codex Custom Prompts Deprecated. Use skills for reusable prompts

[1012302887]

[novadev94]

Not just Codex but Claude Code too https://code.claude.com/docs/en/skills

Custom slash commands have been merged into skills. A file at .claude/commands/review.md and a skill at .claude/skills/review/SKILL.md both create /review and work the same way. Your existing .claude/commands/ files keep working. Skills add optional features: a directory for supporting files, frontmatter to control whether you or Claude invokes them, and the ability for Claude to load them automatically when relevant.

Both OpenSpec skills & commands' description are loaded into the context window, and it's quite wasteful.