Apple opens Siri AI to third-party apps in iOS 27.3 developer preview

Apple's iOS 27.3 developer preview lets developers integrate Siri AI in all apps, using personal context, natural-language prompts and on-screen awareness. A new 'app skills' feature lets developers bundle several tasks into one action, and users won't need to name the app.

Why it matters: This makes Siri a routing layer over the app ecosystem, a distribution channel for agent-style actions to hundreds of millions of devices. It raises the stakes for rival assistants and puts app developers' action definitions in the same role tool schemas play for AI agents.