I used Copilot for two years. Every day. It was my pair programmer, my autocomplete, my inline documentation. I defended it against everyone who said agents would replace it.
Then I tried a terminal agent for one week. I haven’t opened Copilot since.
What Copilot Does Well
Copilot is great at the micro-loop. You type a function name, it suggests the body. You write a comment, it suggests the implementation. The feedback is instant. The context is your current file. The cognitive overhead is zero.
For two years, that was enough. I didn’t know what I was missing because I’d never experienced anything faster.
The Terminal Agent Difference
The first time I asked Claude Code to “refactor this module to use the repository pattern instead of active record,” I expected to guide it through every step. Instead, it:
- Read all 12 files in the module
- Understood the current architecture
- Planned the refactor sequence
- Made changes across 8 files
- Ran the test suite
- Fixed 2 tests it broke
- Committed the result
Total time: 4 minutes. Total questions I answered: zero.
Copilot couldn’t do this because Copilot doesn’t see the full codebase. It sees one file at a time. Refactoring across multiple files requires a human to coordinate. Terminal agents don’t have that limitation.
What You Lose
Terminal agents require a different workflow:
- You type commands instead of tab-completing
- You review diffs instead of accepting inline suggestions
- You describe intent in natural language instead of coding it yourself
The first few days feel slower. You’re fighting the interface instead of flowing with it. But by day 3, something clicks. You realize the agent isn’t an autocomplete — it’s a teammate.
What You Gain
The productivity jump isn’t incremental. It’s categorical. Tasks that took 30 minutes now take 5. Refactors you’d postpone for weeks happen in an afternoon. You stop thinking about how to implement things and start thinking about what to build.
Copilot made me faster at typing. Terminal agents made me faster at shipping. The difference is bigger than I expected.