diff --git a/backend/app/api/endpoints/ai_builder.py b/backend/app/api/endpoints/ai_builder.py
index dcb0a966..c8771d16 100644
--- a/backend/app/api/endpoints/ai_builder.py
+++ b/backend/app/api/endpoints/ai_builder.py
@@ -195,6 +195,7 @@ async def scaffold(
             detail=f"AI returned invalid output: {e}",
         )
     except Exception as e:
+        logger.exception("AI scaffold failed: %s: %s", type(e).__name__, e)
         await record_ai_usage(
             user_id=current_user.id,
             account_id=current_user.account_id,
@@ -213,7 +214,7 @@ async def scaffold(
         await db.commit()
         raise HTTPException(
             status_code=status.HTTP_502_BAD_GATEWAY,
-            detail="AI provider error. Please try again.",
+            detail=f"AI provider error ({type(e).__name__}). Please try again.",
         )
 
     # Record successful usage
@@ -314,6 +315,7 @@ async def branch_detail(
             detail=f"AI returned invalid output: {e}",
         )
     except Exception as e:
+        logger.exception("AI branch_detail failed: %s: %s", type(e).__name__, e)
         await record_ai_usage(
             user_id=current_user.id,
             account_id=current_user.account_id,
@@ -332,7 +334,7 @@ async def branch_detail(
         await db.commit()
         raise HTTPException(
             status_code=status.HTTP_502_BAD_GATEWAY,
-            detail="AI provider error. Please try again.",
+            detail=f"AI provider error ({type(e).__name__}). Please try again.",
         )
 
     # Record successful usage