MCP Complete Implementation Guide

Instructions

Implementation Reference

• server.py:233-246 (handler)

  The handler function that implements get_system_info tool logic, collecting system details using platform and psutil libraries and returning as JSON.

  async def get_system_info(self) -> list[types.TextContent]:
      """Get system information"""
      info = {
          "platform": platform.system(),
          "arch": platform.machine(),
          "hostname": platform.node(),
          "cpus": psutil.cpu_count(),
          "totalMemory": f"{round(psutil.virtual_memory().total / (1024**3))} GB",
          "freeMemory": f"{round(psutil.virtual_memory().available / (1024**3))} GB",
          "uptime": f"{round(psutil.boot_time())} seconds",
          "pythonVersion": sys.version,
          "currentDirectory": str(Path.cwd()),
      }
      return [types.TextContent(type="text", text=json.dumps(info, indent=2))]

• server.js:270-291 (handler)

  The handler function implementing get_system_info tool, gathering Node.js os module system information and returning formatted JSON response.

  async getSystemInfo() {
    const info = {
      platform: os.platform(),
      arch: os.arch(),
      hostname: os.hostname(),
      cpus: os.cpus().length,
      totalMemory: Math.round(os.totalmem() / 1024 / 1024 / 1024) + ' GB',
      freeMemory: Math.round(os.freemem() / 1024 / 1024 / 1024) + ' GB',
      uptime: Math.round(os.uptime() / 3600) + ' hours',
      nodeVersion: process.version,
      currentDirectory: process.cwd(),
    };
  
    return {
      content: [
        {
          type: 'text',
          text: JSON.stringify(info, null, 2),
        },
      ],
    };
  }

• server.py:118-125 (schema)

  Schema definition for the get_system_info tool in the list_tools handler, specifying no input parameters.

  types.Tool(
      name="get_system_info",
      description="Get system information",
      inputSchema={
          "type": "object",
          "properties": {},
      },
  ),

• server.js:90-97 (schema)

  Schema for get_system_info tool returned by listToolsRequestHandler, with empty properties indicating no args needed.

  {
    name: 'get_system_info',
    description: 'Get system information',
    inputSchema: {
      type: 'object',
      properties: {},
    },
  },

• server.py:181-182 (registration)

  Registration/dispatch in the call_tool handler for invoking get_system_info.

  elif name == "get_system_info":
      return await self.get_system_info()