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LLM_MCP_GUIDE.md

@@ -190,6 +190,8 @@ Use `get_page_section` with `lang=all` only when every stored language map is ge
 
 Use `update_footer_menu_item_translation` for one language at a time. Use `reorder_footer_menu_items` only with the complete list of current item IDs. If the backend returns `MENU_VERSION_CONFLICT`, discard the old version and read the menu again.
 
+An allowed Footer menu may not exist before its first item is saved. In that case, `get_footer_menu` returns `exists=false` and `version=null`. Run `add_footer_menu_item` with `dryRun=true`; a `willCreateMenu=true` preview confirms that the actual add will create the active menu and first item atomically.
+
 Do not use legacy `update_footer_content` for menu arrays. It remains available only for the Footer brand description and social links. Website Collections come from Categories, not a Footer menu.
 
 ## What to Expect