diff --git a/backend/routers/prompts.py b/backend/routers/prompts.py
index a52ebe4..732bfea 100644
--- a/backend/routers/prompts.py
+++ b/backend/routers/prompts.py
@@ -53,6 +53,20 @@ def list_prompts(session: dict=Depends(require_auth)):
         return [r2d(r) for r in cur.fetchall()]
 
 
+@router.get("/placeholders")
+def list_placeholders_endpoint(session: dict=Depends(require_auth)):
+    """
+    Get grouped catalog of available placeholders with descriptions and examples.
+
+    Returns:
+        Dict mapping category to list of {key, description, example}
+
+    IMPORTANT: This endpoint MUST be defined BEFORE /{prompt_id} to avoid routing conflict.
+    """
+    profile_id = session['profile_id']
+    return get_placeholder_catalog(profile_id)
+
+
 @router.get("/{prompt_id}")
 def get_prompt(prompt_id: str, session: dict=Depends(require_auth)):
     """Get single AI prompt by ID (UUID)."""