# Open Primitive

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

Canonical: https://claudelist.com/listings/mcp-reg-io-github-writesdavid-open-primitive-74931d0c88

Category: MCP Servers

Source: community · writesdavid

Source checked: 2026-10-14

Website: https://www.claudemcp.org/mcp/registry/io-github-writesdavid-open-primitive-74931d0c8811.html

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

## Install or set up

1. Review the publisher repository and npm package `open-primitive-mcp@1.2.0` before running it. The MCP Registry declares this package as a stdio server.
2. Install Node.js, then run the command below in your Claude Code project. Check the publisher README for any account or configuration requirements.
3. Restart Claude Code and use `/mcp` to confirm the connection and review its tools and permissions.

```sh
claude mcp add mcp-io-github-writesdavid-open-primitive-74931d -- npx -y open-primitive-mcp@1.2.0
```

Installation guide: https://github.com/writesdavid/open-primitive-api