Same Skills standard, different host
Gemini implements the open Agent Skills standard. A SKILL.md written for Claude Code or Codex works in Gemini — same frontmatter, same body, same paths:. Drop the skill folder into .gemini/skills/<name>/ (project) or ~/.gemini/skills/<name>/ (user) and it's available as /name.
Cross-CLI portability is the whole reason the standard exists. A team-wide PR-summary Skill should not care which CLI a teammate is running.