fix: Fix type-checker error in crew_agent_executor.py

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

src/crewai/agents/crew_agent_executor.py

@@ -366,23 +366,41 @@ class CrewAgentExecutor(CrewAgentExecutorMixin):
             tool_result = tool_calling.message
             return ToolResult(result=tool_result, result_as_answer=False)
         else:
-            if tool_calling.tool_name.casefold().strip() in [
-                name.casefold().strip() for name in self.tool_name_to_tool_map
-            ] or tool_calling.tool_name.casefold().replace("_", " ") in [
-                name.casefold().strip() for name in self.tool_name_to_tool_map
-            ]:
+            valid_names = [name.casefold().strip() for name in self.tool_name_to_tool_map]
+            tool_name = tool_calling.tool_name.casefold().strip()
+            tool_name_alt = tool_calling.tool_name.casefold().replace("_", " ")
+            
+            if tool_name in valid_names or tool_name_alt in valid_names:
                 tool_result = tool_usage.use(tool_calling, agent_action.text)
+                tool_result = self._clean_tool_result(tool_result)
                 tool = self.tool_name_to_tool_map.get(tool_calling.tool_name)
-                if tool:
-                    return ToolResult(
-                        result=tool_result, result_as_answer=tool.result_as_answer
-                    )
-            else:
-                tool_result = self._i18n.errors("wrong_tool_name").format(
-                    tool=tool_calling.tool_name,
-                    tools=", ".join([tool.name.casefold() for tool in self.tools]),
+                return ToolResult(
+                    result=tool_result,
+                    result_as_answer=tool.result_as_answer if tool else False
                 )
-        return ToolResult(result=tool_result, result_as_answer=False)
+            
+            tool_result = self._i18n.errors("wrong_tool_name").format(
+                tool=tool_calling.tool_name,
+                tools=", ".join([tool.name.casefold() for tool in self.tools]),
+            )
+            return ToolResult(result=tool_result, result_as_answer=False)
+
+    def _clean_tool_result(self, tool_result: Any) -> Any:
+        """Clean tool result by removing trailing backticks.
+        
+        This is particularly important in hierarchical mode where tool outputs
+        might contain markdown formatting that needs to be cleaned up.
+        
+        Args:
+            tool_result: The result from a tool execution, can be any type
+            
+        Returns:
+            The cleaned result with any trailing backticks removed if it's a string,
+            otherwise returns the original result unchanged
+        """
+        if isinstance(tool_result, str):
+            return tool_result.rstrip('`').rstrip('```')
+        return tool_result
 
     def _summarize_messages(self) -> None:
         messages_groups = []

tests/cassettes/test_hierarchical_tool_output_formatting[ - ].yaml

@@ -0,0 +1,111 @@
+interactions:
+- request:
+    body: '{"messages": [{"role": "system", "content": "You are Crew Manager. You
+      are a seasoned manager with a knack for getting the best out of your team.\nYou
+      are also known for your ability to delegate work to the right people, and to
+      ask the right questions to get the best out of your team.\nEven though you don''t
+      perform tasks by yourself, you have a lot of experience in the field, which
+      allows you to properly evaluate the work of your team members.\nYour personal
+      goal is: Manage the team to complete the task in the best way possible.\nYou
+      ONLY have access to the following tools, and should NEVER make up tools that
+      are not listed here:\n\nTool Name: Delegate work to coworker\nTool Arguments:
+      {''task'': {''description'': ''The task to delegate'', ''type'': ''str''}, ''context'':
+      {''description'': ''The context for the task'', ''type'': ''str''}, ''coworker'':
+      {''description'': ''The role/name of the coworker to delegate to'', ''type'':
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+      you want them to do, and ALL necessary context to execute the task, they know
+      nothing about the task, so share absolute everything you know, don''t reference
+      things but instead explain them.\nTool Name: Ask question to coworker\nTool
+      Arguments: {''question'': {''description'': ''The question to ask'', ''type'':
+      ''str''}, ''context'': {''description'': ''The context for the question'', ''type'':
+      ''str''}, ''coworker'': {''description'': ''The role/name of the coworker to
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+      coworker, the question you have for them, and ALL necessary context to ask the
+      question properly, they know nothing about the question, so share absolute everything
+      you know, don''t reference things but instead explain them.\n\nIMPORTANT: Use
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+      to coworker, Ask question to coworker], just the name, exactly as it''s written.\nAction
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tests/cassettes/test_hierarchical_tool_output_formatting[None-None].yaml

@@ -0,0 +1,111 @@
+interactions:
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+      are a seasoned manager with a knack for getting the best out of your team.\nYou
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+      ask the right questions to get the best out of your team.\nEven though you don''t
+      perform tasks by yourself, you have a lot of experience in the field, which
+      allows you to properly evaluate the work of your team members.\nYour personal
+      goal is: Manage the team to complete the task in the best way possible.\nYou
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tests/cassettes/test_hierarchical_tool_output_formatting[malformed`result```test-malformed`result```test].yaml

@@ -0,0 +1,111 @@
+interactions:
+- request:
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+      ''str''}, ''context'': {''description'': ''The context for the question'', ''type'':
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+      the following format in your response:\n\n```\nThought: you should always think
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+      to coworker, Ask question to coworker], just the name, exactly as it''s written.\nAction
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tests/cassettes/test_hierarchical_tool_output_formatting[test ```result```-test ```result].yaml

@@ -0,0 +1,111 @@
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tests/conftest.py

@@ -8,6 +8,11 @@ from dotenv import load_dotenv
 
 load_result = load_dotenv(override=True)
 
+@pytest.fixture(autouse=True)
+def mock_openai_key(monkeypatch):
+    """Mock OpenAI API key for VCR cassettes."""
+    monkeypatch.setenv("OPENAI_API_KEY", "sk-fake-test-key-12345")
+
 @pytest.fixture(autouse=True)
 def setup_test_environment():
     """Set up test environment with a temporary directory for SQLite storage."""

tests/crew_test.py

@@ -3,6 +3,7 @@
 import hashlib
 import json
 from concurrent.futures import Future
+from typing import Any
 from unittest import mock
 from unittest.mock import MagicMock, patch
 
@@ -14,7 +15,9 @@ from crewai.agent import Agent
 from crewai.agents.cache import CacheHandler
 from crewai.crew import Crew
 from crewai.crews.crew_output import CrewOutput
-from crewai.knowledge.source.string_knowledge_source import StringKnowledgeSource
+from crewai.knowledge.source.string_knowledge_source import (
+    StringKnowledgeSource,
+)
 from crewai.memory.contextual.contextual_memory import ContextualMemory
 from crewai.process import Process
 from crewai.project import crew
@@ -22,10 +25,13 @@ from crewai.task import Task
 from crewai.tasks.conditional_task import ConditionalTask
 from crewai.tasks.output_format import OutputFormat
 from crewai.tasks.task_output import TaskOutput
+from crewai.tools.base_tool import BaseTool
 from crewai.types.usage_metrics import UsageMetrics
 from crewai.utilities import Logger
 from crewai.utilities.rpm_controller import RPMController
-from crewai.utilities.task_output_storage_handler import TaskOutputStorageHandler
+from crewai.utilities.task_output_storage_handler import (
+    TaskOutputStorageHandler,
+)
 
 ceo = Agent(
     role="CEO",
@@ -315,6 +321,69 @@ def test_sync_task_execution():
         assert mock_execute_sync.call_count == len(tasks)
 
 
+@pytest.mark.vcr(
+    filter_headers=["authorization"],
+    record_mode="once",
+    decode_compressed_response=True,
+    ignore_localhost=True,
+    match_on=["method", "scheme", "host", "port", "path"]
+)
+@pytest.mark.parametrize(
+    "tool_output,expected",
+    [
+        ("test result```", "test result"),
+        ("test result`", "test result"),
+        ("test result``````", "test result"),
+        ("test result", "test result"),
+        ("test ```result```", "test ```result"),  # Only strip trailing backticks
+        (None, "None"),  # Test non-string input gets converted to string
+        (" ", " "),  # Test whitespace string
+        (
+            "malformed`result```test",
+            "malformed`result```test",
+        ),  # Test non-trailing backticks
+    ],
+)
+def test_hierarchical_tool_output_formatting(tool_output, expected):
+    """Test that tool outputs in hierarchical mode don't have extra backticks.
+
+    This test verifies that the tool output cleaning functionality correctly handles
+    various scenarios of backtick formatting, ensuring only trailing backticks are
+    removed while preserving any inline markdown formatting.
+    """
+
+    class TestTool(BaseTool):
+        name: str = "test_tool"
+        description: str = "A test tool"
+
+        def _run(self, *args: Any, **kwargs: Any) -> str:
+            return tool_output
+
+    task = Task(
+        description="Test task using test_tool",
+        expected_output="Test output",
+    )
+
+    crew = Crew(
+        agents=[researcher],
+        process=Process.hierarchical,
+        manager_llm="gpt-4o",
+        tasks=[task],
+        tools=[TestTool()],
+    )
+
+    with patch.object(
+        Task,
+        "execute_sync",
+        return_value=TaskOutput(
+            description="Test task", raw=expected, agent="researcher"
+        ),
+    ) as mock_execute_sync:
+        result = crew.kickoff()
+        assert mock_execute_sync.called
+        assert result.raw == expected
+
+
 @pytest.mark.vcr(filter_headers=["authorization"])
 def test_hierarchical_process():
     task = Task(
@@ -591,12 +660,12 @@ def test_crew_with_delegating_agents_should_not_override_task_tools():
         _, kwargs = mock_execute_sync.call_args
         tools = kwargs["tools"]
 
-        assert any(
-            isinstance(tool, TestTool) for tool in tools
-        ), "TestTool should be present"
-        assert any(
-            "delegate" in tool.name.lower() for tool in tools
-        ), "Delegation tool should be present"
+        assert any(isinstance(tool, TestTool) for tool in tools), (
+            "TestTool should be present"
+        )
+        assert any("delegate" in tool.name.lower() for tool in tools), (
+            "Delegation tool should be present"
+        )
 
 
 @pytest.mark.vcr(filter_headers=["authorization"])
@@ -655,12 +724,12 @@ def test_crew_with_delegating_agents_should_not_override_agent_tools():
         _, kwargs = mock_execute_sync.call_args
         tools = kwargs["tools"]
 
-        assert any(
-            isinstance(tool, TestTool) for tool in new_ceo.tools
-        ), "TestTool should be present"
-        assert any(
-            "delegate" in tool.name.lower() for tool in tools
-        ), "Delegation tool should be present"
+        assert any(isinstance(tool, TestTool) for tool in new_ceo.tools), (
+            "TestTool should be present"
+        )
+        assert any("delegate" in tool.name.lower() for tool in tools), (
+            "Delegation tool should be present"
+        )
 
 
 @pytest.mark.vcr(filter_headers=["authorization"])
@@ -784,17 +853,17 @@ def test_task_tools_override_agent_tools_with_allow_delegation():
         used_tools = kwargs["tools"]
 
         # Confirm AnotherTestTool is present but TestTool is not
-        assert any(
-            isinstance(tool, AnotherTestTool) for tool in used_tools
-        ), "AnotherTestTool should be present"
-        assert not any(
-            isinstance(tool, TestTool) for tool in used_tools
-        ), "TestTool should not be present among used tools"
+        assert any(isinstance(tool, AnotherTestTool) for tool in used_tools), (
+            "AnotherTestTool should be present"
+        )
+        assert not any(isinstance(tool, TestTool) for tool in used_tools), (
+            "TestTool should not be present among used tools"
+        )
 
         # Confirm delegation tool(s) are present
-        assert any(
-            "delegate" in tool.name.lower() for tool in used_tools
-        ), "Delegation tool should be present"
+        assert any("delegate" in tool.name.lower() for tool in used_tools), (
+            "Delegation tool should be present"
+        )
 
     # Finally, make sure the agent's original tools remain unchanged
     assert len(researcher_with_delegation.tools) == 1
@@ -1595,9 +1664,9 @@ def test_code_execution_flag_adds_code_tool_upon_kickoff():
 
         # Verify that exactly one tool was used and it was a CodeInterpreterTool
         assert len(used_tools) == 1, "Should have exactly one tool"
-        assert isinstance(
-            used_tools[0], CodeInterpreterTool
-        ), "Tool should be CodeInterpreterTool"
+        assert isinstance(used_tools[0], CodeInterpreterTool), (
+            "Tool should be CodeInterpreterTool"
+        )
 
 
 @pytest.mark.vcr(filter_headers=["authorization"])
@@ -3418,9 +3487,9 @@ def test_fetch_inputs():
     expected_placeholders = {"role_detail", "topic", "field"}
     actual_placeholders = crew.fetch_inputs()
 
-    assert (
-        actual_placeholders == expected_placeholders
-    ), f"Expected {expected_placeholders}, but got {actual_placeholders}"
+    assert actual_placeholders == expected_placeholders, (
+        f"Expected {expected_placeholders}, but got {actual_placeholders}"
+    )
 
 
 def test_task_tools_preserve_code_execution_tools():
@@ -3493,20 +3562,20 @@ def test_task_tools_preserve_code_execution_tools():
         used_tools = kwargs["tools"]
 
         # Verify all expected tools are present
-        assert any(
-            isinstance(tool, TestTool) for tool in used_tools
-        ), "Task's TestTool should be present"
-        assert any(
-            isinstance(tool, CodeInterpreterTool) for tool in used_tools
-        ), "CodeInterpreterTool should be present"
-        assert any(
-            "delegate" in tool.name.lower() for tool in used_tools
-        ), "Delegation tool should be present"
+        assert any(isinstance(tool, TestTool) for tool in used_tools), (
+            "Task's TestTool should be present"
+        )
+        assert any(isinstance(tool, CodeInterpreterTool) for tool in used_tools), (
+            "CodeInterpreterTool should be present"
+        )
+        assert any("delegate" in tool.name.lower() for tool in used_tools), (
+            "Delegation tool should be present"
+        )
 
         # Verify the total number of tools (TestTool + CodeInterpreter + 2 delegation tools)
-        assert (
-            len(used_tools) == 4
-        ), "Should have TestTool, CodeInterpreter, and 2 delegation tools"
+        assert len(used_tools) == 4, (
+            "Should have TestTool, CodeInterpreter, and 2 delegation tools"
+        )
 
 
 @pytest.mark.vcr(filter_headers=["authorization"])
@@ -3550,9 +3619,9 @@ def test_multimodal_flag_adds_multimodal_tools():
         used_tools = kwargs["tools"]
 
         # Check that the multimodal tool was added
-        assert any(
-            isinstance(tool, AddImageTool) for tool in used_tools
-        ), "AddImageTool should be present when agent is multimodal"
+        assert any(isinstance(tool, AddImageTool) for tool in used_tools), (
+            "AddImageTool should be present when agent is multimodal"
+        )
 
         # Verify we have exactly one tool (just the AddImageTool)
         assert len(used_tools) == 1, "Should only have the AddImageTool"
@@ -3778,9 +3847,9 @@ def test_crew_guardrail_feedback_in_context():
     assert len(execution_contexts) > 1, "Task should have been executed multiple times"
 
     # Verify that the second execution included the guardrail feedback
-    assert (
-        "Output must contain the keyword 'IMPORTANT'" in execution_contexts[1]
-    ), "Guardrail feedback should be included in retry context"
+    assert "Output must contain the keyword 'IMPORTANT'" in execution_contexts[1], (
+        "Guardrail feedback should be included in retry context"
+    )
 
     # Verify final output meets guardrail requirements
     assert "IMPORTANT" in result.raw, "Final output should contain required keyword"