diff --git a/ai_planner.py b/ai_planner.py
index 9e88e56..5b53fb2 100644
--- a/ai_planner.py
+++ b/ai_planner.py
@@ -391,6 +391,16 @@ class AIPlanner:
         content_stripped = content.strip()
         reasoning_stripped = reasoning.strip()
 
+        if _glm_debug_enabled():
+            c_preview = (content_stripped[:120] + ("..." if len(content_stripped) > 120 else ""))
+            r_preview = (reasoning_stripped[:120] + ("..." if len(reasoning_stripped) > 120 else ""))
+            print(
+                "[GLM][디버그] extract_assistant_text | "
+                f"content_len={len(content_stripped)} reasoning_len={len(reasoning_stripped)} | "
+                f"content_looks_json={looks_like_json(content_stripped)} reasoning_looks_json={looks_like_json(reasoning_stripped)} | "
+                f"content_preview={c_preview!r} | reasoning_preview={r_preview!r}"
+            )
+
         if looks_like_json(content_stripped):
             return content_stripped
         if looks_like_json(reasoning_stripped):