Put SKILL.md in a code-review/ folder for Codex, OpenCode, or Claude Code; for 
Pi monorepos, keep repo-specific commands and boundaries in AGENTS.md and let 
this skill handle the review behavior. Claude Code and OpenCode both support 
SKILL.md, while Pi-family repos commonly rely on AGENTS.md plus discovered project 
config.

The AGENTS.md file makes the repository automatically treat review work as a 
durable, artifact-producing workflow instead of an ephemeral chat response.

Put it near your repo workflow rules in AGENTS.md, and keep the reusable 
deep-review instructions in code-review/SKILL.md so the agent has both 
invocation policy and review behavior.