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io.github.lemmaoracle/mcp

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Verifiable provenance for AI agents — ZK proofs over confidential documents, no plaintext exposure.

Source code Website 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).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http io-github-lemmaoracle-mcp 'https://mcp.lemma.workers.dev/mcp' --header 'Authorization: <Lemma API key as Bearer token. Format: '\''Bearer <LEMMA_API_KEY>'\''. Get a key at https://lemma.frame00.com/services>'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "io-github-lemmaoracle-mcp": {
            "type": "http",
            "url": "https://mcp.lemma.workers.dev/mcp",
            "headers": {
                "Authorization": "<Lemma API key as Bearer token. Format: 'Bearer <LEMMA_API_KEY>'. Get a key at https://lemma.frame00.com/services>"
            }
        }
    }
}
NPM package @lemmaoracle/mcp
Claude Code 
claude mcp add io-github-lemmaoracle-mcp -e 'LEMMA_API_KEY=<your lemma_api_key>' -e 'LEMMA_API_BASE=<LEMMA_API_BASE>' -- npx -y @lemmaoracle/mcp@0.0.17
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "io-github-lemmaoracle-mcp": {
            "command": "npx",
            "args": [
                "-y",
                "@lemmaoracle/mcp@0.0.17"
            ],
            "env": {
                "LEMMA_API_KEY": "<your lemma_api_key>",
                "LEMMA_API_BASE": "<LEMMA_API_BASE>"
            }
        }
    }
}

Environment variables

  • LEMMA_API_KEY required secret Lemma API key (Bearer token). Get one at https://lemma.frame00.com/services
  • LEMMA_API_BASE Optional API base URL. Defaults to production endpoint.

Documentation

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

Contents
  1. Lemma Oracle
  2. Learn more
  3. MCP server
  4. Packages
  5. Contact
  6. License

Lemma Oracle

Give AI proven facts.

Lemma is a cryptographically verified truth layer for agent AI. It lets AI reason over confidential data via zero-knowledge proofs, selective disclosure, and tamper-evident provenance — while raw content stays encrypted.

Every attribute an AI reads through Lemma carries permanent provenance: who issued it, which schema defined it, how it was proven, and where its verification record is anchored.

Learn more

MCP server

@lemmaoracle/mcp is the Model Context Protocol (MCP) server for Lemma, published on npm and built with the official MCP SDK (@modelcontextprotocol/sdk). Point Claude Desktop or any MCP-compatible agent at it:

{
  "mcpServers": {
    "lemma": {
      "command": "npx",
      "args": ["-y", "@lemmaoracle/mcp"],
      "env": { "LEMMA_API_KEY": "YOUR_API_KEY" }
    }
  }
}

Tool list, env vars, and contributor build: packages/mcp/README.md · npm

Packages

Public packages in this monorepo:

  • packages/mcp/ — @lemmaoracle/mcp, the Model Context Protocol (MCP) server for AI agents (this is the package above).
  • packages/sdk/ — @lemmaoracle/sdk, TypeScript SDK for the Lemma API.
  • packages/spec/ — @lemmaoracle/spec, OpenAPI spec + shared TypeScript types.
  • packages/x402/ — @lemmaoracle/x402, x402 payment middleware drop-in.

Contact

For partnership and implementation inquiries, please use the contact form: https://lemma.frame00.com/services

License

This repository uses different licenses for different packages:

PackageLicense
packages/contracts, packages/relay, packages/passthroughBUSL-1.1 (changes to Apache-2.0 on 2030-05-01)
packages/sdk, packages/spec, packages/mcp, packages/parser, packages/x402Apache-2.0
packages/webPrivate (not distributed)

The root LICENSE file applies as the default. Each package may contain its own LICENSE file that takes precedence.

© 2026 FRAME00 Inc.

🇯🇵 日本語版はこちら / Japanese README

Frequently asked questions

What is io.github.lemmaoracle/mcp?

Verifiable provenance for AI agents — ZK proofs over confidential documents, no plaintext exposure.

How do I install io.github.lemmaoracle/mcp?

It runs as a remote server. In Claude Code: claude mcp add --transport http io-github-lemmaoracle-mcp 'https://mcp.lemma.workers.dev/mcp' --header 'Authorization: <Lemma API key as Bearer token. Format: '\''Bearer <LEMMA_API_KEY>'\''. Get a key at https://lemma.frame00.com/services>'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does io.github.lemmaoracle/mcp need an API key?

Yes. It expects LEMMA_API_KEY, Authorization, which you set in its configuration.

Is io.github.lemmaoracle/mcp open source?

Its code is public on GitHub, but the repository does not declare a standard license.

Who maintains io.github.lemmaoracle/mcp?

It is published by lemmaoracle. 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.