 2025.10 JSON, edited visually in Basalt's web editor, and served via MCP.

Claude Design reads your codebase during onboarding to apply your brand. Basalt is where your brand is defined — tokens, components, documentation, all in Git. Edit in Basalt, commit to your repo, and Claude Design picks it up automatically.

- Website:basalt.run
- Token format:
DTCG 2025.10(W3C standard)
- SDK:
@modelcontextprotocol/sdk(Node.js)

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