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io.github.writesdavid/open-primitive

Official registry Other

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

Source code Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

NPM package open-primitive-mcp
Claude Code 
claude mcp add open-primitive -- npx -y open-primitive-mcp@1.2.0
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "open-primitive": {
            "command": "npx",
            "args": [
                "-y",
                "open-primitive-mcp@1.2.0"
            ]
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. Open Primitive Protocol (OPP)
  2. The Problem
  3. The Protocol
  4. Conformance Levels
  5. Reference Implementation
  6. Quick Start
  7. Specification
  8. SDK
  9. MCP Server
  10. Links
  11. License

Open Primitive Protocol (OPP)

The data layer of the agent internet.

OPP defines how data providers make their data agent-consumable, verifiable, and discoverable. Three components: provider manifest, response envelope, query interface.

The Problem

Agents get data naked. No provenance. No freshness guarantee. No confidence score. No way to verify the source. The agent internet is missing its data envelope.

The Protocol

ComponentWhat it does
Manifest (/.well-known/opp.json)Declares what data a provider serves, how fresh it is, how to verify it
Response EnvelopeEvery response carries domain, source, freshness, confidence, citation, Ed25519 signature
Query InterfaceStandardized HTTP GET endpoints with predictable parameters

Conformance Levels

  • Level 1 (Basic): Manifest + envelope with domain/source/freshness
  • Level 2 (Cited): Level 1 + confidence scores + citations
  • Level 3 (Verified): Level 2 + Ed25519 cryptographic proof

Reference Implementation

Live at api.openprimitive.com. 16 US federal data domains across 11 agencies. Level 3 compliant — every response is signed.

curl https://api.openprimitive.com/v1/drugs?name=aspirin
# Returns OPP envelope with proof.type: "DataIntegrityProof"

Quick Start

Use data from an OPP provider:

const res = await fetch('https://api.openprimitive.com/v1/drugs?name=aspirin');
const data = await res.json();
console.log(data.citations.statement);
// "According to FDA FAERS, aspirin has 601,477 reported adverse events"

Implement OPP for your own data:

// 1. Create /.well-known/opp.json (see spec)
// 2. Wrap responses in the OPP envelope
// 3. Optionally sign with Ed25519

Specification

Full spec: openprimitive.com/protocol.html

Detailed spec: api.openprimitive.com/spec.html

SDK

  • sdk/opp-client.js — Client library for consuming OPP providers
  • sdk/opp-provider.js — Helper for implementing OPP
  • sdk/opp-validator.js — Validate OPP conformance

MCP Server

13 tools for Claude, Cursor, and MCP-compatible agents:

npx open-primitive-mcp

License

MIT

Frequently asked questions

What is io.github.writesdavid/open-primitive?

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

How do I install io.github.writesdavid/open-primitive?

It runs on your machine. In Claude Code: claude mcp add open-primitive -- npx -y open-primitive-mcp@1.2.0. For other clients, paste the JSON configuration from this page into their MCP settings.

Does io.github.writesdavid/open-primitive need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is io.github.writesdavid/open-primitive open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains io.github.writesdavid/open-primitive?

It is published by writesdavid. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.