fix(tools): let raise through the parallel native path, guard all handlers

Chasing down CodeRabbit's note about callers of
execute_single_native_tool_call turned up a fifth place this exception was
being downgraded: the experimental executor's parallel branch wrapped
future.result() in a broad except and folded the abort into a fake tool
result, so the remaining parallel calls carried on. The sequential path and
crew_agent_executor's parallel branch were already fine.

Five separate handlers have swallowed this during review, so added a guard
test asserting the passthrough at every site rather than trusting the next
one gets spotted.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01ETacm2dMASfpMAYUiDu5YG

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

@@ -1767,6 +1767,10 @@ class AgentExecutor(Flow[AgentExecutorState], BaseAgentExecutor):
                     idx = future_to_idx[future]
                     try:
                         ordered_results[idx] = future.result()
+                    except ToolExecutionFailedError:
+                        # A deliberate stop: folding it into a tool result would
+                        # let the remaining parallel calls carry on.
+                        raise
                     except Exception as e:
                         tool_call = runnable_tool_calls[idx]
                         info = extract_tool_call_info(tool_call)

lib/crewai/tests/tools/test_tool_failure.py

@@ -700,6 +700,32 @@ class TestRaisePolicySurvivesEveryWrapper:
         ).kickoff()
         assert not result.has_tool_failures
 
+    def test_every_broad_handler_around_tool_execution_lets_it_through(self) -> None:
+        """Guard against a new `except Exception` quietly downgrading an abort.
+
+        Five separate handlers have swallowed this exception during review of
+        this PR, so assert the passthrough at each site rather than trusting
+        that the next one will be spotted.
+        """
+        import inspect
+
+        from crewai.agent.core import Agent as AgentCls
+        from crewai.agents.crew_agent_executor import CrewAgentExecutor
+        from crewai.agents.step_executor import StepExecutor
+        from crewai.experimental.agent_executor import AgentExecutor
+
+        sites = [
+            (AgentCls._execute_with_timeout, "_passthrough_exceptions"),
+            (StepExecutor.execute, "ToolExecutionFailedError"),
+            (AgentExecutor.execute_tool_action, "ToolExecutionFailedError"),
+            (AgentExecutor.execute_native_tool, "ToolExecutionFailedError"),
+            (CrewAgentExecutor._invoke_loop_react, "ToolExecutionFailedError"),
+            (CrewAgentExecutor._ainvoke_loop_react, "ToolExecutionFailedError"),
+        ]
+        for func, expected in sites:
+            source = inspect.getsource(func)
+            assert expected in source, f"{func.__qualname__} lost its passthrough"
+
     def test_passthrough_tuple_includes_the_error(self) -> None:
         from crewai.agent.core import _passthrough_exceptions