Fix result_as_answer=True bypassing conversion

- Add ToolAnswerResult wrapper class to signal when tool results should bypass conversion
- Modify agent.execute_task to return ToolAnswerResult when result_as_answer=True
- Update task._export_output to skip conversion for ToolAnswerResult instances
- Add comprehensive tests covering the fix and edge cases
- Fixes issue #3335 where tools with result_as_answer=True still triggered LLM conversion

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

src/crewai/agent.py

@@ -477,7 +477,8 @@ class Agent(BaseAgent):
         # result_as_answer set to True
         for tool_result in self.tools_results:  # type: ignore # Item "None" of "list[Any] | None" has no attribute "__iter__" (not iterable)
             if tool_result.get("result_as_answer", False):
-                result = tool_result["result"]
+                from crewai.tools.tool_types import ToolAnswerResult
+                result = ToolAnswerResult(tool_result["result"])
         crewai_event_bus.emit(
             self,
             event=AgentExecutionCompletedEvent(agent=self, task=task, output=result),

src/crewai/task.py

@@ -38,6 +38,7 @@ from crewai.security import Fingerprint, SecurityConfig
 from crewai.tasks.output_format import OutputFormat
 from crewai.tasks.task_output import TaskOutput
 from crewai.tools.base_tool import BaseTool
+from crewai.tools.tool_types import ToolAnswerResult
 from crewai.utilities.config import process_config
 from crewai.utilities.constants import NOT_SPECIFIED, _NotSpecified
 from crewai.utilities.guardrail import process_guardrail, GuardrailResult
@@ -424,11 +425,14 @@ class Task(BaseModel):
             )
 
             pydantic_output, json_output = self._export_output(result)
+            
+            raw_result = result.result if hasattr(result, 'result') else result
+            
             task_output = TaskOutput(
                 name=self.name,
                 description=self.description,
                 expected_output=self.expected_output,
-                raw=result,
+                raw=raw_result,
                 pydantic=pydantic_output,
                 json_dict=json_output,
                 agent=agent.role,
@@ -695,8 +699,11 @@ Follow these guidelines:
         return copied_task
 
     def _export_output(
-        self, result: str
+        self, result: Union[str, ToolAnswerResult]
     ) -> Tuple[Optional[BaseModel], Optional[Dict[str, Any]]]:
+        if isinstance(result, ToolAnswerResult):
+            return None, None
+            
         pydantic_output: Optional[BaseModel] = None
         json_output: Optional[Dict[str, Any]] = None
 

src/crewai/tools/tool_types.py

@@ -7,3 +7,13 @@ class ToolResult:
 
     result: str
     result_as_answer: bool = False
+
+
+class ToolAnswerResult:
+    """Wrapper for tool results that should be used as final answers without conversion."""
+    
+    def __init__(self, result: str):
+        self.result = result
+        
+    def __str__(self) -> str:
+        return self.result