Searches your session history across Claude Code, Codex, and Cursor to answer questions about what you worked on before. Ask it what was tried in past sessions, how a problem was investigated, or what happened recently, and it will scan the last week or month depending on your question. The guardrails are notable: it never reads full session files (they can be 7MB), always filters first, and explicitly avoids dumping tool outputs or thinking blocks into your current context. It's branch-aware for Claude Code sessions and falls back to keyword matching when branch filtering comes up empty. Useful when you remember debugging something two weeks ago but can't recall which session or what the conclusion was.
npx skills add https://github.com/everyinc/compound-engineering-plugin --skill ce-sessions