Claude Code: Agent SDK

import { Agent } from "@anthropic-ai/claude-code-sdk";

const agent = new Agent({
  apiKey: process.env.ANTHROPIC_API_KEY,
  model: "claude-sonnet-4-20250514",
  workingDir: "./my-project",
});

const result = await agent.run("Add user login with JWT authentication");

console.log(result.summary);
console.log(`Files modified: ${result.files.length}`);
console.log(`Tests passed: ${result.testsPassed}`);

const agent = new Agent({
  apiKey: "sk-ant-api03-xxxxx",
  model: "claude-sonnet-4-20250514",
  workingDir: "/path/to/project",
  tools: ["Read", "Write", "Bash"],
  maxTurns: 30,
  style: "concise",
});

// 基本実行
const result = await agent.run("Fix all TypeScript errors");

// ストリーミング実行
const stream = agent.runStream("Refactor auth module");
for await (const event of stream) {
  console.log(event.type, event.data);
}

// コンテキスト付き実行
const result = await agent.run("Modify this function", {
  files: ["src/auth/jwt.ts"],
  context: "Use RS256 instead of HS256",
});

interface AgentResult {
  summary: string;
  files: FileChange[];
  commands: CommandResult[];
  testsPassed: number;
  testsFailed: number;
  tokensUsed: number;
  cost: number;
}

async function reviewAndFix(projectDir: string) {
  const agent = new Agent({
    apiKey: process.env.ANTHROPIC_API_KEY!,
    workingDir: projectDir,
    tools: ["Read", "Write", "Bash"],
  });

  // Step 1: コードレビュー
  const review = await agent.run(
    "Review project code quality, list all issues to fix"
  );

  // Step 2: 自動修正
  if (review.summary.includes("issue")) {
    const fix = await agent.run("Fix all listed quality issues, run tests");
    console.log(`Tests: ${fix.testsPassed} passed, ${fix.testsFailed} failed`);
  }
}

const databaseQueryTool: Tool = {
  name: "database_query",
  description: "Execute a read-only SQL query",
  parameters: {
    sql: { type: "string", description: "SQL query (SELECT only)" },
  },
  execute: async ({ sql }) => {
    if (!sql.trim().toUpperCase().startsWith("SELECT")) {
      throw new Error("Only SELECT queries allowed");
    }
    const result = await db.query(sql);
    return { rows: result.rows, count: result.rowCount };
  },
};

const agent = new Agent({
  apiKey: process.env.ANTHROPIC_API_KEY!,
  tools: ["Read", "Write", databaseQueryTool],
});

agent.on("file:write", (data) => {
  console.log(`Modified: ${data.filePath}`);
  auditLog.record(data);
});

agent.on("bash:execute", (data) => {
  if (data.command.includes("DROP")) {
    throw new Error("Dangerous command blocked");
  }
});

class CodeReviewBot {
  private agent: Agent;

  constructor(apiKey: string) {
    this.agent = new Agent({
      apiKey,
      model: "claude-sonnet-4-20250514",
      tools: ["Read", "Bash"],
    });
  }

  async reviewPR(repoDir: string, prDiff: string) {
    this.agent.setWorkingDir(repoDir);
    const result = await this.agent.run(
      `Review PR changes:\n${prDiff}\n\nCheck security, performance, style, test coverage`
    );
    return { review: result.summary, score: this.calculateScore(result.summary) };
  }

  private calculateScore(text: string): number {
    let score = 100;
    if (text.includes("critical")) score -= 30;
    if (text.includes("warning")) score -= 10;
    return Math.max(0, score);
  }
}