MCP Crypto Wallet EVM

Instructions

Implementation Reference

• src/handlers/wallet.ts:600-619 (handler)

  The handler function that executes the provider_estimate_gas tool by calling estimateGas on the provider with the input transaction.

  export const estimateGasHandler = async (input: any): Promise<ToolResultSchema> => {
    try {
      if (!input.transaction) {
        return createErrorResponse("Transaction is required");
      }
  
      const provider = getProvider();
      if (!provider) {
        return createErrorResponse("Provider is required to estimate gas, please set the provider URL");
      }
      const gasEstimate = await provider.estimateGas(input.transaction);
  
      return createSuccessResponse(
      `Gas estimate retrieved successfully
        Gas estimate: ${gasEstimate.toString()}
      `);
    } catch (error) {
      return createErrorResponse(`Failed to estimate gas: ${(error as Error).message}`);
    }
  };

• src/tools.ts:450-469 (schema)

  The input schema definition for the provider_estimate_gas tool in the tools array.

  {
    name: "provider_estimate_gas",
    description: "Estimate the gas required for a transaction",
    inputSchema: {
      type: "object",
      properties: {
        transaction: { 
          type: "object", 
          description: "The transaction to estimate gas for",
          properties: {
            to: { type: "string" },
            from: { type: "string" },
            data: { type: "string" },
            value: { type: "string" }
          }
        }
      },
      required: ["transaction"]
    }
  },

• src/tools.ts:595-595 (registration)

  Registration mapping the tool name 'provider_estimate_gas' to its handler function in the handlers dictionary.

  "provider_estimate_gas": estimateGasHandler,