Claude を、
あなたの製品の中へ。

for await (const msg of query({ prompt: "...", options: { stream: true } })) {
  switch (msg.type) {
    case "assistant":      // 部分テキスト・思考
      process.stdout.write(msg.delta ?? "");
      break;
    case "tool_use":       // ツール呼出が始まった
      console.log("\n[tool]", msg.name, msg.input);
      break;
    case "tool_result":    // ツール結果が返った
      break;
    case "result":         // 終了
      console.log("\n[done]", msg.result);
      break;
  }
}

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

const schema = z.object({
  todos: z.array(z.object({
    file: z.string(),
    line: z.number(),
    text: z.string(),
  })),
});

for await (const msg of query({
  prompt: "src/ の TODO を抽出して",
  options: { outputSchema: schema },
})) {
  if (msg.type === "result") {
    const parsed = schema.parse(msg.result);
    console.log(parsed.todos.length, "件");
  }
}

import { tool, createSdkMcpServer } from "@anthropic-ai/claude-agent-sdk";
import { z } from "zod";

const getWeather = tool({
  name: "get_weather",
  description: "都市名から天気を返す",
  inputSchema: z.object({ city: z.string() }),
  handler: async ({ city }) => {
    const res = await fetch(`https://wttr.in/${city}?format=j1`);
    return await res.json();
  },
});

const convertUnit = tool({
  name: "convert_unit",
  description: "1 単位変換ツール",
  inputSchema: z.object({
    value: z.number(),
    from: z.string(),
    to: z.string(),
  }),
  handler: async (i) => convert(i.value, i.from, i.to),
});

export const server = createSdkMcpServer({
  tools: [getWeather, convertUnit],
});

for await (const msg of query({
  prompt: "...",
  options: {
    permissionMode: "acceptEdits",
    canUseTool: async (tool, input) => {
      if (tool === "Bash" && input.command?.startsWith("rm")) {
        return { allow: false, reason: "rm は禁止" };
      }
      return { allow: true };
    },
    hooks: {
      PostToolUse: [
        { matcher: "Edit|Write",
          handler: async () => ({ command: "biome format --write ${FILE}" }) },
      ],
    },
    agents: [
      { name: "Reviewer",
        description: "Reads diffs and proposes review comments",
        tools: ["Read", "Glob", "Grep"] },
    ],
  },
})) { /* ... */ }

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

let total = { input: 0, output: 0, cacheCreate: 0, cacheRead: 0, usd: 0 };

for await (const msg of query({ prompt: "..." })) {
  if (msg.type === "result") {
    total.input += msg.usage.input_tokens;
    total.output += msg.usage.output_tokens;
    total.cacheCreate += msg.usage.cache_creation_input_tokens ?? 0;
    total.cacheRead += msg.usage.cache_read_input_tokens ?? 0;
    total.usd += msg.total_cost_usd;
  }
}

console.log("session cost:", total);