MCP Ethers Wallet

Implementation Reference

• src/tools/core.ts:84-97 (handler)

  The async handler function that executes the getGasPrice tool. It retrieves the current gas price in wei using ethersService, converts it to gwei, and returns a formatted text response. Handles errors using createErrorResponse.

  async ({ provider, chainId }) => {
    try {
      const gasPriceWei = await ethersService.getGasPrice(provider, chainId);
      const gasPriceGwei = ethers.formatUnits(gasPriceWei, "gwei");
      return {
        content: [{ 
          type: "text", 
          text: `Current gas price: ${gasPriceGwei} gwei (${gasPriceWei.toString()} wei)`
        }]
      };
    } catch (error) {
      return createErrorResponse(error, 'getting gas price');
    }
  }

• src/tools/core.ts:78-83 (schema)

  Zod schema defining the input parameters for the getGasPrice tool: optional provider (network name or RPC URL) and chainId.

  {
    provider: z.string().optional().describe(PROVIDER_DESCRIPTION),
    chainId: z.number().optional().describe(
      "Optional. The chain ID to use. If provided with a named network and they don't match, the RPC's chain ID will be used."
    )
  },

• src/tools/core.ts:76-98 (registration)

  Complete registration of the getGasPrice MCP tool using server.tool(name, inputSchema, handler), within the registerCoreTools function.

  server.tool(
    "getGasPrice",
    {
      provider: z.string().optional().describe(PROVIDER_DESCRIPTION),
      chainId: z.number().optional().describe(
        "Optional. The chain ID to use. If provided with a named network and they don't match, the RPC's chain ID will be used."
      )
    },
    async ({ provider, chainId }) => {
      try {
        const gasPriceWei = await ethersService.getGasPrice(provider, chainId);
        const gasPriceGwei = ethers.formatUnits(gasPriceWei, "gwei");
        return {
          content: [{ 
            type: "text", 
            text: `Current gas price: ${gasPriceGwei} gwei (${gasPriceWei.toString()} wei)`
          }]
        };
      } catch (error) {
        return createErrorResponse(error, 'getting gas price');
      }
    }
  );