TDD inside the agent loop - theater or actual value?
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Directly addresses TDD in AI agent loops, a core interest for the reader; high community signal from Martin Fowler.
Birgitta Böckeler's exploratory evaluation of TDD within AI agent loops found no clear quality improvement over non-TDD workflows, with Opus 4.8 often ranking non-TDD solutions slightly higher in design and test quality. Using Sonnet 4.6 for generation and Opus for blind judgment across three greenfield business logic tasks, mutation scores showed no meaningful difference between approaches. The study cautions that human-centric TDD practices may not translate to agentic coding, though sample size and greenfield scope limit generalizability.