The most important thing in healthtech
This morning I stumbled upon an old document which was meant to be a published article. It is more than a couple of years old, but has aged pretty m…
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Work-in-progress updates on my new book, Testing Rails from Scratch
Hello! It has been a couple of months since I announced my latest project, Testing Rails from Scratch: A practical, (mostly) out-of-the-box approach…
A Flaky Test Is a Corrupted Reward Signal
Originally published at tddbuddy.com . Related reading: Agents Should Do TDD names why faithful execution of the loop matters; Your Test Suite Is Yo…
Your AI Coding Assistant Has No Memory of Why
A pull request lands. Two approvals, tests green, CI blue. It ships on a Tuesday. Three weeks later there's an incident. Somebody opens the file and…
Where the Review Point Moved
Originally published at tddbuddy.com . Reviewing the diff is now harmful, not just insufficient. This is the first post in a two-part series, "The P…
Lesson 1 - TDD with AI: getting tests that hold up when the agent writes them
I let the agent write the tests as it built the features. They passed. I ran them, tested by hand, everything green, let it commit. For a while that…
World-Building Is the Test Discipline Agents Need
Originally published at tddbuddy.com . Related reading: The Bar for TDD Just Moved names the floor; TDD Already Does BDD, Without the Gherkin names…
Agents Amplify Whatever Vocabulary They Find
Originally published at tddbuddy.com . This is part 2 of the "Vocabulary Is the Product" series. Part 1, The Hidden Output of TDD Was Never Code , a…
I Built a Research Memory Agent with Cognee—Five API Breaks, One Knowledge Graph, Seven Days
I applied strict TDD to build a Cognee knowledge graph agent — here is every upstream API break I hit and how I fixed it What I Built ChronoScholar…
I Made My AI Rules Self-Verifiable — Here's How
The problem wasn't that my rules were bad. The problem was I had no idea if they were being followed. I had 15 rules for my AI assistant. "Think bef…
Tests Pass, Design Breaks: Why TDD Can't Hold the Line on Design Intent
There is a popular misconception that if you do TDD, your design also stays correct. That if the tests pass, quality is guaranteed. In AI-assisted d…
The Saff Squeeze
From time to time, we encounter bugs in the software systems that we work on. That’s part of the life as a software developer. Often, we don’t know…
It's Time We All Eat some more Cucumber!
Everyone's writing specs for AI now. We hand the model a markdown file, tell it what we want, and hope it builds the right thing. It mostly works —…
Testing Discipline: A Beginner's Guide
Image by upklyak on Magnific Run an application. Click a few buttons. If the terminal doesn't have errors, then everything is working. Right? What's…
Harness Engineering: The 'New Software' in the AI Era?
With the massive AI boom we are experiencing, I started writing an article about testing. In the midst of my research, I began studying Harness Engi…
How I’m Using Agent Harnesses, TDD, and the Seam Model to Improve Development in Legacy Systems
How I’m Using Agent Harnesses, TDD, and the Seam Model to Improve Development in Legacy Systems Over the past few months, I’ve been investing a lot…