Fix issue #2664: Custom tools not being called by the agent

Co-Authored-By: Joe Moura <joao@crewai.com>

src/crewai/tools/tool_usage.py

@@ -75,6 +75,7 @@ class ToolUsage:
         agent: Optional[Union["BaseAgent", "LiteAgent"]] = None,
         action: Any = None,
         fingerprint_context: Optional[Dict[str, str]] = None,
+        original_tools: List[Any] = [],
     ) -> None:
         self._i18n: I18N = agent.i18n if agent else I18N()
         self._printer: Printer = Printer()
@@ -86,6 +87,7 @@ class ToolUsage:
         self.tools_description = render_text_description_and_args(tools)
         self.tools_names = get_tool_names(tools)
         self.tools_handler = tools_handler
+        self.original_tools = original_tools
         self.tools = tools
         self.task = task
         self.action = action
@@ -191,13 +193,16 @@ class ToolUsage:
             )  # type: ignore
             from_cache = result is not None
 
+        original_tool = None
+        if hasattr(self, 'original_tools') and self.original_tools:
+            original_tool = next(
+                (ot for ot in self.original_tools if ot.name == tool.name),
+                None
+            )
+        
         available_tool = next(
-            (
-                available_tool
-                for available_tool in self.tools
-                if available_tool.name == tool.name
-            ),
-            None,
+            (at for at in self.tools if at.name == tool.name),
+            None
         )
 
         if result is None:
@@ -259,10 +264,11 @@ class ToolUsage:
 
             if self.tools_handler:
                 should_cache = True
-                if (
-                    hasattr(available_tool, "cache_function")
-                    and available_tool.cache_function  # type: ignore # Item "None" of "Any | None" has no attribute "cache_function"
-                ):
+                if original_tool and hasattr(original_tool, "cache_function") and original_tool.cache_function:
+                    should_cache = original_tool.cache_function(
+                        calling.arguments, result
+                    )
+                elif available_tool and hasattr(available_tool, "cache_function") and available_tool.cache_function:
                     should_cache = available_tool.cache_function(  # type: ignore # Item "None" of "Any | None" has no attribute "cache_function"
                         calling.arguments, result
                     )
@@ -290,10 +296,9 @@ class ToolUsage:
             result=result,
         )
 
-        if (
-            hasattr(available_tool, "result_as_answer")
-            and available_tool.result_as_answer  # type: ignore # Item "None" of "Any | None" has no attribute "cache_function"
-        ):
+        if original_tool and hasattr(original_tool, "result_as_answer") and original_tool.result_as_answer:
+            result_as_answer = original_tool.result_as_answer
+        elif available_tool and hasattr(available_tool, "result_as_answer") and available_tool.result_as_answer:
             result_as_answer = available_tool.result_as_answer  # type: ignore # Item "None" of "Any | None" has no attribute "result_as_answer"
             data["result_as_answer"] = result_as_answer  # type: ignore
 

tests/tools/test_custom_tool_invocation.py

@@ -0,0 +1,60 @@
+import pytest
+from unittest.mock import MagicMock
+
+from crewai import Agent, Task
+from crewai.agents.crew_agent_executor import CrewAgentExecutor
+from crewai.tools import BaseTool
+from crewai.agents.tools_handler import ToolsHandler
+from crewai.agents.parser import AgentAction
+from pydantic import BaseModel, Field
+
+
+class TestToolInput(BaseModel):
+    test_param: str = Field(..., description="A test parameter")
+
+
+class TestCustomTool(BaseTool):
+    name: str = "Test Custom Tool"
+    description: str = "A test tool to verify custom tool invocation"
+    args_schema: type[BaseModel] = TestToolInput
+
+    def _run(self, test_param: str) -> str:
+        return f"Tool executed with param: {test_param}"
+
+
+def test_custom_tool_invocation():
+    custom_tool = TestCustomTool()
+    
+    mock_agent = MagicMock()
+    mock_task = MagicMock()
+    mock_llm = MagicMock()
+    mock_crew = MagicMock()
+    tools_handler = ToolsHandler()
+    
+    executor = CrewAgentExecutor(
+        llm=mock_llm,
+        task=mock_task,
+        crew=mock_crew,
+        agent=mock_agent,
+        prompt={},
+        max_iter=5,
+        tools=[custom_tool],
+        tools_names="Test Custom Tool",
+        stop_words=[],
+        tools_description="A test tool to verify custom tool invocation",
+        tools_handler=tools_handler,
+        original_tools=[custom_tool]
+    )
+    
+    action = AgentAction(
+        tool="Test Custom Tool",
+        tool_input={"test_param": "test_value"},
+        thought="I'll use the custom tool",
+        text="I'll use the Test Custom Tool to get a result",
+        message_log=[]
+    )
+    
+    result = executor._execute_tool_and_check_finality(action)
+    
+    assert "Tool executed with param: test_value" in result.result
+    assert result.result_as_answer is False