IMO AI agents harnesses (claude code, codex, etc) haven't added monorepo features yet as of a couple of months ago and thats what makes them painful. Basic things like, only apply these skills to the subdir that the .agents/skills directory exists in would go a long way. Or even reading the skills in a subdir .agents/skills directory. Or the ability to specify the basic monorepo custom VCS and other actions in a way that isn't limited to fragile skills and AGENTS.md specs that can get forgotten or unused as the context windows grows in a session and so on.