15 SKILL.md Playbooks That Work Across Cursor, Codex, and Antigravity

Since its release in August 2025, the AGENTS.md open format has been widely adopted by over 60,000 open-source projects, with the Agent Skills SKILL.md standard being utilized by 32 tools such as Claude Code, OpenAI Codex, Cursor, and Gemini CLI. The SKILL.md format allows the creation of reusable, task-scoped skills defined with YAML frontmatter and markdown instructions, offering partial portability across different agents due to varying install paths and loading behaviors. The guide provides 15 playbooks for SKILL.md and AGENTS.md patterns that can be reused across multiple agents, highlighting areas where integration may fail due to tool-specific constraints. While the SKILL.md format standardizes the file content, installation paths differ among tools, requiring manual placement in specific directories for each agent. The AGENTS.md file, contrastingly, offers persistent project rules and is supported differently across agents, with varying levels of native support. Evaluations of these playbooks emphasize cross-agent portability, context efficiency, determinism, safety, and maintenance cost, aiming to enhance the reusability and reliability of skills. As agents increasingly interact with external systems via the Model Context Protocol, skills related to security, identity, and cross-agent maintenance are becoming more critical, ensuring that agents operate autonomously without compromising security or functionality.

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