diff --git a/src/promptflow-core/promptflow/core/_prompty_utils.py b/src/promptflow-core/promptflow/core/_prompty_utils.py
index 47ef499ce1e..49dc1108adf 100644
--- a/src/promptflow-core/promptflow/core/_prompty_utils.py
+++ b/src/promptflow-core/promptflow/core/_prompty_utils.py
@@ -654,7 +654,7 @@ def try_parse_tool_call_id_and_content(role_prompt):
 def try_parse_tool_calls(role_prompt):
     # customer can add ## in front of tool_calls for markdown highlight.
     # and we still support tool_calls without ## prefix for backward compatibility.
-    pattern = r"\n*#{0,2}\s*tool_calls\s*:\s*\n+\s*(\[.*?\])"
+    pattern = r"\n*#{0,2}\s*tool_calls\s*:\s*\n+\s*(\[.*?\])\s*$"
     match = re.search(pattern, role_prompt, re.DOTALL)
     if match:
         try: