edd
EDD — Eval-Driven Development
TDD is for code. EDD is for context.
Write behavioral assertions about how your agent should behave. Engineer context until assertions pass. Never ship a harness change without evidence it helped.
The Boundary Rule
Will this context/prompt run more than ~20 times? → Use EDD.
Still figuring out what "good" means? → Don't use it yet. Explore first.
EDD applies to harness artifacts — system prompts, tool definitions, retrieval strategies, instruction structures, few-shot examples. It does NOT apply to feature code (use TDD) or one-off prompts (use your eyes).
When It Shines
- Iterating on a reusable harness — every change validated, regressions caught
- "It used to work" — diff scores against last known-good state
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