Link: Writing about Agentic Engineering Patterns via Simon Willison

Based on his experiences with AI-assisted programming, Simon Willison has started collecting “Agentic Engineering Patterns” (building software using coding agents that can both generate and execute code) into a guide of evergreen blog posts that he plans to update over time.

I published the first two chapters today:

• Writing code is cheap now talks about the central challenge of agentic engineering: the cost to churn out initial working code has dropped to almost nothing, how does that impact our existing intuitions about how we work, both individually and as a team?
• Red/green TDD describes how test-first development helps agents write more succinct and reliable code with minimal extra prompting.

I hope to add more chapters at a rate of 1-2 a week. I don’t really know when I’ll stop, there’s a lot to cover!

Via: https://simonwillison.net/2026/Feb/23/agentic-engineering-patterns/