GitHub Copilot in 2025: Agents, PR Reviews & Coding on the Go

When GitHub Copilot first launched, it felt like a very clever autocomplete — one that could finish your function after reading a comment. That was already useful enough. But over the past year, Copilot has quietly grown into something much more interesting: an AI that can take on entire tasks end-to-end, leave review comments on your PRs like a senior teammate, and even follow you away from your desk via the GitHub mobile app. If your mental model of Copilot is still "it fills in my code as I type", this post is for you. Let me walk through the three changes that have made Copilot genuinely indispensable in my day-to-day workflow. 🤖 Copilot Agents: Let It Do the Whole Thing Agent mode is the headline feature of modern Copilot. Instead of suggesting the next line, you give Copilot a goal — "add input validation to the registration form and write tests for it" — and it figures out the steps on its own: reading the relevant files, making the changes, running tests, and fixing failures un