Devin — Cognition's Autonomous Coding Agent

Code completion is synchronous — you type, it suggests. Devin is asynchronous — you file a task, it goes away, it returns with a pull request. The whole loop takes minutes to hours rather than milliseconds.

Cognition has published evidence that Devin uses a 'single thread of execution' philosophy — one agent, long context, explicit plan — rather than many small agents. They've argued that multi-agent coding systems often drift, and that a single agent with good scaffolding tends to win on coding work.

Devin itself is internally cohesive. But as an A2A participant, it fits the task-handoff model well — send Devin a task, poll its status, receive a completed artifact — which is exactly the shape A2A standardises.