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apps/mcp-server/README.md

@@ -52,6 +52,8 @@ Use this workflow for every Footer menu edit:
 5. Apply the same operation with `dryRun: false` and the same version.
 6. Call `get_footer_menu` again to verify and obtain the next version.
 
+If an allowed Footer menu does not exist yet, `get_footer_menu` returns `exists: false`, `version: null`, and an empty item list. Previewing the first add returns `willCreateMenu: true`; applying that add creates the menu as active and inserts the first item atomically.
+
 Available item-level tools:
 
 - `add_footer_menu_item`