Acceptance Criteria: The Fastest Reliability Upgrade

A lot of “AI bugs” aren’t bugs.

They’re missing acceptance criteria.

If you ask an LLM to “build the feature,” it will build a feature. Usually a plausible one. Sometimes even a good one.

But plausibility is not correctness.

The fastest way to turn AI-assisted work from vibe-driven to reviewable is to write acceptance criteria before you generate anything. Not as bureaucracy. As a forcing function.

A simple acceptance-criteria pattern

  • Inputs: what the system receives
  • Outputs: what it must produce
  • Rules: what must always be true
  • Edge cases: what can’t break
  • Failure behavior: what it should do when it cannot proceed

Then give the model a job that’s actually tractable:

“Given these criteria, propose an implementation plan. Highlight any ambiguous or conflicting requirements.”

What changes immediately

  1. You catch the missing decisions while they’re still cheap.
  2. Review becomes about whether criteria are satisfied, not whether the output “looks right.”

If you want reliability, don’t start with generation.

Start with a definition of done.