MetaMask MCP

import type { Config, GetBlockParameters } from "@wagmi/core"; import type { FastMCP } from "fastmcp"; import { getBlock } from "@wagmi/core"; import { Address } from "abitype/zod"; import { z } from "zod"; import { JSONStringify } from "../utils/json-stringify"; export function registerGetBlockTools(server: FastMCP, wagmiConfig: Config): void { server.addTool({ name: "get-block", description: "Fetch information about a block at a block number, hash or tag.", parameters: z.object({ chainId: z.coerce.number().optional().describe("ID of chain to use when fetching data."), blockHash: Address.optional().describe("Information at a given block hash."), blockNumber: z.coerce.bigint().optional().describe("Information at a given block number."), blockTag: z.enum(["latest", "earliest", "pending", "safe", "finalized"]).optional().default("latest").describe("Information at a given block tag. Defaults to 'latest'."), }), execute: async (args) => { const chainId = args.chainId as typeof wagmiConfig["chains"][number]["id"]; const blockHash = args.blockHash; const blockNumber = args.blockNumber; const blockTag = args.blockTag; const parameters: GetBlockParameters = { chainId, includeTransactions: false, }; if (blockHash) { parameters.blockHash = blockHash; } else if (blockNumber) { parameters.blockNumber = blockNumber; } else if (blockTag) { parameters.blockTag = blockTag; } const result = await getBlock(wagmiConfig, parameters); return { content: [ { type: "text", text: JSONStringify(result), }, ], }; }, }); };