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Public story · 2026-02-26 · source-backed
Simon Willison released the first two chapters of a living guide to Agentic Engineering Patterns. Chapter 1: "Writing code is cheap now." Chapter 2: "Use red/green TDD" -- the "four-word prompt that unlocks substantial engineering discipline." Martin Fowler linked to it within 48 hours, calling Willison "one of my most reliable sources for information about LLMs and programming" and explicitly endorsing the Red/Green TDD pattern. This is becoming the authoritative practitioner reference.
Each link below shares sources, entities, or timing with this story.
Simon Willison launched a multi-chapter guide collecting practical patterns for working with coding agents. Chapters include "Writing code is cheap now," "First run the tests," "Red/green TDD," "Hoard things you know how to do," and the new "Interactive Explanations" chapter f...
Third chapter of Willison's evolving Agentic Engineering Patterns guide (endorsed by Martin Fowler). Core technique: maintain a personal solutions library and feed proven examples to agents for recombination. This joins Red/Green TDD and "Writing code is cheap now" as the thre...
The fourth chapter of Willison's Agentic Engineering Patterns guide addresses cognitive debt by having agents build interactive animated explanations of their own code. Martin Fowler endorsed the full guide. The methodology is now four chapters: (1) code is cheap, (2) red/gree...
Martin Fowler endorses Willison's Agentic Engineering Patterns — When Fowler stamps a methodology, enterprise follows. Specifically endorses Red/Green TDD. Thoughtworks formalizing "knowledge priming as infrastructure." (martinfowler.com) ---
Fowler's daily fragment endorsed Willison's guide, specifically the Red/Green TDD pattern. Called him "one of my most reliable sources for information about LLMs and programming." Distinguished vibe coding from agentic engineering. His Thoughtworks team is formalizing "knowled...
The crystallizing reference for agentic engineering. Four chapters: "Code is cheap now," "Red/Green TDD," "Hoard things you know how to do," and the new "Interactive Explanations" — having agents build animated visualizations to fight cognitive debt. Endorsed by Martin Fowler.
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