Verifiable provenance for AI agents — ZK proofs over confidential documents, no plaintext exposure.
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.
@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
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.For partnership and implementation inquiries, please use the contact form: https://lemma.frame00.com/services
This repository uses different licenses for different packages:
| Package | License |
|---|---|
packages/contracts, packages/relay, packages/passthrough | BUSL-1.1 (changes to Apache-2.0 on 2030-05-01) |
packages/sdk, packages/spec, packages/mcp, packages/parser, packages/x402 | Apache-2.0 |
packages/web | Private (not distributed) |
The root LICENSE file applies as the default. Each package may contain its own LICENSE file that takes precedence.
© 2026 FRAME00 Inc.
Source-derived launch command. Check the maintainer’s required arguments and credentials before running:
npx -y @lemmaoracle/mcpMerge this template into ~/Library/Application Support/Claude/claude_desktop_config.json. Keep existing servers. Add any arguments, credentials, and permissions required by the maintainer; this template has not been install-tested.
{
"mcpServers": {
"io-github-lemmaoracle-mcp": {
"command": "npx",
"args": [
"-y",
"@lemmaoracle/mcp"
]
}
}
}Restart Claude Desktop completely for changes to take effect. Confirm the server appears connected in the client’s tool list, then try a read-only example from its documentation.
Claude Desktop setup referenceio.github.lemmaoracle/mcp works with any MCP-compatible client. Copy the config snippet from the Configuration section above and add it to the file shown for your client, then restart the application.
~/Library/Application Support/Claude/claude_desktop_config.jsonRestart Claude Desktop completely for changes to take effect.~/.cursor/mcp.jsonRestart Cursor for changes to take effect..vscode/mcp.jsonReload VS Code window for changes to take effect.~/.codeium/windsurf/mcp_config.jsonRestart Windsurf for changes to take effect..mcp.jsonSave at the project root, then start Claude Code in that project and review the MCP server approval prompt. Keep real credentials out of shared files.