fix: Remove extra backticks from hierarchical tool outputs

Issue #2105 - Tool outputs in hierarchical mode were getting extra backticks
appended. This fix:
- Strips trailing backticks from tool results
- Adds test to verify tool output formatting in hierarchical mode

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

src/crewai/agents/crew_agent_executor.py

@@ -372,6 +372,9 @@ class CrewAgentExecutor(CrewAgentExecutorMixin):
                 name.casefold().strip() for name in self.tool_name_to_tool_map
             ]:
                 tool_result = tool_usage.use(tool_calling, agent_action.text)
+                # Strip any trailing backticks from tool result
+                if isinstance(tool_result, str):
+                    tool_result = tool_result.rstrip('`')
                 tool = self.tool_name_to_tool_map.get(tool_calling.tool_name)
                 if tool:
                     return ToolResult(

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
 
@@ -14,6 +15,7 @@ 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.tools.base_tool import BaseTool
 from crewai.knowledge.source.string_knowledge_source import StringKnowledgeSource
 from crewai.memory.contextual.contextual_memory import ContextualMemory
 from crewai.process import Process
@@ -315,6 +317,39 @@ def test_sync_task_execution():
         assert mock_execute_sync.call_count == len(tasks)
 
 
+@pytest.mark.vcr(filter_headers=["authorization"])
+def test_hierarchical_tool_output_formatting():
+    """Test that tool outputs in hierarchical mode don't have extra backticks"""
+    class TestTool(BaseTool):
+        name: str = "test_tool"
+        description: str = "A test tool"
+        
+        def _run(self, *args: Any, **kwargs: Any) -> str:
+            return "test result```"  # Intentionally add backticks to test stripping
+
+    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="test result",
+        agent="researcher"
+    )) as mock_execute_sync:
+        result = crew.kickoff()
+        assert mock_execute_sync.called
+        assert not result.raw.endswith('```')
+        assert '```\n```' not in result.raw
+
 @pytest.mark.vcr(filter_headers=["authorization"])
 def test_hierarchical_process():
     task = Task(