Maarten van 't Wout

Building - curated agent skills for Claude.
Live-building in public.

[Maarten van 't Wout @maartenvantwout]

Shipped: skillkeep-starter. Three of the agent skills I use daily, packaged free. One command, drops them into ~/.claude/skills/.

npx skillkeep-starter

Works in Claude Code, Cursor, Codex.

[plunge @xcoldplunge]

Most people still holding $eth are likely ready to go down with the ship; at least I am.

Ethereum is a bastion of freedom and self-sovereignty in an increasingly controlled world.

No amount of number go down could get me to sell. Even with most of my net worth in eth, I would hold it to literal zero.

I would rather take a chance on eth and be wrong than give up hope on the most inspiring invention of my generation.

Come zero or valhalla, I'll be here.

Believe in somΞthing.

[Maarten van 't Wout @maartenvantwout]

people compare prompts. people compare models. people don't compare skills. this is what loading the right skill actually changes.

[skillkeep_io @skillkeep]

same prompt. same model. one variable: the skill.

[Maarten van 't Wout @maartenvantwout]

Beyond excited to see over 250 downloads of the free package within the first week!🎉

[Maarten van 't Wout @maartenvantwout]

Shipped: skillkeep-starter. Three of the agent skills I use daily, packaged free. One command, drops them into ~/.claude/skills/.

npx skillkeep-starter

Works in Claude Code, Cursor, Codex.

[Maarten van 't Wout @maartenvantwout]

Repo + full skill descriptions: https://t.co/l39awoVieN

If you get "command not found: npx" the README walks through fixing it (you need Node.js — one command on macOS/Linux).

If you try it, would love to hear which one you reach for first.

[Maarten van 't Wout @maartenvantwout]

Shipped: skillkeep-starter. Three of the agent skills I use daily, packaged free. One command, drops them into ~/.claude/skills/.

npx skillkeep-starter

Works in Claude Code, Cursor, Codex.

[Maarten van 't Wout @maartenvantwout]

@huntlovell The same gap exists one layer down: the UI for picking, installing, and inspecting agent skills is still file-system-and-vibes. A few thousand people use them in production now; tooling for them looks like 2019 npm.

[Maarten van 't Wout @maartenvantwout]

@mattpocockuk The difficulty in splitting handoff is to decide when, its hard to predict how much context certain tasks will take. Since handoff also produces extra handoff text and the new agent has to read a lot of context double.
Still, very nice to do the handoff in structured way.

[Maarten van 't Wout @maartenvantwout]

@dexhorthy Doing this manually has been the single highest-leverage thing for me. Asking the agent to explain what it just did, before letting it continue. Bridges the model drift before it compounds. Surprised nobody productized it yet.

[Maarten van 't Wout @maartenvantwout]

@swyx @sama "Build a business that gets better when models get better" applies one layer down too. The skills/instruction files you ship today get sharper as Claude gets sharper. Curation is a lever, not an asset.

[Maarten van 't Wout @maartenvantwout]

@nutlope The install-command-as-CTA format is the move of 2026. Curious: did you A/B test having a link in the tweet vs install command only? Seeing some accounts get suppressed when both are in the parent tweet.

[Maarten van 't Wout @maartenvantwout]

@bcherny The discovery once /usage ships: most people will find one skill silently eating 30%+ of their tokens that they barely remember installing. Skill audit goes from "nice to have" to "monthly ritual."

[Maarten van 't Wout @maartenvantwout]

Created this. happy to answer questions.

[skillkeep_io @skillkeep]

just shipped @skillkeep — a small shop for curated, rewritten agent skills

picked the proven ones from open-source (mattpocock, obra, coreyhaines + more), rewrote each through a 5-pass house standard, bundled by role

bundles €24, individuals €7
https://t.co/cBzccDHgod

[Maarten van 't Wout @maartenvantwout]

@VitalikButerin @0xdasha Vitalik for pres!

[Maarten van 't Wout @maartenvantwout]

@brankopetric00 Always go for fastest mvp option!

[Maarten van 't Wout @maartenvantwout]

@iamcfw What’s the show?

[Maarten van 't Wout @maartenvantwout]

@Crypto_Pranjal @cascade_xyz So you have a code, I would like to try Cascade!

[Jarrod Watts @jarrodwatts]

Ethereum’s next major upgrade, “Fusaka”, goes live in less than 48 hours.

I read all 13 EIPs being included so you don’t have to.

So, here are 13 tweets (with diagrams) to explain the 13 upgrades in simple terms: 🧵

[Maarten van 't Wout @maartenvantwout]

@Kamau266 He is 40, 2025-40 early 90s?

[Maarten van 't Wout @maartenvantwout]

@wesbos @ThePrimeagen What’s the base case?

[Maarten van 't Wout @maartenvantwout]

@chrisdior777 Patrick