Open Primitive API MCP Server: Install & Setup

Install Open Primitive API in Claude Code

Claude Code

claude mcp add open-primitive-api -- npx -y open-primitive-mcp

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "open-primitive-api": {
      "command": "npx",
      "args": [
        "-y",
        "open-primitive-mcp"
      ]
    }
  }
}

Frequently asked questions

What does the Open Primitive API MCP server do?

33 tools, 30 US federal data domains. Ed25519 signed, provenance chains, entity graph. Free.

Is the Open Primitive API MCP server free?

Yes, most likely. Open source and no paid account or API key is mentioned in the listing. Check the provider for current pricing.

Does Open Primitive API run locally or remotely?

Local. Runs on your machine (stdio). You install it with npx, uvx, Docker or from source.

How do I add Open Primitive API to Claude Code?

Run: claude mcp add open-primitive-api -- npx -y open-primitive-mcp

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