> Markdown version of [/magazine/731-dev-digest-217-all-about-cookies-better-agents-how-openai-built-codex](https://www.wearedevelopers.com/magazine/731-dev-digest-217-all-about-cookies-better-agents-how-openai-built-codex). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

---

# Dev Digest 217: All About Cookies, Better Agents & How OpenAI Built Codex

**By:** [Daniel Cranney](https://www.wearedevelopers.com/@daniel-cranney)

**Published:** April 27, 2026

## Inside last week’s [Dev Digest 217](https://newsletter.wearedevelopers.com/217).

https://www.youtube.com/embed/qlCb9dQyxhM

🍪 All you ever wanted to know about cookies  
🤖 Why ChatGPT cites one page over another  
🛠️ How to build better agents  
🌐 Is your site agent ready?  
🔐 Get started on GitHub Actions security  
🧠 How OpenAI built Codex  
🧹 Getting rid of 15k circular dependencies  
🎬 Generating videos with HTML, CSS and JS  
🎮 Doom as a text adventure  
💻 Should designers code?

🗞️ Join over 200,000 developers already subscribed to the Dev Digest to get your weekly round-up of tech news, tips and tricks, jobs, events and more, delivered to your inbox. [Subscribe here](https://wearedevelopers.com/devdigest).



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