iOS 27 introduces two new developer tools — entity schemas (index cards that tell Siri what type of content something is) and intent schemas (a list of actions Siri is permitted to take inside an app). Until the official fall release, Apple's Xcode beta doesn't allow developers to ship these capabilities, meaning every Siri demo and review right now only shows Apple's own apps working. Third-party support, including from Google, is the make-or-break variable.