The only skill I genuinely find useful is the /strategic-compact from ecc (everything Claude Code) but you can get the same effect by saying something like "I am going to compact the session, give the next Claude session a summary of what was added or changed and what the next step is". The you can just use /compact <message>. Other than that, just barebone too. ECC is shipped with something like 300 skills, maybe I should just delete it!