Agree, but current agents don't help with that. I use Copilot, and you can't even dump it preserving complete context, including images, tool call results and subagent outputs. And even if you could, you'd immediately blow up the context trying to ingest that. This needs some supporting tooling, like in today's submission where agent accesses terabytes of CI logs via ClickHouse.

I've had some luck creating tiny skills that produce summaries. E.g. a current TASK.md is generated from a milestone in PLAN.md, and when work is checked in STATUS.md and README.md are regenerated as needed. AGENTS.md is minimal and shrinking as I spread instructions out to the tools.

Part of my CI process when creating skills involves setting token caps and comparing usage rates with and without the skill.