MetaMask MCP

import type { Config } from "@wagmi/core"; import type { FastMCP } from "fastmcp"; import { deployContract } from "@wagmi/core"; import { Abi } from "abitype/zod"; import { TransactionExecutionError } from "viem"; import { z } from "zod"; import { Calldata } from "../utils/evm-schema"; import { JSONStringify } from "../utils/json-stringify"; export function registerDeployContractTools(server: FastMCP, wagmiConfig: Config): void { server.addTool({ name: "deploy-contract", description: "Deploy a contract to the network, given bytecode, and constructor arguments.", parameters: z.object({ abi: Abi.describe("The contract's ABI."), args: z.unknown().array().optional().describe("Arguments to pass when deploying the contract. Inferred from abi."), bytecode: Calldata.describe("The contract's bytecode."), }), execute: async (args) => { try { const result = await deployContract(wagmiConfig, args); return { content: [ { type: "text", text: JSONStringify({ hash: result, }), }, ], }; } catch (error) { if (error instanceof TransactionExecutionError) { return { content: [ { type: "text", text: error.cause.message, }, ], }; } return { content: [ { type: "text", text: (error as Error).message, }, ], }; } }, }); };