043 - Claude.md vs AGENTS.md vs Skills

A simple guide to CLAUDE.md, AGENTS.md, and skills in Claude Code and Codex. Learn where each one lives, what it does, when to use it, and how to decide whether something belongs in persistent project instructions or a reusable skill. Voice narration is AI-generated. References Anthropic — Claude Code documentation https://docs.anthropic.com/en/docs/claude-code Anthropic — Claude Code Skills https://docs.anthropic.com/en/docs/claude-code/skills OpenAI — Codex documentation https://developers.openai.com/codex/ OpenAI — Codex Skills https://developers.openai.com/codex/skills/ Martin Fowler / Thoughtworks — Context Engineering for Coding Agents https://martinfowler.com/articles/exploring-gen-ai/context-engineering-coding-agents.html