iannuttall

name	cull-tests
description	Cull tests that do not protect behaviour. Use when the user says tests are slop, agents wrote too many tests, tests only check that text exists, or they want a suite an agent could rebuild the product against.

Cull tests

Agents pad test suites. They write tests that confirm a feature exists, that a type already proves, that a button is on the page, or that a mocked API still returns the mock. Those tests pass forever and catch nothing. This skill deletes them and keeps the ones that would still fail if someone rewrote the product from scratch.

The starting cull list is from Howaboua. The bar is Ian's: if you handed only the surviving tests to an agent and said "rebuild this," would it ship the real product?

iannuttall

AgentOS — Product Spec & Implementation Blueprint

Reconstructed from Danny Postma's talk How I Built My Own AgentOS on Claude's Agent SDK (So You Can Too) (2026). This document is both a product spec for a human and an implementation prompt for an AI coding agent. Build exactly this system. Do not invent features that are not specified here.

Role contracts and prompts in this file are reconstructed from the talk, not his verbatim files. Mark every reconstructed prompt in code comments and docs as such.

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1. Goal and non-goals

iannuttall

CSS Hot Air Balloon

A Pen by okpalan86 on CodePen.

License.

iannuttall

Flip Clock & Countdown

A Pen by Shaw on CodePen.

License.

iannuttall

Countdown Timer w/Flip Animation (WIP)

This project is part of the frontendmentor.io challenges. Adding the flip animation with the timer has proven to be a particular challenge. Although it looks to be working I am looking into a smoother animation effect to make it flip more reliably.

A Pen by Joseph Warren on CodePen.

License.