MCP3 SDK & Developer Guide

The MCP3 SDK provides utilities to generate, sign, verify, and consume Machine Context Objects (MCOs), enabling seamless integration of contextual identity into AI agents and Web3 applications.

📦 Installation

Node.js / TypeScript:

npm install @mcp3/sdk

or

yarn add @mcp3/sdk

Works in browser and server environments.

📐 Architecture: SDK Module Overview

graph TD;
    UserWallet -->|signs| MCOBuilder;
    MCOBuilder --> MCO;
    MCO -->|sent to| AIClient;
    AIClient -->|formats prompt| LLM;
    Verifier -->|validates| MCO;
    Agent -->|context-aware| Interaction;

    subgraph SDK
        MCOBuilder
        AIClient
        Verifier
    end

🏗️ 1. Constructing an MCO (Client Side)

import { buildMCO } from '@mcp3/sdk/client'

const context = {
    scopes: ['read.dao', 'read.tokens'],
    subject: '0xabc...',
    dao: {
        memberships: ['metadao.eth'],
        recentVotes: ['proposal_45', 'proposal_46']
    },
    wallet: {
        tokenBalances: [
            { symbol: 'ETH', amount: 1.34 },
            { symbol: 'USDC', amount: 430.0 }
        ]
    }
}

const mco = await buildMCO(context, signer)  // signer = ethers.Wallet or window.ethereum

✅ 2. Verifying an MCO (Server Side)

import { verifyMCO } from '@mcp3/sdk/server'

const result = verifyMCO(mco)

if (result.valid) {
    console.log("MCO is authentic:", result.payload)
} else {
    throw new Error("Invalid or expired MCO")
}

🧠 3. Integrating with LLM Agents

import { generatePrompt } from '@mcp3/sdk/agent'

const prompt = generatePrompt({
    basePrompt: "You are a DAO governance advisor.",
    context: mco
})

const llmResponse = await callLLM(prompt)

🧪 4. Handling ZK Proofs

import { generateZKClaim } from '@mcp3/sdk/zk'

const claim = await generateZKClaim({
    type: 'age_over_18',
    identity: userSemaphoreIdentity
})

// Embed in MCO
context.zk = claim

⚙️ 5. Using Delegated Signing Keys

import { createDelegatedSigner } from '@mcp3/sdk/crypto'

const delegated = createDelegatedSigner({
    parentKey: userWallet.privateKey,
    scopes: ['read.profile'],
    expiresIn: 3600
})

📡 6. Uploading to IPFS

import { uploadToIPFS } from '@mcp3/sdk/storage'

const ipfsUrl = await uploadToIPFS(mco)

console.log("Persistent MCO at:", ipfsUrl)

🧩 7. Prompt Engineering Helpers

import { createSystemPrompt } from '@mcp3/sdk/llm'

const systemPrompt = createSystemPrompt({
    role: "investment advisor",
    context: mco,
    includeZK: true
})

📘 Example: Full Flow

import {
    buildMCO, verifyMCO,
    generatePrompt, callLLM
} from '@mcp3/sdk'

const mco = await buildMCO(context, signer)
const prompt = generatePrompt({ basePrompt, context: mco })
const answer = await callLLM(prompt)

📊 Developer Dashboard (Planned)

Coming soon:

  • 🔍 MCO Explorer (decode/view signed objects)

  • 🔐 Delegation UI

  • 🧪 Proof Playground

  • ⚙️ Prompt Builder with context injection

📚 SDK Reference

Module
Description

@mcp3/sdk/client

Build & sign context objects

@mcp3/sdk/server

Verify and decode MCOs

@mcp3/sdk/zk

Generate ZK proofs

@mcp3/sdk/llm

Format LLM-compatible prompts

@mcp3/sdk/crypto

Signer tools and delegation

@mcp3/sdk/storage

Upload MCO to IPFS or Arweave

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