You'll notice
New hint text explains that deferred tools have no schema yet and must be fetched before they can be called.
New hint text explains deferred/lazy tool schemas: tools listed but not yet loaded have schemas that are NOT available, and calling them directly fails with InputValidationError. Their schemas must be requested via a discovery tool first, distinguishing them from tools that just became available and are ready to use immediately.
Names in the bundleInputValidationError