diff --git a/src/pipecat/processors/aggregators/llm_response_universal.py b/src/pipecat/processors/aggregators/llm_response_universal.py
index 51dfcb94d..841ac1727 100644
--- a/src/pipecat/processors/aggregators/llm_response_universal.py
+++ b/src/pipecat/processors/aggregators/llm_response_universal.py
@@ -1061,7 +1061,14 @@ class LLMAssistantAggregator(LLMContextAggregator):
             self._context.add_message(
                 {
                     "role": "tool",
-                    "content": json.dumps({"type": "tool", "status": "started"}),
+                    "content": json.dumps(
+                        {
+                            "type": "async_tool",
+                            "status": "started",
+                            "tool_call_id": frame.tool_call_id,
+                            "description": "The tool associated with this tool_call_id is still in progress, and the result is not yet available. It will be provided in a subsequent message with the same tool_call_id.",
+                        }
+                    ),
                     "tool_call_id": frame.tool_call_id,
                 }
             )
@@ -1104,7 +1111,7 @@ class LLMAssistantAggregator(LLMContextAggregator):
                     "role": "developer",
                     "content": json.dumps(
                         {
-                            "type": "tool",
+                            "type": "async_tool",
                             "tool_call_id": frame.tool_call_id,
                             "status": "finished",
                             "result": result,
diff --git a/src/pipecat/utils/context/llm_context_summarization.py b/src/pipecat/utils/context/llm_context_summarization.py
index 53a353992..afb0ecd1f 100644
--- a/src/pipecat/utils/context/llm_context_summarization.py
+++ b/src/pipecat/utils/context/llm_context_summarization.py
@@ -388,7 +388,7 @@ class LLMContextSummarizationUtil:
 
         A tool message is considered pending (unresolved) when its content is
         the synchronous ``"IN_PROGRESS"`` sentinel or the async
-        ``{"type": "tool", "status": "started"}`` marker — both indicate
+        ``{"type": "async_tool", "status": "started"}`` marker — both indicate
         that the actual result has not yet been written back to the context.
 
         Args:
@@ -403,7 +403,7 @@ class LLMContextSummarizationUtil:
             parsed = json.loads(content)
             if (
                 isinstance(parsed, dict)
-                and parsed.get("type") == "tool"
+                and parsed.get("type") == "async_tool"
                 and parsed.get("status") == "started"
             ):
                 return True
@@ -474,14 +474,14 @@ class LLMContextSummarizationUtil:
                         pending_tool_calls.pop(tool_call_id)
 
             # Check for async tool completion — a developer message with
-            # {"type": "tool", "status": "finished"} signals that the
+            # {"type": "async_tool", "status": "finished"} signals that the
             # async result has arrived and the call is now resolved.
             if role == "developer":
                 try:
                     parsed = json.loads(msg.get("content", ""))
                     if (
                         isinstance(parsed, dict)
-                        and parsed.get("type") == "tool"
+                        and parsed.get("type") == "async_tool"
                         and parsed.get("status") == "finished"
                     ):
                         tool_call_id = parsed.get("tool_call_id")