diff --git a/pipeline_service/agent_loop.py b/pipeline_service/agent_loop.py
index b38663f..82d3456 100644
--- a/pipeline_service/agent_loop.py
+++ b/pipeline_service/agent_loop.py
@@ -467,13 +467,13 @@ def _parse_agent_action(raw):
     if raw.startswith("```"):
         raw = raw.split("\n", 1)[1].rsplit("```", 1)[0].strip()
 
-    # deepseek 原生 function calling 输出 XML：<tool_calls><invoke name="..."><parameter name="...">...</parameter></invoke></tool_calls>
-    m = re.search(r'<invoke\s+name="([^"]+)"\s*>(.*?)</invoke>', raw, re.DOTALL)
+    # deepseek 原生 function calling 输出 XML：<tool_calls><invoke name="..."><parameter name="..." string="true">...</parameter></invoke></tool_calls>
+    m = re.search(r'<invoke\s+name="([^"]+)"[^>]*>(.*?)</invoke>', raw, re.DOTALL)
     if m:
         tool = m.group(1).strip()
         body = m.group(2)
         params = {}
-        for pm in re.finditer(r'<parameter\s+name="([^"]+)"\s*>(.*?)</parameter>', body, re.DOTALL):
+        for pm in re.finditer(r'<parameter\s+name="([^"]+)"[^>]*>(.*?)</parameter>', body, re.DOTALL):
             val = pm.group(2).strip()
             try:
                 val = json.loads(val)