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Public story · 2026-02-24 · source-backed
Martin Fowler's 25-year Agile anniversary workshop concluded TDD "produces dramatically better results from AI coding agents" because it prevents agents from writing tests that validate their own broken implementations. The Tweag Agentic Coding Handbook now documents TDD-as-specification-language: tests become executable requirements guiding AI toward exact behavior. Additional workshop findings: when AI accelerates coding, bottlenecks shift to architecture reviews and cross-team dependencies; security remains "dangerously behind."
This is now the 5th independent source confirming TDD convergence (Register, Latent Space, Willison, builder.io, Tweag). Three words to add to every agent prompt: "Use red/green TDD." Write failing tests first, then let the agent implement.
Each link below shares sources, entities, or timing with this story.
Four independent sources published within 72 hours (The Register's Agile anniversary workshop, Latent Space's Anita framework, Simon Willison's Red/Green TDD guide, and builder.io's practical tutorial) all converging on the same conclusion: test-driven development dramatically...
Chris Lattner's CCC Review — The definitive expert assessment of AI coding capabilities. Required reading. Source: Modular Blog Boris Cherny on Lenny's Podcast — Internal Anthropic metrics, the "constraints + unlimited tokens" formula, and why "software engineer" as a title go...
Domain: prompt-engineering | Difficulty: intermediate | Source Write tests as executable specifications. Descriptive test names directly improve generation quality (the AI treats them as natural language specs). Keep scopes tight — one behavior per prompt. Multiple small TDD c...
42. Vellum AI — Opus 4.6 Benchmarks 43. Arcee AI — Trinity Large 44. arXiv — PCAS 45. arXiv — SpargeAttention2 46. arXiv — CUWM 47. arXiv — VESPO 48. arXiv — SAGE 49. The Register — TDD for AI Agents 50. Latent Space — Anita TDD 51. builder.io — TDD + AI
Willison's framing has settled into a real split: vibe coding (intent-first, accept-without-reading, optimized for speed with Lovable/Bolt/v0) versus agentic engineering (correctness-first, Claude Code/Aider/Cline under structured oversight). The tell is process. Spec-driven S...
simonwillison.net — Willison has been publishing 5-8 posts per day for the last week, and is now consolidating into a structured guide. Two chapters published: "Writing code is cheap now" explores the economic implications when implementation approaches zero marginal cost — th...
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