使用 hooks 拦截和控制代理行为

import asyncio
from claude_agent_sdk import (
    AssistantMessage,
    ClaudeSDKClient,
    ClaudeAgentOptions,
    HookMatcher,
    ResultMessage,
)


# 定义一个接收工具调用详细信息的 hook 回调
async def protect_env_files(input_data, tool_use_id, context):
    # 从工具的输入参数中提取文件路径
    file_path = input_data["tool_input"].get("file_path", "")
    file_name = file_path.split("/")[-1]

    # 如果针对 .env 文件，阻止操作
    if file_name == ".env":
        return {
            "hookSpecificOutput": {
                "hookEventName": input_data["hook_event_name"],
                "permissionDecision": "deny",
                "permissionDecisionReason": "Cannot modify .env files",
            }
        }

    # 返回空对象以允许操作
    return {}


async def main():
    options = ClaudeAgentOptions(
        hooks={
            # 为 PreToolUse 事件注册 hook
            # 匹配器仅过滤 Write 和 Edit 工具调用
            "PreToolUse": [HookMatcher(matcher="Write|Edit", hooks=[protect_env_files])]
        }
    )

    async with ClaudeSDKClient(options=options) as client:
        await client.query("Update the database configuration")
        async for message in client.receive_response():
            # 过滤助手和结果消息
            if isinstance(message, (AssistantMessage, ResultMessage)):
                print(message)


asyncio.run(main())

options = ClaudeAgentOptions(
    hooks={"PreToolUse": [HookMatcher(matcher="Bash", hooks=[my_callback])]}
)

async with ClaudeSDKClient(options=options) as client:
    await client.query("Your prompt")
    async for message in client.receive_response():
        print(message)

async def async_hook(input_data, tool_use_id, context):
    # 启动后台任务，然后立即返回
    asyncio.create_task(send_to_logging_service(input_data))
    return {"async_": True, "asyncTimeout": 30000}

async def redirect_to_sandbox(input_data, tool_use_id, context):
    if input_data["hook_event_name"] != "PreToolUse":
        return {}

    if input_data["tool_name"] == "Write":
        original_path = input_data["tool_input"].get("file_path", "")
        return {
            "hookSpecificOutput": {
                "hookEventName": input_data["hook_event_name"],
                "permissionDecision": "allow",
                "updatedInput": {
                    **input_data["tool_input"],
                    "file_path": f"/sandbox{original_path}",
                },
            }
        }
    return {}

async def block_etc_writes(input_data, tool_use_id, context):
    file_path = input_data["tool_input"].get("file_path", "")

    if file_path.startswith("/etc"):
        return {
            # 顶级字段：显示给用户的消息
            "systemMessage": "Remember: system directories like /etc are protected.",
            # hookSpecificOutput：阻止操作
            "hookSpecificOutput": {
                "hookEventName": input_data["hook_event_name"],
                "permissionDecision": "deny",
                "permissionDecisionReason": "Writing to /etc is not allowed",
            },
        }
    return {}

async def auto_approve_read_only(input_data, tool_use_id, context):
    if input_data["hook_event_name"] != "PreToolUse":
        return {}

    read_only_tools = ["Read", "Glob", "Grep"]
    if input_data["tool_name"] in read_only_tools:
        return {
            "hookSpecificOutput": {
                "hookEventName": input_data["hook_event_name"],
                "permissionDecision": "allow",
                "permissionDecisionReason": "Read-only tool auto-approved",
            }
        }
    return {}

options = ClaudeAgentOptions(
    hooks={
        "PreToolUse": [
            HookMatcher(hooks=[authorization_check]),
            HookMatcher(hooks=[input_validator]),
            HookMatcher(hooks=[audit_logger]),
        ]
    }
)

options = ClaudeAgentOptions(
    hooks={
        "PreToolUse": [
            # 匹配文件修改工具
            HookMatcher(matcher="Write|Edit|Delete", hooks=[file_security_hook]),
            # 匹配所有 MCP 工具
            HookMatcher(matcher="^mcp__", hooks=[mcp_audit_hook]),
            # 匹配所有内容（无匹配器）
            HookMatcher(hooks=[global_logger]),
        ]
    }
)

async def subagent_tracker(input_data, tool_use_id, context):
    # 子代理完成时记录子代理详细信息
    print(f"[SUBAGENT] Completed: {input_data['agent_id']}")
    print(f"  Transcript: {input_data['agent_transcript_path']}")
    print(f"  Tool use ID: {tool_use_id}")
    print(f"  Stop hook active: {input_data.get('stop_hook_active')}")
    return {}


options = ClaudeAgentOptions(
    hooks={"SubagentStop": [HookMatcher(hooks=[subagent_tracker])]}
)

import asyncio
import json
import urllib.request
from datetime import datetime


def _send_webhook(tool_name):
    """同步辅助函数，将工具使用数据 POST 到外部 webhook。"""
    data = json.dumps(
        {
            "tool": tool_name,
            "timestamp": datetime.now().isoformat(),
        }
    ).encode()
    req = urllib.request.Request(
        "https://api.example.com/webhook",
        data=data,
        headers={"Content-Type": "application/json"},
        method="POST",
    )
    urllib.request.urlopen(req)


async def webhook_notifier(input_data, tool_use_id, context):
    # 仅在工具完成后触发（PostToolUse），而不是之前
    if input_data["hook_event_name"] != "PostToolUse":
        return {}

    try:
        # 在线程中运行阻塞 HTTP 调用以避免阻塞事件循环
        await asyncio.to_thread(_send_webhook, input_data["tool_name"])
    except Exception as e:
        # 记录错误但不抛出。失败的 webhook 不应停止代理
        print(f"Webhook request failed: {e}")

    return {}

import asyncio
import json
import urllib.request

from claude_agent_sdk import ClaudeSDKClient, ClaudeAgentOptions, HookMatcher


def _send_slack_notification(message):
    """同步辅助函数，通过传入 webhook 向 Slack 发送消息。"""
    data = json.dumps({"text": f"Agent status: {message}"}).encode()
    req = urllib.request.Request(
        "https://hooks.slack.com/services/YOUR/WEBHOOK/URL",
        data=data,
        headers={"Content-Type": "application/json"},
        method="POST",
    )
    urllib.request.urlopen(req)


async def notification_handler(input_data, tool_use_id, context):
    try:
        # 在线程中运行阻塞 HTTP 调用以避免阻塞事件循环
        await asyncio.to_thread(_send_slack_notification, input_data.get("message", ""))
    except Exception as e:
        print(f"Failed to send notification: {e}")

    # 返回空对象。通知 hooks 不修改代理行为
    return {}


async def main():
    options = ClaudeAgentOptions(
        hooks={
            # 为通知事件注册 hook（不需要匹配器）
            "Notification": [HookMatcher(hooks=[notification_handler])],
        },
    )

    async with ClaudeSDKClient(options=options) as client:
        await client.query("Analyze this codebase")
        async for message in client.receive_response():
            print(message)


asyncio.run(main())

options = ClaudeAgentOptions(
    setting_sources=["project"],  # 加载 .claude/settings.json 包括 hooks
)