Devin

What it does

Devin takes an issue, plans the change, writes code, runs tests and opens a pull request in its own environment. The whole session is replayable, so a reviewer can see why a file changed.

It earns its price on well-scoped, well-tested work — migrations, small features, dependency bumps. It struggles when the requirement lives in someone's head rather than in the repository.

Standout features

• Plans and implements a full ticket
• Own shell, editor and test runner
• Replayable session log
• Opens pull requests for human review

Main job: turn a written ticket into a reviewable pull request, with the reasoning visible.

Best for

Use it for contained engineering tickets with clear acceptance criteria and a test suite that can tell you whether the change worked.

Getting started

Write the ticket with the expected behaviour and edge cases, connect the repository, then let it plan first and approve the plan. Review the pull request and the session log before merging.

Watch out for

Watch out: no autonomous agent should merge to production unsupervised. Keep secrets out of its environment and treat its tests as a starting point, not proof.