+1 we ended up adding something to our CLAUDE.md specifically to counter it. Something along the lines of "comments should be treated the same as production code, they shouldn't leak the content of conversations and stand the test of time". It doesn't always work, as other people say claude stops following these the more its context window gets filled, but now it's mostly a matter of telling it in a new session to review the changes against the guidance on comments and clean them up.

We have it as well, but it almost never get respected and we still see those lengthy comments. Anyone seen better luck?

I mean I do the same at work where we currently use Anthropic, but we are also on a token optimisation drive so it’s getting hard to justify spending even more tokens cleaning up after Anthropic’s garbage by paying Anthropic more. We have started having users use GPT 5.6 Sol to compare quality and effficiency over Opus. Fable not happening at work because of the data sharing clauses and the completely nuts pricing.