自定义工具

import { query } from "@anthropic-ai/claude-agent-sdk";

// 在查询中使用自定义工具和流式输入
async function* generateMessages() {
  yield {
    type: "user" as const,
    message: {
      role: "user" as const,
      content: "旧金山的天气怎么样？"
    }
  };
}

for await (const message of query({
  prompt: generateMessages(),  // 使用异步生成器进行流式输入
  options: {
    mcpServers: {
      "my-custom-tools": customServer  // 作为对象/字典传递，而不是数组
    },
    // 可选择指定 Claude 可以使用哪些工具
    allowedTools: [
      "mcp__my-custom-tools__get_weather",  // 允许天气工具
      // 根据需要添加其他工具
    ],
    maxTurns: 3
  }
})) {
  if (message.type === "result" && message.subtype === "success") {
    console.log(message.result);
  }
}

const multiToolServer = createSdkMcpServer({
  name: "utilities",
  version: "1.0.0",
  tools: [
    tool("calculate", "执行计算", { /* ... */ }, async (args) => { /* ... */ }),
    tool("translate", "翻译文本", { /* ... */ }, async (args) => { /* ... */ }),
    tool("search_web", "搜索网络", { /* ... */ }, async (args) => { /* ... */ })
  ]
});

// 仅允许特定工具和流式输入
async function* generateMessages() {
  yield {
    type: "user" as const,
    message: {
      role: "user" as const,
      content: "计算 5 + 3 并将 'hello' 翻译成西班牙语"
    }
  };
}

for await (const message of query({
  prompt: generateMessages(),  // 使用异步生成器进行流式输入
  options: {
    mcpServers: {
      utilities: multiToolServer
    },
    allowedTools: [
      "mcp__utilities__calculate",   // 允许计算器
      "mcp__utilities__translate",   // 允许翻译器
      // "mcp__utilities__search_web" 不被允许
    ]
  }
})) {
  // 处理消息
}

import { z } from "zod";

tool(
  "process_data",
  "使用类型安全处理结构化数据",
  {
    // Zod 模式定义运行时验证和 TypeScript 类型
    data: z.object({
      name: z.string(),
      age: z.number().min(0).max(150),
      email: z.string().email(),
      preferences: z.array(z.string()).optional()
    }),
    format: z.enum(["json", "csv", "xml"]).default("json")
  },
  async (args) => {
    // args 基于模式完全类型化
    // TypeScript 知道：args.data.name 是字符串，args.data.age 是数字等
    console.log(`正在将 ${args.data.name} 的数据处理为 ${args.format}`);
    
    // 您的处理逻辑在这里
    return {
      content: [{
        type: "text",
        text: `已处理 ${args.data.name} 的数据`
      }]
    };
  }
)

tool(
  "fetch_data",
  "从 API 获取数据",
  {
    endpoint: z.string().url().describe("API 端点 URL")
  },
  async (args) => {
    try {
      const response = await fetch(args.endpoint);
      
      if (!response.ok) {
        return {
          content: [{
            type: "text",
            text: `API 错误：${response.status} ${response.statusText}`
          }]
        };
      }
      
      const data = await response.json();
      return {
        content: [{
          type: "text",
          text: JSON.stringify(data, null, 2)
        }]
      };
    } catch (error) {
      return {
        content: [{
          type: "text",
          text: `获取数据失败：${error.message}`
        }]
      };
    }
  }
)

const databaseServer = createSdkMcpServer({
  name: "database-tools",
  version: "1.0.0",
  tools: [
    tool(
      "query_database",
      "执行数据库查询",
      {
        query: z.string().describe("要执行的 SQL 查询"),
        params: z.array(z.any()).optional().describe("查询参数")
      },
      async (args) => {
        const results = await db.query(args.query, args.params || []);
        return {
          content: [{
            type: "text",
            text: `找到 ${results.length} 行：\n${JSON.stringify(results, null, 2)}`
          }]
        };
      }
    )
  ]
});

const apiGatewayServer = createSdkMcpServer({
  name: "api-gateway",
  version: "1.0.0",
  tools: [
    tool(
      "api_request",
      "向外部服务发出经过身份验证的 API 请求",
      {
        service: z.enum(["stripe", "github", "openai", "slack"]).describe("要调用的服务"),
        endpoint: z.string().describe("API 端点路径"),
        method: z.enum(["GET", "POST", "PUT", "DELETE"]).describe("HTTP 方法"),
        body: z.record(z.any()).optional().describe("请求体"),
        query: z.record(z.string()).optional().describe("查询参数")
      },
      async (args) => {
        const config = {
          stripe: { baseUrl: "https://api.stripe.com/v1", key: process.env.STRIPE_KEY },
          github: { baseUrl: "https://api.github.com", key: process.env.GITHUB_TOKEN },
          openai: { baseUrl: "https://api.openai.com/v1", key: process.env.OPENAI_KEY },
          slack: { baseUrl: "https://slack.com/api", key: process.env.SLACK_TOKEN }
        };
        
        const { baseUrl, key } = config[args.service];
        const url = new URL(`${baseUrl}${args.endpoint}`);
        
        if (args.query) {
          Object.entries(args.query).forEach(([k, v]) => url.searchParams.set(k, v));
        }
        
        const response = await fetch(url, {
          method: args.method,
          headers: { Authorization: `Bearer ${key}`, "Content-Type": "application/json" },
          body: args.body ? JSON.stringify(args.body) : undefined
        });
        
        const data = await response.json();
        return {
          content: [{
            type: "text",
            text: JSON.stringify(data, null, 2)
          }]
        };
      }
    )
  ]
});

const calculatorServer = createSdkMcpServer({
  name: "calculator",
  version: "1.0.0",
  tools: [
    tool(
      "calculate",
      "执行数学计算",
      {
        expression: z.string().describe("要计算的数学表达式"),
        precision: z.number().optional().default(2).describe("小数精度")
      },
      async (args) => {
        try {
          // 在生产环境中使用安全的数学计算库
          const result = eval(args.expression); // 仅作示例！
          const formatted = Number(result).toFixed(args.precision);
          
          return {
            content: [{
              type: "text",
              text: `${args.expression} = ${formatted}`
            }]
          };
        } catch (error) {
          return {
            content: [{
              type: "text",
              text: `错误：无效表达式 - ${error.message}`
            }]
          };
        }
      }
    ),
    tool(
      "compound_interest",
      "计算投资的复利",
      {
        principal: z.number().positive().describe("初始投资金额"),
        rate: z.number().describe("年利率（作为小数，例如 0.05 表示 5%）"),
        time: z.number().positive().describe("投资期限（年）"),
        n: z.number().positive().default(12).describe("每年复利频率")
      },
      async (args) => {
        const amount = args.principal * Math.pow(1 + args.rate / args.n, args.n * args.time);
        const interest = amount - args.principal;
        
        return {
          content: [{
            type: "text",
            text: `投资分析：\n` +
                  `本金：$${args.principal.toFixed(2)}\n` +
                  `利率：${(args.rate * 100).toFixed(2)}%\n` +
                  `时间：${args.time} 年\n` +
                  `复利：每年 ${args.n} 次\n\n` +
                  `最终金额：$${amount.toFixed(2)}\n` +
                  `赚取利息：$${interest.toFixed(2)}\n` +
                  `回报：${((interest / args.principal) * 100).toFixed(2)}%`
          }]
        };
      }
    )
  ]
});