cognition
2 articles
The Honest Multi-Agent Report, 10 Months Later — Cognition's Walden: Keep Writes Single-Threaded, Let Other Agents Pour In Intelligence
Ten months after writing Don't Build Multi-Agents, Cognition's Walden Yan returns with three patterns that actually ship: Devin Review's clean-context loop (2 bugs per PR, ~58% severe), cross-frontier smart friends, and manager Devin's map-reduce-and-manage. One principle runs through all three — writes stay single-threaded; other agents contribute intelligence, not actions.
Self-Healing PRs — Devin Autofix Lets Humans Just Make the Final Call
Cognition ships Devin Autofix: review bot comments auto-trigger fixes → CI reruns → loop until clean. Humans only step in for architecture calls. Key insight: a single agent is a tool, but agent + reviewer loop is a system — and systems compound.