diff --git a/ee/hogai/trends/nodes.py b/ee/hogai/trends/nodes.py
index 2697d5dc3f3a8..6ca6ed8b50d50 100644
--- a/ee/hogai/trends/nodes.py
+++ b/ee/hogai/trends/nodes.py
@@ -228,7 +228,7 @@ def run(self, state: AssistantState, config: RunnableConfig):
                 .format_messages(exception=e.errors(include_url=False))[0]
                 .content
             )
-            return {"intermediate_steps": [*intermediate_steps, (action, observation)]}
+            return {"intermediate_steps": [*intermediate_steps[:-1], (action, observation)]}
 
         # The plan has been found. Move to the generation.
         if input.name == "final_answer":
diff --git a/ee/hogai/trends/test/test_nodes.py b/ee/hogai/trends/test/test_nodes.py
index 184a81ef071e8..1371213cfeab8 100644
--- a/ee/hogai/trends/test/test_nodes.py
+++ b/ee/hogai/trends/test/test_nodes.py
@@ -4,7 +4,7 @@
 from langchain_core.messages import AIMessage as LangchainAIMessage
 from langchain_core.runnables import RunnableLambda
 
-from ee.hogai.trends.nodes import CreateTrendsPlanNode, GenerateTrendsNode
+from ee.hogai.trends.nodes import CreateTrendsPlanNode, CreateTrendsPlanToolsNode, GenerateTrendsNode
 from ee.hogai.trends.parsers import AgentAction
 from posthog.schema import AssistantMessage, ExperimentalAITrendsQuery, HumanMessage, VisualizationMessage
 from posthog.test.base import APIBaseTest, ClickhouseTestMixin, _create_event, _create_person
@@ -131,6 +131,35 @@ def test_agent_handles_output_with_malformed_json(self):
             self.assertIn("action_input", action.tool_input)
 
 
+@override_settings(IN_UNIT_TESTING=True)
+class TestCreateTrendsPlanToolsNode(ClickhouseTestMixin, APIBaseTest):
+    def test_node_handles_action_name_validation_error(self):
+        state = {
+            "intermediate_steps": [(AgentAction(tool="does not exist", tool_input="input", log="log"), "test")],
+            "messages": [],
+        }
+        node = CreateTrendsPlanToolsNode(self.team)
+        state_update = node.run(state, {})
+        self.assertEqual(len(state_update["intermediate_steps"]), 1)
+        action, observation = state_update["intermediate_steps"][0]
+        self.assertIsNotNone(observation)
+        self.assertIn("<pydantic_exception>", observation)
+
+    def test_node_handles_action_input_validation_error(self):
+        state = {
+            "intermediate_steps": [
+                (AgentAction(tool="retrieve_entity_property_values", tool_input="input", log="log"), "test")
+            ],
+            "messages": [],
+        }
+        node = CreateTrendsPlanToolsNode(self.team)
+        state_update = node.run(state, {})
+        self.assertEqual(len(state_update["intermediate_steps"]), 1)
+        action, observation = state_update["intermediate_steps"][0]
+        self.assertIsNotNone(observation)
+        self.assertIn("<pydantic_exception>", observation)
+
+
 @override_settings(IN_UNIT_TESTING=True)
 class TestGenerateTrendsNode(ClickhouseTestMixin, APIBaseTest):
     def setUp(self):