feat: implement before and after tool call hooks in CrewAgentExecutor and AgentExecutor

- Added support for before and after tool call hooks in both CrewAgentExecutor and AgentExecutor classes.
- Introduced ToolCallHookContext to manage context for hooks, allowing for enhanced control over tool execution.
- Implemented logic to block tool execution based on before hooks and to modify results based on after hooks.
- Added integration tests to validate the functionality of the new hooks, ensuring they work as expected in various scenarios.
- Enhanced the overall flexibility and extensibility of tool interactions within the CrewAI framework.

lib/crewai/src/crewai/agents/crew_agent_executor.py

@@ -28,6 +28,11 @@ from crewai.hooks.llm_hooks import (
     get_after_llm_call_hooks,
     get_before_llm_call_hooks,
 )
+from crewai.hooks.tool_hooks import (
+    ToolCallHookContext,
+    get_after_tool_call_hooks,
+    get_before_tool_call_hooks,
+)
 from crewai.utilities.agent_utils import (
     aget_llm_response,
     convert_tools_to_openai_schema,
@@ -749,8 +754,41 @@ class CrewAgentExecutor(CrewAgentExecutorMixin):
 
         track_delegation_if_needed(func_name, args_dict, self.task)
 
-        # Execute the tool (only if not cached and not at max usage)
-        if not from_cache and not max_usage_reached:
+        # Find the structured tool for hook context
+        structured_tool = None
+        for tool in self.tools or []:
+            if sanitize_tool_name(tool.name) == func_name:
+                structured_tool = tool
+                break
+
+        # Execute before_tool_call hooks
+        hook_blocked = False
+        before_hook_context = ToolCallHookContext(
+            tool_name=func_name,
+            tool_input=args_dict,
+            tool=structured_tool,  # type: ignore[arg-type]
+            agent=self.agent,
+            task=self.task,
+            crew=self.crew,
+        )
+        before_hooks = get_before_tool_call_hooks()
+        try:
+            for hook in before_hooks:
+                hook_result = hook(before_hook_context)
+                if hook_result is False:
+                    hook_blocked = True
+                    break
+        except Exception as hook_error:
+            self._printer.print(
+                content=f"Error in before_tool_call hook: {hook_error}",
+                color="red",
+            )
+
+        # If hook blocked execution, set result and skip tool execution
+        if hook_blocked:
+            result = f"Tool execution blocked by hook. Tool: {func_name}"
+        # Execute the tool (only if not cached, not at max usage, and not blocked by hook)
+        elif not from_cache and not max_usage_reached:
             result = "Tool not found"
             if func_name in available_functions:
                 try:
@@ -798,6 +836,28 @@ class CrewAgentExecutor(CrewAgentExecutorMixin):
             # Return error message when max usage limit is reached
             result = f"Tool '{func_name}' has reached its usage limit of {original_tool.max_usage_count} times and cannot be used anymore."
 
+        after_hook_context = ToolCallHookContext(
+            tool_name=func_name,
+            tool_input=args_dict,
+            tool=structured_tool,  # type: ignore[arg-type]
+            agent=self.agent,
+            task=self.task,
+            crew=self.crew,
+            tool_result=result,
+        )
+        after_hooks = get_after_tool_call_hooks()
+        try:
+            for after_hook in after_hooks:
+                hook_result = after_hook(after_hook_context)
+                if hook_result is not None:
+                    result = hook_result
+                    after_hook_context.tool_result = result
+        except Exception as hook_error:
+            self._printer.print(
+                content=f"Error in after_tool_call hook: {hook_error}",
+                color="red",
+            )
+
         # Emit tool usage finished event
         crewai_event_bus.emit(
             self,

lib/crewai/src/crewai/experimental/agent_executor.py

@@ -36,6 +36,11 @@ from crewai.hooks.llm_hooks import (
     get_after_llm_call_hooks,
     get_before_llm_call_hooks,
 )
+from crewai.hooks.tool_hooks import (
+    ToolCallHookContext,
+    get_after_tool_call_hooks,
+    get_before_tool_call_hooks,
+)
 from crewai.utilities.agent_utils import (
     convert_tools_to_openai_schema,
     enforce_rpm_limit,
@@ -650,8 +655,37 @@ class AgentExecutor(Flow[AgentReActState], CrewAgentExecutorMixin):
 
             track_delegation_if_needed(func_name, args_dict, self.task)
 
-            # Execute the tool (only if not cached and not at max usage)
-            if not from_cache and not max_usage_reached:
+            structured_tool = None
+            for tool in self.tools or []:
+                if sanitize_tool_name(tool.name) == func_name:
+                    structured_tool = tool
+                    break
+
+            hook_blocked = False
+            before_hook_context = ToolCallHookContext(
+                tool_name=func_name,
+                tool_input=args_dict,
+                tool=structured_tool,  # type: ignore[arg-type]
+                agent=self.agent,
+                task=self.task,
+                crew=self.crew,
+            )
+            before_hooks = get_before_tool_call_hooks()
+            try:
+                for hook in before_hooks:
+                    hook_result = hook(before_hook_context)
+                    if hook_result is False:
+                        hook_blocked = True
+                        break
+            except Exception as hook_error:
+                self._printer.print(
+                    content=f"Error in before_tool_call hook: {hook_error}",
+                    color="red",
+                )
+
+            if hook_blocked:
+                result = f"Tool execution blocked by hook. Tool: {func_name}"
+            elif not from_cache and not max_usage_reached:
                 result = "Tool not found"
                 if func_name in self._available_functions:
                     try:
@@ -700,6 +734,29 @@ class AgentExecutor(Flow[AgentReActState], CrewAgentExecutorMixin):
                 # Return error message when max usage limit is reached
                 result = f"Tool '{func_name}' has reached its usage limit of {original_tool.max_usage_count} times and cannot be used anymore."
 
+            # Execute after_tool_call hooks (even if blocked, to allow logging/monitoring)
+            after_hook_context = ToolCallHookContext(
+                tool_name=func_name,
+                tool_input=args_dict,
+                tool=structured_tool,  # type: ignore[arg-type]
+                agent=self.agent,
+                task=self.task,
+                crew=self.crew,
+                tool_result=result,
+            )
+            after_hooks = get_after_tool_call_hooks()
+            try:
+                for after_hook in after_hooks:
+                    hook_result = after_hook(after_hook_context)
+                    if hook_result is not None:
+                        result = hook_result
+                        after_hook_context.tool_result = result
+            except Exception as hook_error:
+                self._printer.print(
+                    content=f"Error in after_tool_call hook: {hook_error}",
+                    color="red",
+                )
+
             # Emit tool usage finished event
             crewai_event_bus.emit(
                 self,

lib/crewai/tests/cassettes/hooks/TestNativeToolCallingHooksIntegration.test_agent_native_tool_hooks_before_and_after.yaml

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lib/crewai/tests/cassettes/hooks/TestNativeToolCallingHooksIntegration.test_before_hook_blocks_tool_execution_in_crew.yaml

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@@ -590,3 +590,163 @@ class TestToolHooksIntegration:
             # Clean up hooks
             unregister_before_tool_call_hook(before_tool_call_hook)
             unregister_after_tool_call_hook(after_tool_call_hook)
+
+
+class TestNativeToolCallingHooksIntegration:
+    """Integration tests for hooks with native function calling (Agent and Crew)."""
+
+    @pytest.mark.vcr()
+    def test_agent_native_tool_hooks_before_and_after(self):
+        """Test that Agent with native tool calling executes before/after hooks."""
+        import os
+        from crewai import Agent
+        from crewai.tools import tool
+
+        if not os.environ.get("OPENAI_API_KEY"):
+            pytest.skip("OPENAI_API_KEY not set")
+
+        hook_calls = {"before": [], "after": []}
+
+        @tool("multiply_numbers")
+        def multiply_numbers(a: int, b: int) -> int:
+            """Multiply two numbers together."""
+            return a * b
+
+        def before_hook(context: ToolCallHookContext) -> bool | None:
+            hook_calls["before"].append({
+                "tool_name": context.tool_name,
+                "tool_input": dict(context.tool_input),
+                "has_agent": context.agent is not None,
+            })
+            return None
+
+        def after_hook(context: ToolCallHookContext) -> str | None:
+            hook_calls["after"].append({
+                "tool_name": context.tool_name,
+                "tool_result": context.tool_result,
+                "has_agent": context.agent is not None,
+            })
+            return None
+
+        register_before_tool_call_hook(before_hook)
+        register_after_tool_call_hook(after_hook)
+
+        try:
+            agent = Agent(
+                role="Calculator",
+                goal="Perform calculations",
+                backstory="You are a calculator assistant",
+                tools=[multiply_numbers],
+                verbose=True,
+            )
+
+            result = agent.kickoff(
+                messages="What is 7 times 6? Use the multiply_numbers tool."
+            )
+
+            # Verify before hook was called
+            assert len(hook_calls["before"]) > 0, "Before hook was never called"
+            before_call = hook_calls["before"][0]
+            assert before_call["tool_name"] == "multiply_numbers"
+            assert "a" in before_call["tool_input"]
+            assert "b" in before_call["tool_input"]
+            assert before_call["has_agent"] is True
+
+            # Verify after hook was called
+            assert len(hook_calls["after"]) > 0, "After hook was never called"
+            after_call = hook_calls["after"][0]
+            assert after_call["tool_name"] == "multiply_numbers"
+            assert "42" in str(after_call["tool_result"])
+            assert after_call["has_agent"] is True
+
+        finally:
+            unregister_before_tool_call_hook(before_hook)
+            unregister_after_tool_call_hook(after_hook)
+
+    @pytest.mark.vcr()
+    def test_crew_native_tool_hooks_before_and_after(self):
+        """Test that Crew with Agent executes before/after hooks with full context."""
+        import os
+        from crewai import Agent, Crew, Task
+        from crewai.tools import tool
+
+        if not os.environ.get("OPENAI_API_KEY"):
+            pytest.skip("OPENAI_API_KEY not set")
+
+        hook_calls = {"before": [], "after": []}
+
+        @tool("divide_numbers")
+        def divide_numbers(a: int, b: int) -> float:
+            """Divide first number by second number."""
+            return a / b
+
+        def before_hook(context: ToolCallHookContext) -> bool | None:
+            hook_calls["before"].append({
+                "tool_name": context.tool_name,
+                "tool_input": dict(context.tool_input),
+                "has_agent": context.agent is not None,
+                "has_task": context.task is not None,
+                "has_crew": context.crew is not None,
+                "agent_role": context.agent.role if context.agent else None,
+            })
+            return None
+
+        def after_hook(context: ToolCallHookContext) -> str | None:
+            hook_calls["after"].append({
+                "tool_name": context.tool_name,
+                "tool_result": context.tool_result,
+                "has_agent": context.agent is not None,
+                "has_task": context.task is not None,
+                "has_crew": context.crew is not None,
+            })
+            return None
+
+        register_before_tool_call_hook(before_hook)
+        register_after_tool_call_hook(after_hook)
+
+        try:
+            agent = Agent(
+                role="Math Assistant",
+                goal="Perform division calculations accurately",
+                backstory="You are a math assistant that helps with division",
+                tools=[divide_numbers],
+                verbose=True,
+            )
+
+            task = Task(
+                description="Calculate 100 divided by 4 using the divide_numbers tool.",
+                expected_output="The result of the division",
+                agent=agent,
+            )
+
+            crew = Crew(
+                agents=[agent],
+                tasks=[task],
+                verbose=True,
+            )
+
+            result = crew.kickoff()
+
+            # Verify before hook was called with full context
+            assert len(hook_calls["before"]) > 0, "Before hook was never called"
+            before_call = hook_calls["before"][0]
+            assert before_call["tool_name"] == "divide_numbers"
+            assert "a" in before_call["tool_input"]
+            assert "b" in before_call["tool_input"]
+            assert before_call["has_agent"] is True
+            assert before_call["has_task"] is True
+            assert before_call["has_crew"] is True
+            assert before_call["agent_role"] == "Math Assistant"
+
+            # Verify after hook was called with full context
+            assert len(hook_calls["after"]) > 0, "After hook was never called"
+            after_call = hook_calls["after"][0]
+            assert after_call["tool_name"] == "divide_numbers"
+            assert "25" in str(after_call["tool_result"])
+            assert after_call["has_agent"] is True
+            assert after_call["has_task"] is True
+            assert after_call["has_crew"] is True
+
+        finally:
+            unregister_before_tool_call_hook(before_hook)
+            unregister_after_tool_call_hook(after_hook)