Story · Martin Fowler
TDD inside the agent loop - theater or actual value? (Martin Fowler)
blog post · Story page
Birgitta Böckeler at Thoughtworks ran experiments on whether telling a coding agent to use TDD changes the outcome or only imitates a favored process.
In plain words
- Thoughtworks ran experiments to see whether asking an artificial intelligence coding tool to write tests first improves its work.
- This method writes a test describing the desired behavior before creating the code that must pass it.
- The experiments compare genuine improvements with cases where the tool only copies the appearance of the process.
- The answer matters to software teams deciding whether to require test-first work from their coding tools.
Appeared in
- In LangChain's benchmark, only 7% of agent turns needed a frontier model
Aug 12, 2026 · in the sections
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