Red Green Refactor Is OP With Claude Code

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• TDD’s red-green-refactor cycle produces substantially better results from Claude Code than unconstrained implementation: the failing test is an unambiguous success criterion the agent can verify autonomously.
• AI agents are good at satisfying explicit constraints and bad at inferring implicit ones — TDD externalises the implicit into a test, eliminating a major source of drift.
• The “refactor” phase is where agent output most often degrades; human review at that stage is disproportionately valuable.