About four months ago, I started using coding agents, beginning with Codex. Small tasks went well. I could describe a change, inspect the result, and move on. Longer projects felt different. As a conversation grew, it accumulated more than code: why I had chosen a direction, which alternatives I had rejected, what I wanted to leave alone, and the boundaries of the work. Some of that understanding lived only in the session. I became reluctant to replace it. I worried that a fresh agent woul...