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Felix Arntz

@felixarntz.bsky.social
1.1K followers 143 following 108 posts

Software Engineer @ Vercel. WordPress Core Committer. Former Google. Runner, musician, movie geek. Aprendiendo español. Fueled by Mountain Dew.

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Felix Arntz @felixarntz.bsky.social · 08/01/2026
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...
felix-arntz.me
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.
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Felix Arntz @felixarntz.bsky.social · 21/11/2025
Introducing the WordPress AI Client SDK: make.wordpress.org/ai/2025/11/2...
A terminal including a PHP source code example for using the WordPress AI Client SDK
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Felix Arntz @felixarntz.bsky.social · 14/11/2025
You can use the SDK by including it in your plugin. Simply install it via Composer. Additional features like REST API and client-side API surface coming soon. Learn more: github.com/WordPress/wp...
composer require wordpress/wp-ai-client
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Felix Arntz @felixarntz.bsky.social · 14/11/2025
🚀 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. 👇
use WordPress\AI_Client\AI_Client;

$text = AI_Client::prompt( 'Write a 2-verse poem about PHP.' )
	->using_system_instruction( 'You are a famous poet from the 17th century.' )
	->using_temperature( 0.8 )
	->generate_text();
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Felix Arntz @felixarntz.bsky.social · 06/11/2025
GitHub: github.com/felixarntz/a...
github.com
GitHub - felixarntz/ai-code-agents: A TypeScript SDK for creating coding agents that can interact with various sandboxed execution environments - built on top of the AI SDK
A TypeScript SDK for creating coding agents that can interact with various sandboxed execution environments - built on top of the AI SDK - felixarntz/ai-code-agents
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Felix Arntz @felixarntz.bsky.social · 06/11/2025
AI Code Agents is built on top of the @aisdk, providing code execution environment abstractions and their concrete implementations, as well as the tools to operate on them. Fast onboarding, full flexibility, no more lock-in. Learn more in the blog post: felix-arntz.me/blog/introdu...
felix-arntz.me
Introducing AI Code Agents: A TypeScript SDK to Solve Vendor Lock-in for Coding Agents - felix-arntz.me
Introducing AI Code Agents: a TypeScript SDK to eliminate vendor lock-in by abstracting AI coding tools and sandboxed execution environments.
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Felix Arntz @felixarntz.bsky.social · 06/11/2025
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',
});
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Felix Arntz @felixarntz.bsky.social · 23/10/2025
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...
felix-arntz.me
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.
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Felix Arntz @felixarntz.bsky.social · 21/10/2025
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...
github.com
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...
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Felix Arntz @felixarntz.bsky.social · 22/09/2025
en.m.wikipedia.org/wiki/I%27m_a...
en.m.wikipedia.org
I'm a Cyborg, But That's OK - Wikipedia
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Felix Arntz @felixarntz.bsky.social · 31/08/2025
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
AGENTS.md is a simple, open format for guiding coding agents. Think of it as a README for agents.
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Felix Arntz @felixarntz.bsky.social · 30/08/2025
Both of the underlying WordPress projects, the PHP AI Client SDK and the Abilities API, are available now in a first release: github.com/WordPress/ph... github.com/WordPress/ab...
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Felix Arntz @felixarntz.bsky.social · 30/08/2025
Remember this is only a demo, so it has access to a few limited tools. But it's not meant to be a comprehensive agent implementation that can do everything you might want. It's an example for what's possible.
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Felix Arntz @felixarntz.bsky.social · 30/08/2025
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.com
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
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Felix Arntz @felixarntz.bsky.social · 21/08/2025
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!
us.wordcamp.org
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…
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Felix Arntz @felixarntz.bsky.social · 18/08/2025
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...
youtube.com
Webinar - The AI Services Plugin for WordPress: Build Smarter, Not Harder
YouTube video by TorontoDigits Academy
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Felix Arntz @felixarntz.bsky.social · 29/07/2025
Build powerful AI features for your WordPress plugin today, based on AI Services 0.7.0! Full changelog: github.com/felixarntz/a... WordPress plugin homepage: wordpress.org/plugins/ai-s... Try it in the WordPress Playground: playground.wordpress.net?mode=seamles...
github.com
Release 0.7.0 · felixarntz/ai-services
Features: Add support for Mistral AI with text generation, multimodal input, and function calling. (5e6d4fe) Add support for Perplexity AI (Sonar models) with text generation, multimodal input, an...
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Felix Arntz @felixarntz.bsky.social · 29/07/2025
You may be wondering how AI Services fits into the new WordPress AI Team: The new PHP AI Client SDK (github.com/WordPress/ph...) is heavily inspired by it. In the long term, AI Services will either become a canonical plugin, or its features will be ported into new canonical plugins.
github.com
GitHub - WordPress/php-ai-client
Contribute to WordPress/php-ai-client development by creating an account on GitHub.
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Felix Arntz @felixarntz.bsky.social · 29/07/2025
AI Services 0.7.0 brings enhanced support for the Chrome and Edge built-in models, which run directly in your browser. You can now load the plugin's JS API in a "client-side-only" mode, suitable for enabling AI features for any visitors without incurring cost, privacy-friendly.
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Felix Arntz @felixarntz.bsky.social · 29/07/2025
For developers, the 0.7.0 release might well be the biggest one yet, with tons of API enhancements to simplify implementing support for additional providers. And if your plugin's AI features rely on AI Services, your users have access to the new built-in providers right away.
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Felix Arntz @felixarntz.bsky.social · 29/07/2025
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...
wordpress.org
AI Services
Makes AI centrally available in WordPress, whether via PHP, REST API, JavaScript, or WP-CLI - for any provider.
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Felix Arntz @felixarntz.bsky.social · 21/07/2025
Tune in this Wednesday to learn more about the latest WordPress Core Performance Team efforts, including the View Transitions plugin!
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Felix Arntz @felixarntz.bsky.social · 17/07/2025
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...
felix-arntz.me
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.
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Reposted by Felix Arntz
Jeffrey B. Paul @jeffpaul.com · 17/07/2025
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:
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Felix Arntz @felixarntz.bsky.social · 17/07/2025
For me personally, my main focus will be building the PHP AI Client SDK, a provider agnostic SDK to communicate with any generative AI models of various capabilities using a uniform API. Learn more about that project here: make.wordpress.org/ai/2025/07/1...
make.wordpress.org
PHP AI Client
The PHP AI Client SDK provides a unified interface for AI integration across all providers – users choose their preferred AI service while developers focus on building features, not infrastru…
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Felix Arntz @felixarntz.bsky.social · 17/07/2025
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...
make.wordpress.org
AI Building Blocks for WordPress
We’re creating technical Building Blocks that will allow users and developers to create powerful AI implementations within WordPress.
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Felix Arntz @felixarntz.bsky.social · 16/07/2025
Then you got nothing to worry about with this plugin :)
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Felix Arntz @felixarntz.bsky.social · 15/07/2025
I'm not familiar with barba.js. This plugin uses the browser built-in View Transitions API, in other words it's likely far lighter than any framework or SDK could be. See developer.chrome.com/docs/web-pla... for more information.
developer.chrome.com
Cross-document view transitions for multi-page applications  |  View Transitions  |  Chrome for Developers
Get started with cross-document view transitions for use in your multi-page application (MPA).
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Felix Arntz @felixarntz.bsky.social · 15/07/2025
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...
wordpress.org
View Transitions
Adds smooth transitions between navigations to your WordPress site.
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Felix Arntz @felixarntz.bsky.social · 29/06/2025
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...
felix-arntz.me
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.
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Felix Arntz @felixarntz.bsky.social · 23/06/2025
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...
Felix Arntz speaker photo, with label: Panel Discussion - The Future of WordPress: How AI is Transforming Builders, Workflows & Site Creation
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Felix Arntz @felixarntz.bsky.social · 19/06/2025
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...
felix-arntz.me
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.
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Felix Arntz @felixarntz.bsky.social · 18/06/2025
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.
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Felix Arntz @felixarntz.bsky.social · 17/06/2025
New profile picture (about time)! Thanks to @nilovelez.com for capturing me at #WCEU!
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Felix Arntz @felixarntz.bsky.social · 05/06/2025
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.
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Felix Arntz @felixarntz.bsky.social · 05/06/2025
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...
felix-arntz.me
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.
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Reposted by Felix Arntz
Paul Halfpenny @paulhalfpenny.com · 28/05/2025
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.agency
Filter AI WordPress Plugin - Filter
Filter AI brings the power of AI to WordPress, streamlining content creation and enhancing your editorial workflow.
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Felix Arntz @felixarntz.bsky.social · 22/05/2025
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...
felix-arntz.me
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.
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Felix Arntz @felixarntz.bsky.social · 08/05/2025
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...
felix-arntz.me
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...
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Reposted by Felix Arntz
Seth Rubenstein @sethrubenstein.info · 29/04/2025
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.
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Felix Arntz @felixarntz.bsky.social · 29/04/2025
Love it, I'm excited to see real use-cases like this! Also neat that you implemented the modal to select from a few alternatives.
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Felix Arntz @felixarntz.bsky.social · 23/04/2025
Not in the mood for reading docs? No problem! Just activate the plugin, explore its capabilities in the AI Playground UI, then copy and paste the code that allows you to do the same thing in your plugin. ✨
Screenshot of the AI Playground code modal showing PHP and JavaScript code for the current prompt and configuration, for you to copy and paste into your own plugin's codebase
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Felix Arntz @felixarntz.bsky.social · 23/04/2025
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/ 🎓
felixarntz.github.io
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.
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Reposted by Felix Arntz
Pascal Birchler @swissspidy.bsky.social · 23/04/2025
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 🚀
pascalbirchler.com
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.
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Felix Arntz @felixarntz.bsky.social · 22/04/2025
That's awesome, thank you for sharing! I'm excited to take a look, so please let me know. Happy to advise in case of any questions.
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Felix Arntz @felixarntz.bsky.social · 22/04/2025
Accompanying this release is a new documentation site explaining the APIs and how to use them in detail: felixarntz.github.io/ai-services/ Try the latest version in your WordPress Dashboard: Go to Add Plugin, search for "ai services abstraction", then look for the blue robot icon.
felixarntz.github.io
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.
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Felix Arntz @felixarntz.bsky.social · 22/04/2025
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...
wordpress.org
AI Services
Makes AI centrally available in WordPress, whether via PHP, REST API, JavaScript, or WP-CLI - for any provider.
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Felix Arntz @felixarntz.bsky.social · 18/04/2025
At the moment this is only supported by a recent experimental Gemini 2.0 Flash model, and now you'll be able to use it in WordPress. Learn more: developers.googleblog.com/en/experimen... Keep an eye out for the AI Services plugin version 0.6.0, coming early next week.
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Felix Arntz @felixarntz.bsky.social · 18/04/2025
A revolutionary new AI capability is coming to the AI Services plugin next week: Multimodal output lets you create both text and images using a single model, and it's also way better than regular image models at taking an input image and altering it based on your prompts.
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Felix Arntz @felixarntz.bsky.social · 16/04/2025
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...
make.wordpress.org
WordPress 6.8 performance improvements
This post is the latest in a series of updates focused on the performance improvements of major releases (see 6.7, 6.6, 6.5, 6.4, 6.3, and 6.2). WordPress 6.8, “Cecil…
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