One SKILL.md, Every Agent: How to Build a Single Agent Skill That Works in Claude Code, Codex, Cursor, ChatGPT & Copilot

Description and use

<p><strong>Quick Answer:</strong> Yes — one SKILL.md can run across agents. Since 22 October 2026, Agent Skills is a vendor-neutral standard under the Linux Foundation, already adopted by 70+ platforms. A skill works everywhere if it (1) uses only the spec's frontmatter fields, (2) lives in the shared <code>.agents/skills</code> folder, and (3) is copied or linked into each agent's own folder. Below: the full folder map, the portability rules, and a complete tested example you can copy.</p> <p><em>Last verified: October 2026</em></p> <h2> What changed on 22 October 2026 — Agent Skills got a ne

Problem

<p><strong>Quick Answer:</strong> Yes — one SKILL.md can run across agents. Since 22 October 2026, Agent Skills is a vendor-neutral standard under the Linux Foundation, already adopted by 70+ platforms. A skill works everywhere if it (1) uses only the spec's frontmatter fields, (2) lives in the shared <code>.agents/skills</code> folder, and (3) is copied or linked into each agent's own folder. Below: the full folder map, the portability rules, and a complete tested example you can copy.</p> <p><em>Last verified: October 2026</em></p> <h2> What changed on 22 October 2026 — Agent Skills got a ne

Outcome

<p><strong>Quick Answer:</strong> Yes — one SKILL.md can run across agents. Since 22 October 2026, Agent Skills is a vendor-neutral standard under the Linux Foundation, already adopted by 70+ platforms. A skill works everywhere if it (1) uses only the spec's frontmatter fields, (2) lives in the shared <code>.agents/skills</code> folder, and (3) is copied or linked into each agent's own folder. Below: the full folder map, the portability rules, and a complete tested example you can copy.</p> <p><em>Last verified: October 2026</em></p> <h2> What changed on 22 October 2026 — Agent Skills got a ne

Evidence

One SKILL.md, Every Agent: How to Build a Single Agent Skill That Works in Claude Code, Codex, Cursor, ChatGPT & Copilot

Source