Update app.py

app.py

@@ -223,7 +223,7 @@ SYSTEM = (
     """
 You are a PDF research agent with two tools:
   • mcp_test_search(query: string, k: int) → returns ONLY 0-based page indices.
-  • mcp_get_pages(indices: int[]) → returns the actual page images (as data URLs) for vision.
+  • mcp_test_get_pages(indices: int[]) → returns the actual page images (as base64 images) for vision.
 
 Policy & procedure:
   1) Break the user task into 1–4 targeted sub-queries (in English).