diff --git a/python/sglang/srt/server_args.py b/python/sglang/srt/server_args.py
index c7c91e1d5..9709f9ef7 100644
--- a/python/sglang/srt/server_args.py
+++ b/python/sglang/srt/server_args.py
@@ -1728,7 +1728,10 @@ class ServerArgs:
             "1" if self.enable_deterministic_inference else "0"
         )
         # Set the highest strict level for Kimi K2 tool calls
-        if self.tool_call_parser == "kimi_k2":
+        if (
+            self.tool_call_parser == "kimi_k2"
+            and not envs.SGLANG_TOOL_STRICT_LEVEL.is_set()
+        ):
             envs.SGLANG_TOOL_STRICT_LEVEL.set(ToolStrictLevel.PARAMETER)
 
     def _handle_cache_compatibility(self):