The skill mostly matches its stated agent-optimization purpose, but it needs Review because it stores prompt content locally, includes an unsafe self-test that deletes its real home-directory state, and contains under-disclosed guidance for unsolicited influence.
Install only if you are comfortable with an agent-side behavior-shaping skill that keeps local state under ~/.arena_turn and may store prompt previews there. Avoid running scripts/selftest.sh on a real profile unless you are willing to lose that directory's state. Review or disable the quarry guidance if you do not want the agent to add unsolicited creative expansions without explicit consent.