Felix Arntz
@felixarntz.bsky.social
Software Engineer @ Vercel. WordPress Core Committer. Former Google. Runner, musician, movie geek. Aprendiendo español. Fueled by Mountain Dew.
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...
A New Chapter: Joining Vercel - felix-arntz.me
I’m joining Vercel to work on the AI SDK! Read about my transition from Google, my passion for AI tooling, and my future in WordPress.
felix-arntz.me
🚀 Announcing the WordPress AI Client SDK (v0.1.0)! It's never been easier to integrate generative AI into your plugins. ✅ Uniform API for any model (OpenAI, Google, etc.) ✅ WP-native fluent prompt builder ✅ Built-in admin screen for API keys Get started now. 👇
We use coding agents daily, for our own engineering efforts, or to power SaaS we build. Yet, almost all of these agents are tied to specific infrastructure - the vendor lock-in is real, flexibility is low. Introducing AI Code Agents, a TypeScript SDK to solve these issues. 👇
![import { createCodeAgent, createEnvironment } from 'ai-code-agents';
// Create a Docker environment (requires a running container)
const environment = createEnvironment('docker', {
containerId: 'my-container-id',
directoryPath: '/workspace',
});
// Create an agent with all tools
const agent = createCodeAgent({
model: 'anthropic/claude-sonnet-4.5',
environment,
environmentToolsDefinition: [
'get_project_file_structure',
'glob',
'read_file',
'write_file',
],
maxSteps: 10,
});
// Run the agent
const result = await agent.generate({
prompt: 'Create a simple Node.js HTTP server in server.js',
});](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:rtbrms3lua6blcgk3nryrbrg/bafkreidjjuvibl2vajecxgrnthwvwmlhqyektst5c74qaevjy4zmlmv3cq)
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...
TypeScript is the New Language of the AI Frontier, and I'm Excited - felix-arntz.me
From AI SDK to generative UI: The TypeScript ecosystem is shaping up to be at the forefront of AI application development.
felix-arntz.me
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...
Release 0.2.0 · WordPress/php-ai-client
What's Changed Introduce Props Bot workflow by @desrosj in #75 Add AGENTS.md by @felixarntz in #76 Allow retrieving all registered provider IDs from registry by @felixarntz in #79 GLOSSARY.md: Sma...
github.com
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. 🎉
AGENTS.md
AGENTS.md is a simple, open format for guiding coding agents. Think of it as a README for agents.
agents.md
If you want to play around with or explore the code of the WordPress AI chatbot agent demo from Matt Mullenweg's #WCUS keynote, here is the GitHub repository: github.com/felixarntz/w... There's also a screencast that shows a few things it can do: youtu.be/LX1kAR4Js98
GitHub - felixarntz/wp-ai-sdk-chatbot-demo: Implements a basic AI chatbot demo using the PHP AI Client SDK.
Implements a basic AI chatbot demo using the PHP AI Client SDK. - felixarntz/wp-ai-sdk-chatbot-demo
github.com
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!
Core AI: What We’re Building
A group presentation from the Core AI team on what we’re building. Progress since the team formation, next steps, implementation examples, and an open Q&A. Read more about the formation o…
us.wordcamp.org
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...
Webinar - The AI Services Plugin for WordPress: Build Smarter, Not Harder
YouTube video by TorontoDigits Academy
youtube.com
AI Services 0.7.0 is now available! This release adds text-to-speech and speech generation capabilities, as well as web search support to applicable providers. And, for the first time since launch, new providers were added, with Mistral, Perplexity, xAI. wordpress.org/plugins/ai-s...
AI Services
Makes AI centrally available in WordPress, whether via PHP, REST API, JavaScript, or WP-CLI - for any provider.
wordpress.org
Tune in this Wednesday to learn more about the latest WordPress Core Performance Team efforts, including the View Transitions plugin!
Henri Helvetica 🧑🏾🚀🇭🇹@henrihelvetica.bsky.social · last yr.✨ SPDY STREAM 005 ✨ A late Friday reveal. I'm thrilled to welcome @felixarntz.bsky.social next episode. He co-founded the #WordPress Core Performance Team in 2021. and is joining to talk all about it. 🔐 in! 📅 Wednesday July 23RD 🗣️ Felix Arntz ⏰ 1:00pm EST 🔗 bit.ly/spy-stream-005
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...
How Open Source Contributions Elevate Your Professional Journey - felix-arntz.me
Contributing to an open source project can drastically enhance your professional development and career. I share my personal experience here.
felix-arntz.me
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:
If you're curious what the initial priorities of the WordPress AI Team will be, look no further! Several posts were published earlier on the Make AI blog, with this article providing the comprehensive overview of all the building blocks: make.wordpress.org/ai/2025/07/1...
AI Building Blocks for WordPress
We’re creating technical Building Blocks that will allow users and developers to create powerful AI implementations within WordPress.
make.wordpress.org
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...
View Transitions
Adds smooth transitions between navigations to your WordPress site.
wordpress.org
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...
10 Lessons from 10 Years of Contributing to WordPress Core - felix-arntz.me
To celebrate 10 years of contributing to WordPress Core, I’m sharing 10 lessons that helped me become a long-term contributor.
felix-arntz.me
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...
Migrating Your JavaScript Codebase to TypeScript with AI - felix-arntz.me
Get inspired for AI assisted development through my experience of migrating a JavaScript codebase to TypeScript using Cline and Gemini.
felix-arntz.me
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.
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.
Felix Arntz@felixarntz.bsky.social · last yr.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...
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...
Introducing the View Transitions Plugin for WordPress - felix-arntz.me
Meet the new View Transitions plugin for WordPress by the Core Performance Team, which adds smooth page transition animations to your site.
felix-arntz.me
Want AI to generate your ALT text for you? Have a play around with the beta version of our plugin... filter.agency/filter-ai/
Filter AI WordPress Plugin - Filter
Filter AI brings the power of AI to WordPress, streamlining content creation and enhancing your editorial workflow.
filter.agency
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...
Speculative Loading, or A Brief History of Landing a Performance Feature in WordPress Core - felix-arntz.me
Join me as I share the process behind the speculative loading feature included in WordPress 6.8, from the early experiments to launch.
felix-arntz.me
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...
Deploying Your WordPress Plugin's "Tested Up To" Version Bump in Isolation - felix-arntz.me
Keeping the “Tested Up To” version of your WordPress plugin up-to-date on WordPress.org is crucial for ensuring compatibility and giving your users confidence. However, the process of manually updatin...
felix-arntz.me
Weeee my very first AI feature utilizing @felixarntz.bsky.social AI Services plugin. This feature integrates with our new Power Table block (fork of Flexible Table) in our block library to generate captions for Tables given their data and their table name if present.
Are you considering to use AI in your WordPress plugin? Check out the AI Services plugin documentation to get started with a provider agnostic API that you can use in your own plugin: felixarntz.github.io/ai-services/ 🎓
AI Services
Learn how to use the AI Services plugin, which makes AI centrally available in WordPress, whether via PHP, REST API, JavaScript, or WP-CLI - for any provider.
felixarntz.github.io
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 🚀
Building a CSS Carousel WordPress Block - Pascal Birchler
It's easier than ever to build modern UI components on the web, such as tooltips or CSS carousels. Even in WordPress blocks.
pascalbirchler.com
AI Services version 0.6.0 is out! This release adds multimodal output, letting you create both text and images using a single model. Other enhancements include PHP+JS code previews in the AI Playground, and updated support for Chrome's built-in AI. wordpress.org/plugins/ai-s...
AI Services
Makes AI centrally available in WordPress, whether via PHP, REST API, JavaScript, or WP-CLI - for any provider.
wordpress.org
