Felix Arntz

I'm super excited to share my next adventure: Later this month, I'll be joining @vercel.com to work on the AI SDK! 🎉 felix-arntz.me/blog/joining...

Introducing the WordPress AI Client SDK: make.wordpress.org/ai/2025/11/2...

I believe the biggest innovations in the AI application layer are happening right now in the TypeScript ecosystem. The AI tooling revolution is finally meeting the web development community somewhere they live. Read more on my perspective and excitement: felix-arntz.me/blog/typescr...

The PHP AI Client SDK version 0.2.0 is out now, with several key enhancements and fixes for more developer convenience. If you haven't yet, give it a try to build your invisible AI features, agents, and workflows in a model agnostic way. Release notes: github.com/WordPress/ph...

Awesome news for OSS projects embracing AI assisted coding: agents.md Finally projects can provide LLM instructions without favoring a specific provider or tool, and without including duplicate instructions files. A simple yet huge step in the right direction. 🎉

We are a looking for questions and potential discussion points for the WordPress AI Panel about what we're building, next week at #WCUS: us.wordcamp.org/2025/session... If you have something you'd like to have us discuss or cover, please reply to this thread!

I had a great time doing this Startup Grind webinar about the AI Services plugin for WordPress. Lots of live demos and context for how to use it, how it ties in with the WordPress AI Team efforts, etc. Take a look! www.youtube.com/watch?v=by7Q...

Tune in this Wednesday to learn more about the latest WordPress Core Performance Team efforts, including the View Transitions plugin!

Looking back at 10 years of contributions to WordPress Core, I feel extremely grateful, but I also feel proud. It made me think about how much giving back to open source can give back to you. I put together some related thoughts and personal stories: felix-arntz.me/blog/open-so...

The WordPress AI team just published our first set of roadmap updates. We're building foundational tools that help developers ship AI-powered features the WordPress way. Let’s break down what we’re working on:

View Transitions 1.1.0 is out! Adding view transitions for WP Admin (opt-in), control over the transition duration, better interoperability with theme support, and compatibility with reduced motion preferences for accessibility. Give it a try: wordpress.org/plugins/view...

10 years ago today, I got my first props for contributing to WordPress Core. I've been contributing ever since, and it changed my life in so many ways. Here's 10 valuable lessons learned, which will hopefully help other current and future contributors: felix-arntz.me/blog/10-less...

In 24 hours, James LePage, @jeffpaul.com, @swissspidy.bsky.social and myself will be discussing AI and WordPress in a panel as part of the #TheAgencyAdvantage virtual conference. Happening on June 24 at 12pm ET. Join us: www.cloudways.com/en/agency-ad...

I recently migrated the ~80 file JavaScript codebase of the AI Services WordPress plugin to TypeScript - a perfect use-case for AI assistance, for such a beneficial yet tedious task. Read more about how using Cline and Gemini sped things up substantially: felix-arntz.me/blog/migrati...

Coming soon in the View Transitions plugin for WordPress: View transitions for WP Admin! This idea started at the #WCEU Contributor Day, and Mukesh Panchal has been bringing it to fruition. 🎉 Making WP Admin feel like an SPA without it suffering the complexity of being one.

New profile picture (about time)! Thanks to @nilovelez.com for capturing me at #WCEU!

Are you attending #WCEU #ContributorDay today? At the Core Performance Table, the brand new View Transitions plugin will be a key focus for the day. Help test and get involved! I'd love to see you there.

Introducing... View Transitions is the latest WordPress plugin from the Core Performance Team, replacing the hard page loads between URLs with smooth animations to improve UX. Previously this required a complex SPA, now it simply works with a plugin. felix-arntz.me/blog/introdu...

Want AI to generate your ALT text for you? Have a play around with the beta version of our plugin... filter.agency/filter-ai/

Two years ago today, I opened an experimental pull request for a "Speculation Rules" module in the Performance Lab plugin. Little did I know then that it would launch as a key feature of WordPress 6.8 last month. Join me as I share the process behind it: felix-arntz.me/blog/specula...

As a WordPress plugin author, bumping the "Tested Up To" version in the WordPress directory can be tedious, especially if you maintain several plugins. Fortunately you can automate this safely, without risk of deploying other changes. More in this post: felix-arntz.me/blog/deployi...

There is a new web platform feature that allows you to build performant and accessible carousels entirely using CSS. Say goodbye to bulky JavaScript slider libraries! As a proof of concept, I built a CSS-only carousel block for WordPress. Go check it out 🚀

Speculative loading is only one of many performance improvements in WordPress 6.8! Learn more about all things performance that this release has to offer below 👇 This post is the latest in the performance improvements series of WordPress major releases: make.wordpress.org/core/2025/04...

The future of generative AI, or I should rather say the present, is about multimodal inputs and outputs. APIs and SDKs not built with that in mind will need to be rearchitected soon, if not already.

Are you using the WordPress Interactivity API? If so, please read on about what is going to change in WordPress 6.8. Spoiler alert: Performance enhancements incoming! make.wordpress.org/core/2025/03...