Yes
My main motivation was simply to save tokens, but it actually worked really well and improved speed as well
DanielHB on Hacker News
In the thread “Agent memory as a file format”, replying to this comment
Helped: Using a plan link in clean sessions to save tokens.
… Works pretty well for "non-permanent" instructions (you don't want to put this info into your committed markdowns). My main motivation was simply to save tokens, but it actually worked really well and improved speed as well.