Agents don't forget because the model is bad. They forget because we built it into them. Six hours and forty messages in, what an agent needs is gone — or still there but wrong, drowned in noise.

That's context rot.

I've spent the last month inside a team of always-on AI agents that run for weeks. Different jobs, one codebase, one shared vault of lessons. They review each other's PRs, publish, plan. And they rot. I watched every flavor of it, then built the countermeasures.

What context rot is

Four failures that compound.