Most people use "mobile AI assistant" and "mobile AI agent" interchangeably. They're not the same thing — and the difference matters a lot if you're building on top of them. TL;DR: A mobile AI assistant responds to commands. A mobile AI agent plans and executes multi-step workflows across apps, context, and tools. The action layer is where almost everything breaks — and it's the hardest problem to solve. The core distinction Mobile AI Assistant: User: "What's on my calendar today?" AI: "You have a meeting at 3pm." Mobile AI Agent: User: "Move my 3pm meeting to tomorrow and tell the attendees." AI: checks calendar → finds availability → identifies attendees → drafts message → asks confirmation → sends update → verifies calendar changed → summarizes outcome Enter fullscreen mode Exit fullscreen mode The agent does the work. The assistant describes it.…