MetaMask MCP

import type { Config } from "@wagmi/core"; import type { FastMCP } from "fastmcp"; import { signMessage } from "@wagmi/core"; import { z } from "zod"; import { JSONStringify } from "../utils/json-stringify"; export function registerSignMessageTools(server: FastMCP, wagmiConfig: Config): void { server.addTool({ name: "sign-message", description: "Sign a message.", parameters: z.object({ message: z.string().describe("Message to sign."), }), execute: async (args, { log }) => { try { const message = args.message; const result = await signMessage(wagmiConfig, { message, }); return { content: [ { type: "text", text: JSONStringify({ hash: result, }), }, ], }; } catch (error) { log.debug((error as Error).message); throw error; } }, }); };