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Cross-platform portability

Making one skill or instruction file work across Claude, ChatGPT, Codex, Gemini and Cursor.

Entries

• Agent Skills specification

  The open SKILL.md format that lets one skill folder work in Claude, ChatGPT, Codex, Gemini CLI, Cursor, GitHub Copilot and dozens of other agents.

  Standard by Agent Skills (originally developed by Anthropic) Claude apps, Claude Code, ChatGPT, Codex, Gemini, Cursor, Any agent

  Official Reviewed — safe to install Guidance only

• AGENTS.md

  A plain Markdown file at the root of a repo that tells any coding agent how to build, test and work in the project.

  Standard by Agentic AI Foundation (Linux Foundation) Codex, Claude Code, Cursor, Gemini, Any agent

  Official Reviewed — safe to install Guidance only

• OpenAI plugins & Apps SDK

  OpenAI's official way to package skills, an MCP server and optional UI into one plugin that people install from a shared ChatGPT and Codex directory.

  Tool by OpenAI ChatGPT, Codex

  Official Reviewed — safe to install Guidance only

• skills CLI (npx skills)

  Installs Agent Skills from GitHub, GitLab, any git URL or a local folder into Claude Code, Codex, Cursor, Gemini CLI and 75+ other agents with one command.

  Tool by Vercel Labs Claude Code, Codex, Cursor, Gemini, Any agent

  Official Reviewed — install with care Runs on your machine

Curated by Andrew Borden-Chisholm. Notes on building with these tools are on the blog.