PEAC

Add PEAC to an MCP Server

Attach a signed interaction record to every MCP tool response. Records travel in the _meta field, invisible to model context.

Install

pnpm add @peac/protocol @peac/crypto

Issue a record from a tool handler

import { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js'
import { issueWire02 } from '@peac/protocol'
import { generateKeypair } from '@peac/crypto'
import { z } from 'zod'

const { privateKey } = await generateKeypair()
const server = new McpServer({ name: 'my-server', version: '1.0.0' })

server.tool('lookup', { query: z.string() }, async ({ query }) => {
  const { jws } = await issueWire02({
    iss: 'https://my-server.example.com',
    kind: 'evidence',
    type: 'org.peacprotocol/access',
    pillars: ['access'],
    privateKey,
    kid: 'peac-2026-03',
  })

  return {
    content: [{ type: 'text', text: 'result' }],
    _meta: {
      'org.peacprotocol/receipt_jws': jws,
    },
  }
})

The @peac/mcp-server package provides a ready-to-run MCP server with built-in receipt issuance and policy configuration.

MCP integration docsFull quickstartSpecification