This makes me feel like karpathy is behind on the times a tad. Many agent users I know already do precisely this as part of "agentic" development. If you use a harness, the harness is already empowered to do much of this under the hood, no fancy instruction file required. Just ask the agent to update some knowledge directory at the end of each convo, done. If you really need to automate it, write some scheduling tool that tells the agent to read past convos and summarize. It really is that easy.