خطافات استدعاء الأدوات

def before_hook(context: ToolCallHookContext) -> bool | None:
    # Return False to block execution
    # Return True or None to allow execution
    ...

def after_hook(context: ToolCallHookContext) -> str | None:
    # Return modified result string
    # Return None to keep original result
    ...

class ToolCallHookContext:
    tool_name: str                    # Name of the tool being called
    tool_input: dict[str, Any]        # Mutable tool input parameters
    tool: CrewStructuredTool          # Tool instance reference
    agent: Agent | BaseAgent | None   # Agent executing the tool
    task: Task | None                 # Current task
    crew: Crew | None                 # Crew instance
    tool_result: str | None           # Tool result (after hooks only)

# ✅ Correct - modify in-place
def sanitize_input(context: ToolCallHookContext) -> None:
    context.tool_input['query'] = context.tool_input['query'].lower()

# ❌ Wrong - replaces dict reference
def wrong_approach(context: ToolCallHookContext) -> None:
    context.tool_input = {'query': 'new query'}

from crewai.hooks import register_before_tool_call_hook, register_after_tool_call_hook

def log_tool_call(context):
    print(f"Tool: {context.tool_name}")
    print(f"Input: {context.tool_input}")
    return None  # Allow execution

register_before_tool_call_hook(log_tool_call)

from crewai.hooks import before_tool_call, after_tool_call

@before_tool_call
def block_dangerous_tools(context):
    dangerous_tools = ['delete_database', 'drop_table', 'rm_rf']
    if context.tool_name in dangerous_tools:
        print(f"⛔ Blocked dangerous tool: {context.tool_name}")
        return False  # Block execution
    return None

@after_tool_call
def sanitize_results(context):
    if context.tool_result and "password" in context.tool_result.lower():
        return context.tool_result.replace("password", "[REDACTED]")
    return None

@CrewBase
class MyProjCrew:
    @before_tool_call_crew
    def validate_tool_inputs(self, context):
        # Only applies to this crew
        if context.tool_name == "web_search":
            if not context.tool_input.get('query'):
                print("❌ Invalid search query")
                return False
        return None

    @after_tool_call_crew
    def log_tool_results(self, context):
        # Crew-specific tool logging
        print(f"✅ {context.tool_name} completed")
        return None

    @crew
    def crew(self) -> Crew:
        return Crew(
            agents=self.agents,
            tasks=self.tasks,
            process=Process.sequential,
            verbose=True
        )

@before_tool_call
def safety_check(context: ToolCallHookContext) -> bool | None:
    destructive_tools = [
        'delete_file',
        'drop_table',
        'remove_user',
        'system_shutdown'
    ]

    if context.tool_name in destructive_tools:
        print(f"🛑 Blocked destructive tool: {context.tool_name}")
        return False

    sensitive_tools = ['send_email', 'post_to_social_media', 'charge_payment']
    if context.tool_name in sensitive_tools:
        print(f"⚠️  Executing sensitive tool: {context.tool_name}")

    return None

@before_tool_call
def require_approval_for_actions(context: ToolCallHookContext) -> bool | None:
    approval_required = [
        'send_email',
        'make_purchase',
        'delete_file',
        'post_message'
    ]

    if context.tool_name in approval_required:
        response = context.request_human_input(
            prompt=f"Approve {context.tool_name}?",
            default_message=f"Input: {context.tool_input}\nType 'yes' to approve:"
        )

        if response.lower() != 'yes':
            print(f"❌ Tool execution denied: {context.tool_name}")
            return False

    return None

@before_tool_call
def validate_and_sanitize_inputs(context: ToolCallHookContext) -> bool | None:
    if context.tool_name == 'web_search':
        query = context.tool_input.get('query', '')
        if len(query) < 3:
            print("❌ Search query too short")
            return False
        context.tool_input['query'] = query.strip().lower()

    if context.tool_name == 'read_file':
        path = context.tool_input.get('path', '')
        if '..' in path or path.startswith('/'):
            print("❌ Invalid file path")
            return False

    return None

@after_tool_call
def sanitize_sensitive_data(context: ToolCallHookContext) -> str | None:
    if not context.tool_result:
        return None

    import re
    result = context.tool_result

    result = re.sub(
        r'(api[_-]?key|token)["\']?\s*[:=]\s*["\']?[\w-]+',
        r'\1: [REDACTED]',
        result,
        flags=re.IGNORECASE
    )

    result = re.sub(
        r'\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Z|a-z]{2,}\b',
        '[EMAIL-REDACTED]',
        result
    )

    result = re.sub(
        r'\b\d{4}[- ]?\d{4}[- ]?\d{4}[- ]?\d{4}\b',
        '[CARD-REDACTED]',
        result
    )

    return result

import time
from collections import defaultdict

tool_stats = defaultdict(lambda: {'count': 0, 'total_time': 0, 'failures': 0})

@before_tool_call
def start_timer(context: ToolCallHookContext) -> None:
    context.tool_input['_start_time'] = time.time()
    return None

@after_tool_call
def track_tool_usage(context: ToolCallHookContext) -> None:
    start_time = context.tool_input.get('_start_time', time.time())
    duration = time.time() - start_time

    tool_stats[context.tool_name]['count'] += 1
    tool_stats[context.tool_name]['total_time'] += duration

    if not context.tool_result or 'error' in context.tool_result.lower():
        tool_stats[context.tool_name]['failures'] += 1

    print(f"""
    📊 Tool Stats for {context.tool_name}:
    - Executions: {tool_stats[context.tool_name]['count']}
    - Avg Time: {tool_stats[context.tool_name]['total_time'] / tool_stats[context.tool_name]['count']:.2f}s
    - Failures: {tool_stats[context.tool_name]['failures']}
    """)

    return None

from collections import defaultdict
from datetime import datetime, timedelta

tool_call_history = defaultdict(list)

@before_tool_call
def rate_limit_tools(context: ToolCallHookContext) -> bool | None:
    tool_name = context.tool_name
    now = datetime.now()

    tool_call_history[tool_name] = [
        call_time for call_time in tool_call_history[tool_name]
        if now - call_time < timedelta(minutes=1)
    ]

    if len(tool_call_history[tool_name]) >= 10:
        print(f"🚫 Rate limit exceeded for {tool_name}")
        return False

    tool_call_history[tool_name].append(now)
    return None

import hashlib
import json

tool_cache = {}

def cache_key(tool_name: str, tool_input: dict) -> str:
    """Generate cache key from tool name and input."""
    input_str = json.dumps(tool_input, sort_keys=True)
    return hashlib.md5(f"{tool_name}:{input_str}".encode()).hexdigest()

@before_tool_call
def check_cache(context: ToolCallHookContext) -> bool | None:
    key = cache_key(context.tool_name, context.tool_input)
    if key in tool_cache:
        print(f"💾 Cache hit for {context.tool_name}")
    return None

@after_tool_call
def cache_result(context: ToolCallHookContext) -> None:
    if context.tool_result:
        key = cache_key(context.tool_name, context.tool_input)
        tool_cache[key] = context.tool_result
        print(f"💾 Cached result for {context.tool_name}")
    return None

@before_tool_call
def debug_tool_call(context: ToolCallHookContext) -> None:
    print(f"""
    🔍 Tool Call Debug:
    - Tool: {context.tool_name}
    - Agent: {context.agent.role if context.agent else 'Unknown'}
    - Task: {context.task.description[:50] if context.task else 'Unknown'}...
    - Input: {context.tool_input}
    """)
    return None

@after_tool_call
def debug_tool_result(context: ToolCallHookContext) -> None:
    if context.tool_result:
        result_preview = context.tool_result[:200]
        print(f"✅ Result Preview: {result_preview}...")
    else:
        print("⚠️  No result returned")
    return None

from crewai.hooks import (
    unregister_before_tool_call_hook,
    unregister_after_tool_call_hook
)

def my_hook(context):
    ...

register_before_tool_call_hook(my_hook)
success = unregister_before_tool_call_hook(my_hook)
print(f"Unregistered: {success}")

from crewai.hooks import (
    clear_before_tool_call_hooks,
    clear_after_tool_call_hooks,
    clear_all_tool_call_hooks
)

count = clear_before_tool_call_hooks()
print(f"Cleared {count} before hooks")

before_count, after_count = clear_all_tool_call_hooks()
print(f"Cleared {before_count} before and {after_count} after hooks")

from crewai.hooks import (
    get_before_tool_call_hooks,
    get_after_tool_call_hooks
)

before_hooks = get_before_tool_call_hooks()
after_hooks = get_after_tool_call_hooks()

print(f"Registered: {len(before_hooks)} before, {len(after_hooks)} after")

@before_tool_call
def safe_validation(context: ToolCallHookContext) -> bool | None:
    try:
        if not validate_input(context.tool_input):
            return False
    except Exception as e:
        print(f"⚠️ Hook error: {e}")
        return None  # Allow execution despite error

from crewai.hooks import ToolCallHookContext, BeforeToolCallHookType, AfterToolCallHookType

def my_before_hook(context: ToolCallHookContext) -> bool | None:
    return None

def my_after_hook(context: ToolCallHookContext) -> str | None:
    return None

register_before_tool_call_hook(my_before_hook)
register_after_tool_call_hook(my_after_hook)