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Lemma

by lemmaoracle

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

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Install Lemma

Pick your client, then add it in one click or paste the config.

STDIONode.js
~/Library/Application Support/Claude/claude_desktop_config.json
claude_desktop_config.json
{
  "mcpServers": {
    "mcp-305": {
      "command": "npx",
      "args": [
        "-y",
        "@lemmaoracle/mcp"
      ]
    }
  }
}

Settings → Developer → Edit Config, merge this into mcpServers, then fully quit and reopen Claude Desktop.

Automated check passed— started and listed 5 tools correctly (14d ago).

Overview

Tools5

What Lemma lets your agent do. Expand a tool for its parameters.

Verified live~1.4k tokens of context

Security & health

What it can reach and how reliably it runs — from our own checks, not the maintainer’s claims.

ActiveLast checked 3d ago

Recent health check succeeded.

10/10 checks healthy over the last 53d

What it can do

From the 5 tools this server returned when we ran it; 5 declare their own safety hints.

Makes network requests · 5Read-only tools · 5
Network at startup3 connections
Files written at startupNone
Install scriptsNone
npm provenanceNot published
Package age178 days
Maintainers1

Observed 2026-10-21 in an isolated sandbox. A description of reach, not a security audit.

Supply-chain signal

No high-severity advisories surfaced by our automated scan.

Critical 0High 0Medium 0Low 0

Scanned 8d ago via OSV.dev · @lemmaoracle/mcp (npm)

Adoption & maintenance

Factual signals from GitHub, npm, and our automated checks — not a rating.

GitHub stars1Stargazers on the source repository.
npm downloads169Package downloads in the last 30 days.
Last commit3d agoMost recent push to the default branch.
Availability100%Our rolling endpoint + install checks that succeeded.
Install checkPassedOur sandbox started it and listed its tools.
Tools exposed5Callable tools this server registers over MCP.
Directory activity1 viewsConfig copies, upvotes, and views on AllMCPs.

From the project README

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:

config.json
{
  "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

Read the full README View source on GitHub

Reviews

No reviews yet — be the first to share how it worked for you.

Frequently Asked Questions about Lemma

lemmaoracle/lemma is an MCP server that lets AI agents reason over confidential data using zero-knowledge proofs, selective disclosure, and tamper-evident provenance. It is distributed as @lemmaoracle/mcp, uses the official MCP SDK, and keeps raw content encrypted while exposing cryptographically verified attributes with records of their issuer, schema, proof, and verification anchor.

Connect it by configuring an MCP server named lemma with the command npx, the argument -y @lemmaoracle/mcp, and a LEMMA_API_KEY environment variable. This configuration can also be used with other MCP-compatible agents.

No, Lemma is designed to keep raw content encrypted while enabling reasoning through zero-knowledge proofs and selective disclosure. Attributes read by an AI agent carry cryptographically verified provenance rather than requiring exposure of the underlying plaintext.

Lemma provides permanent provenance for each attribute an AI reads, including who issued it, which schema defined it, how it was proven, and where its verification record is anchored.

Find the MCP package as @lemmaoracle/mcp on npm, with tool details, environment variables, and contributor build instructions in packages/mcp/README.md. The Lemma website and services information are available at lemma.frame00.com.

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