fix: store FileArtifact returned by after_tool_call hooks

store_if_artifact ran before the after_tool_call hooks, so a hook that
replaced the result with a FileArtifact put raw bytes / a dataclass repr
into the tool message and events. Re-run store_if_artifact on the final
result after the hook loop in all three native tool paths (no-op for the
normal string case).

lib/crewai/src/crewai/agents/crew_agent_executor.py

@@ -1030,6 +1030,10 @@ class CrewAgentExecutor(BaseAgentExecutor):
                     color="red",
                 )
 
+        # An after_tool_call hook may have replaced the result with a
+        # FileArtifact; keep those bytes out of the message and events too.
+        result = store_if_artifact(result, scope_id)
+
         if not error_event_emitted:
             crewai_event_bus.emit(
                 self,

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

@@ -1939,6 +1939,10 @@ class AgentExecutor(Flow[AgentExecutorState], BaseAgentExecutor):
                     color="red",
                 )
 
+        # An after_tool_call hook may have replaced the result with a
+        # FileArtifact; keep those bytes out of the message and events too.
+        result = store_if_artifact(result, scope_id)
+
         if not error_event_emitted:
             crewai_event_bus.emit(
                 self,

lib/crewai/src/crewai/utilities/agent_utils.py

@@ -1541,6 +1541,10 @@ def execute_single_native_tool_call(
     except Exception:  # noqa: S110
         pass
 
+    # An after_tool_call hook may have replaced the result with a FileArtifact;
+    # keep those bytes out of the message and events too.
+    result = store_if_artifact(result, scope_id)
+
     if not error_event_emitted:
         crewai_event_bus.emit(
             event_source,

lib/crewai/tests/tools/test_file_artifact.py

@@ -314,6 +314,39 @@ class TestNativeExecutorWiring:
         assert base64.b64decode(captured["content"]) == payload
 
 
+class TestAfterHookArtifact:
+    """An after_tool_call hook that returns a FileArtifact must still be stored."""
+
+    def test_hook_returned_artifact_is_replaced_by_handle(self) -> None:
+        from crewai.hooks.tool_hooks import (
+            register_after_tool_call_hook,
+            unregister_after_tool_call_hook,
+        )
+        from crewai.tools import BaseTool, FileArtifact
+
+        payload = bytes(range(256)) * 50
+
+        class Echo(BaseTool):
+            name: str = "echo"
+            description: str = "Echo"
+
+            def _run(self) -> str:
+                return "plain text"
+
+        def hook(_context):
+            return FileArtifact(data=payload, filename="hook.bin")
+
+        register_after_tool_call_hook(hook)
+        try:
+            run = _experimental_executor_runner([Echo()])
+            result = run("echo", "{}")["result"]
+        finally:
+            unregister_after_tool_call_hook(hook)
+
+        assert base64.b64encode(payload).decode() not in result
+        assert _HANDLE.search(result) is not None
+
+
 class TestTtlPrune:
     @staticmethod
     def _expire(handle: str) -> None: