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Xcode 26.3 hands on: AI agent coding is astoundingly fast, smart, and too convenient

The improved AI agent access in Xcode has made vibe coding astoundingly simple for beginners, to a level where some apps can be made without manually writing any code at all. Here’s what we found.

Hand holding a smartphone showing a dark Pomodoro timer app, with a large 25-minute countdown, in front of a computer screen displaying the app's light-mode design and surrounding code.
It took a ridiculously short time to make a simple iPhone app using agentic coding

The concept of vibe coding is one where the user defines to an AI chatbot or agent what to code, and then the agent codes it for them. The intention was previously to be an extension of the commonly found code suggestion and completion systems that you would normally find in a development environment.

Over time, and with the increased sophistication of said AI tools, it’s become more involved. A person can describe to an agent a general concept for what they want to produce, and it will come up with functions or even complete apps, some of the time.

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