Open Primitive

16 US federal data domains as MCP tools. Signed responses with provenance.

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.

Add to Cursor Add to VS Code

Manual Client & Custom JSON ConfigExpand JSON ▾

Client Config & Setup

Choose your client or environment

Target File:~/Library/Application Support/Claude/claude_desktop_config.json

claude_desktop_config.json

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

💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.

Documentation Overview

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

Component	What it does
Manifest (`/.well-known/opp.json`)	Declares what data a provider serves, how fresh it is, how to verify it
Response Envelope	Every response carries domain, source, freshness, confidence, citation, Ed25519 signature
Query Interface	Standardized 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.

Terminal

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

Quick Start

Use data from an OPP provider:

server.ts

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:

javascript

// 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:

Terminal

npx open-primitive-mcp

License

MIT

Read the full README →View source on GitHub →

Related MCP Servers

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Reviews

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Frequently Asked Questions about Open Primitive

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "open-primitive": { "command": "npx", "args": ["-y", "open-primitive"] } }

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Technical Specs & Signals

CategoryDeveloper Tools

27Quality signal: Emerging · 27/100How this signal is calculated ▾

Server availabilityNot measured

Not scored for repo-hosted servers — we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.

Verified ownership8/20

Documentation & tools11/30

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Community engagement0/10

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More in 💻 Developer Tools →Best MCP servers for Developers →Alternatives to Open Primitive →Install in Claude Desktop Install in Cursor Install in VS Code

Documentation Overview

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

Component	What it does
Manifest (`/.well-known/opp.json`)	Declares what data a provider serves, how fresh it is, how to verify it
Response Envelope	Every response carries domain, source, freshness, confidence, citation, Ed25519 signature
Query Interface	Standardized 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.

Terminal

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

Quick Start

Use data from an OPP provider:

server.ts

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:

javascript

// 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:

Terminal

npx open-primitive-mcp

License

MIT

Open Primitive

Quick Install

Client Config & Setup

Documentation Overview

Open Primitive Protocol (OPP)

The Problem

The Protocol

Conformance Levels

Reference Implementation

Quick Start

Specification

SDK

MCP Server

Links

License

Related MCP Servers

Reviews

Frequently Asked Questions about Open Primitive

AllMCPs Directory Badge

Technical Specs & Signals

Moxie Docs MCP

Own this project?

Share & Embed

Explore more

Open Primitive

Quick Install

Client Config & Setup

Documentation Overview

Open Primitive Protocol (OPP)

The Problem

The Protocol

Conformance Levels

Reference Implementation

Quick Start

Specification

SDK

MCP Server

Links

License

Related MCP Servers

Reviews

Frequently Asked Questions about Open Primitive

AllMCPs Directory Badge

Technical Specs & Signals

Moxie Docs MCP

Own this project?

Share & Embed

Explore more