Codex skills: the 5-minute beginner guide

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If you've pasted the same instructions into Claude or ChatGPT five times this week, you need skills. By the end of this video you'll have your first Codex skill up and running — no prior experience needed — and everything here applies to Claude too. Skills make your AI agent remember a workflow forever, load it only when relevant, and even self-improve when you give feedback.

Think of a skill as an onboarding guide for a new hire: you don't re-explain your process every day — you hand them a document once and expect them to follow it. That's all a skill is: a markdown file of instructions the agent pulls up whenever the task calls for it.

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WHAT YOU'LL LEARN:
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1️⃣ HOW SKILLS ACTUALLY WORK Codex keeps every skill's title and description in context, but only loads the full document when it decides a skill is relevant — so you can have dozens of skills without slowing your agent down. And they're composable: the same skill works in Codex, Claude Code, or any agentic tool.

2️⃣ WHERE SKILLS LIVE Plugins → Skills in Codex. I show an installed design-taste skill (just a big markdown file), and you can tell Codex to find and install skills from GitHub on its own.

3️⃣ CREATE YOUR FIRST SKILL BY ASKING One prompt — "I never want em dashes in my writing, make a skill for that" — and Codex uses the skill creator to write and save it to your Personal Skills folder.

4️⃣ TEST THAT IT TRIGGERS In a fresh chat, Codex pulls the skill in automatically for a marketing email ("I'll use your no em dashes preference — this is user-facing copy"). You can also invoke any skill manually with a slash command.

5️⃣ BONUS: RECORD AND REPLAY Another way to create skills — /record-and-replay records your screen while you do a repeatable task, and Codex writes the skill from the recording. Full walkthrough in the linked video.

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KEY TAKEAWAYS:
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💡 A skill is an onboarding doc for your AI — write the process once, never re-explain it 💡 Titles + descriptions stay in context; full skills load on demand — dozens of skills cost you nothing
💡 Tiny preference skills work, but group small rules into bigger skills (one writing skill, not ten)
💡 Skills are portable across Codex, Claude Code, and other agentic tools
💡 If you give feedback, skills self-improve over time

⏰ TIMESTAMPS:

0:00 Stop pasting the same instructions into AI
What a skill is + how loading works
01:41 Where skills live in Codex (+ GitHub installs)
02:23 Creating your first skill (no em dashes)
03:12 Testing it in a fresh chat
04:11 Record and replay — skills from a screen recording

💬 COMMENT BELOW: What's the first skill you'd create — a writing rule, a workflow, or something else?

#codex #openai #aiskills #aiagent #claudecode #aitools #productivity #nocode