Namespacing
Each tool is listed with its full namespaced name (namespace.tool), so identically named tools from two different backends never collide.
Per-tool toggles
Unlike the server-level enable/disable in Backend Servers, the catalog lets you turn off individual tools without disabling the whole server they came from — useful when a backend exposes more capability than you want to expose to your AI client. A disabled tool stops appearing intools/list responses from the aggregated endpoint and can’t be called, even if the client requests it by name.