opticquiz-cvd-mcp

An MCP server that lets an LLM call the OpticQuiz colorblind-safe checker as a native tool. Built on the opticquiz-cvd engine (Machado 2009 + CIEDE2000). Runs locally over stdio; nothing leaves your machine.

Tools

• check_palette — { colors: string[] } → whether the palette stays distinguishable under protan/deutan/tritan, with the conflicting pairs.
• simulate_color — { color: string, type: "protan"|"deutan"|"tritan" } → how that color appears under that deficiency.

Add it to Claude Desktop

Edit claude_desktop_config.json (Settings → Developer → Edit Config) and add:

{
  "mcpServers": {
    "opticquiz-cvd": {
      "command": "npx",
      "args": ["-y", "opticquiz-cvd-mcp"]
    }
  }
}

Restart Claude Desktop. Then ask, e.g., "Is this palette colorblind-safe: #d7191c, #1a9641, #2166ac?" — it calls the tool. Same config shape works in Cursor and other MCP clients.

Note

A screening aid, not a legal accessibility (ADA/WCAG) audit. Method: Machado, Oliveira & Fernandes (2009) + CIEDE2000 — https://doi.org/10.5281/zenodo.21310578