EVM MCP Server

Instructions

Implementation Reference

• src/index.ts:134-155 (handler)

  The handler function for the web3_sha3 tool. It takes hex data input, calls the RPC web3_sha3 method, formats the hash result, and handles errors.

  async ({ data }) => {
    try {
      const result = await makeRPCCall("web3_sha3", [data]);
      return {
        content: [
          {
            type: "text",
            text: formatResponse(result, "Keccak-256 Hash"),
          },
        ],
      };
    } catch (error: any) {
      return {
        content: [
          {
            type: "text",
            text: `Error: ${error.message}`,
          },
        ],
      };
    }
  },

• src/index.ts:132-133 (schema)

  Input schema using Zod for the data parameter: a hex string starting with 0x.

    data: z.string().describe("Data to hash (hex string starting with 0x)"),
  },

• src/index.ts:128-133 (registration)

  Registration of the web3_sha3 tool via server.tool, including name, description, and schema.

  server.tool(
    "web3_sha3",
    "Returns Keccak-256 hash of the given data",
    {
      data: z.string().describe("Data to hash (hex string starting with 0x)"),
    },

• src/index.ts:89-96 (helper)

  Helper function used by the handler to perform the actual RPC call to the Ethereum provider.

  async function makeRPCCall(method: string, params: any[] = []): Promise<any> {
    try {
      const result = await provider.send(method, params);
      return result;
    } catch (error: any) {
      throw new Error(`RPC call failed: ${error.message}`);
    }
  }