Joost de Valk

Investor @emiliacapital • Founder @Yoast • Open Source aficionado currently playing with Astro & EmDash • Husband to Marieke • Father of 4 • 🇪🇺🇳🇱🇮🇹️️

[Joost de Valk @jdevalk]

This is huge! Congrats to the Tailwind team and @adamwathan

[Adam Wathan @adamwathan]

Big one today — Tailwind is joining Shopify 🛍️

[Joost de Valk @jdevalk]

@addyosmani @AnthropicAI Oh that's good news for all of us! Congrats!!

[Joost de Valk @jdevalk]

@markjaquith Why IMAP and not JMAP?

[Joost de Valk @jdevalk]

The kind of story you can't make up or people would call it "overly romantic".

Perr Schuurs, injured for three years, make his comeback as a professional football player, and scores a goal with his first touch. All at my favorite team #NEC

[ESPN NL @ESPNnl]

It wasn’t just a dream, Perr 🥹

[Joost de Valk @jdevalk]

@purnendudash_in I think the creepy crawlers reference to the TVs being used as crawlers is of far more societal impact than even that 20% capacity.

[Joost de Valk @jdevalk]

https://t.co/vrVPKw7iAo

This is terrifying. And hilarious… but mostly terrifying.

[Joost de Valk @jdevalk]

@SanderJanssen95 Weet jij wanneer de speeldata nu bekend worden? Begreep ik goed dat dat zondag is?

[Joost de Valk @jdevalk]

I fear @OliverSild is right. And I’m not sure how we deal with that as a community. How _any_ open source community deals with this pressure.

The pressure being put on the commons is insane, and in many cases, not enough money is flowing into them to maintain them well.

[Oliver Sild @OliverSild]

I predict it's a matter of time when a 0 day will be dropped in WordPress core (vulnerability disclosed before core releases a fix for it). I already see people publishing the vulnerability reports they have sent via HackerOne to WordPress core, but which have not been fixed for years and taking into account all the AI built chains we're seeing, pretty sure some of them which were considered "meh" to fix will end up being something with a very real impact. There are a lot more security researchers now who can report pretty severe stuff thanks to AI and if they just keep getting responses that the issues are duplicates without seeing fixes going out they will just drop them publicly (we're already seeing this with plugins and with software from other ecosystems).

[Joost de Valk @jdevalk]

@slowpokedj Was een toppot.

[Joost de Valk @jdevalk]

@SanderJanssen95 @bartwolf1 Ben wel benieuwd naar je speculatie.

[Joost de Valk @jdevalk]

MCP 2026-07-28 shipped today: no more handshake, no more sessions.

That's how static sites already served MCP; the spec just caught up. What changed in my endpoint, why tools/list can now live on the CDN, and how my agent skills now ship over MCP:

https://t.co/ohAdQB8Wxq

[Joost de Valk @jdevalk]

@ClaudeDevs Someone needs to update https://t.co/Y4amuwUkso - it still reads

The current protocol version is 2025-11-25.

[Joost de Valk @jdevalk]

@remkusdevries Those don’t exist 🤷🏻‍♂️

[Joost de Valk @jdevalk]

@0xseph It costs about 5 minutes to add to most sites. If not for yours, that’s your problem to begin with.

[Joost de Valk @jdevalk]

For some of the work I’m doing I had to write down where I think websites are headed and what that means for SEO, and since I did, I decided to make a blog post out of it too:

https://t.co/HStKQZXtuL

[Joost de Valk @jdevalk]

This... Is probably the best explanation of what SEOs call "keyword research". Write in the language your customers use.

There is the risk of navelgazing in this, so I would add one thing: talk to 100 or so prospective customers that didn't buy your product yet too.

[Jason Fried @jasonfried]

Every marketing team should do this simple test.

At random, ask 100 of your existing customers to describe your product in their own words. No leading the witness.

Then look at how you describe your product on your site.

Don’t dismiss obvious differences by telling yourself, “They basically mean the same thing we do.”

Really look at the specific words. Really consider exactly what they’re saying and how they’re saying it. Compare that directly with the words you’re using, the descriptions you’re presenting, the picture you’re painting.

Then stare at the Grand Canyon.

[Joost de Valk @jdevalk]

@VeryWellVersed Yeah it's annoying. Something something open (and enforced) standards.

[Joost de Valk @jdevalk]

When Dries wrote about License-only versus Stewarded Open Source, I knew I had to write a follow-on to that:

https://t.co/V3o0CXpIbf

[Joost de Valk @jdevalk]

I wrote about this in the context of hosts, but this is happening everywhere and much more of a problem than people realize:

https://t.co/WvhVfjVvn6

[JH Scherck @JHTScherck]

Do I know anyone @Zendesk? If so, can someone at ZD explain why their hosted help center blocks Claude with a 403 status code? It makes it harder to have agents figure out how to solve problems with third party products. cc @DanoKwan *please* consider having your team fix this.