DeFi Trading Agent MCP Server

Instructions

Implementation Reference

• src/toolService.js:567-578 (handler)

  Primary handler function for the 'get_gasless_chains' tool. Delegates to AgService and formats the response for MCP protocol.

  async getGaslessChains() {
    const result = await this.agg.getGaslessChains();
  
    return {
      message: "Gasless supported chains retrieved successfully",
      data: result,
      summary: `Found ${
        result.chains?.length || 0
      } chains supporting gasless swaps`,
      note: "These chains support meta-transaction based gasless swaps",
    };
  }

• src/services/agService.js:206-224 (helper)

  Core utility function in AgService that performs the HTTP request to retrieve gasless-supported chains from the aggregator backend.

  async getGaslessChains() {
    try {
      const response = await fetch(`${this.baseUrl}/api/swap/gasless/chains`);
      
      if (!response.ok) {
        throw new Error(`HTTP ${response.status}: ${response.statusText}`);
      }
      
      const data = await response.json();
      
      if (!data.success) {
        throw new Error(data.error || 'Gasless chains request failed');
      }
      
      return data.data;
    } catch (error) {
      throw new Error(`Failed to get gasless chains: ${error.message}`);
    }
  }

• src/index.js:743-752 (schema)

  Tool schema definition including name, description, and empty input schema (no parameters required).

  {
    name: TOOL_NAMES.GET_GASLESS_CHAINS,
    description:
      "Get list of blockchain networks that support gasless swaps",
    inputSchema: {
      type: "object",
      properties: {},
      required: [],
    },
  },

• src/index.js:1154-1156 (registration)

  Registration in the tool dispatch switch statement that routes calls to ToolService.getGaslessChains()

  case TOOL_NAMES.GET_GASLESS_CHAINS:
    result = await toolService.getGaslessChains();
    break;

• src/constants.js:15-15 (helper)

  Constant definition for the tool name used throughout the codebase.

  GET_GASLESS_CHAINS: "get_gasless_chains",