We use Claude Code in our company and I also agree memories go stale and pollute the context over time, especially when the state changes externally. E.g. someone does a refactor or introduces a pattern and I was not involved in developing it so my local memories did not get aligned.

My most recent example were some deprecated and archived repos that kept getting added to plans for patching issues.

We use a private Claude plugin marketplace for internal plugins and skills and I try to regularly prune my memory, migrating relevant stuff to a proper home (skills in the marketplace, docs in repos or Notion etc) and prune outdated information.