Write repeatability prompts that expose one failure mode at a time.

Start with a low-ambiguity baseline

Specify one subject, one setting, one ordered action, one camera behavior, a short timing envelope, and explicit exclusions. Avoid brand facts, small text, complex crowds, and multiple transformations in the baseline unless one of those is the variable under test. The baseline should reveal whether the core instruction survives repeated attempts before adding production complexity.

Create orthogonal stress prompts

Add separate trials for identity under camera movement, object geometry during interaction, action order across cuts, dialogue and mouth timing, stereo sound placement, and text persistence. Change only the relevant constraint between trials. Label every prompt version so a reviewer can connect a failure to the instruction change instead of comparing unrelated creative scenes.

• Identity trial
• Motion and geometry trial
• Timing and audio trial
• Text and delivery trial

Pair each prompt with an observation form

Attach the required invariants, acceptable deviations, attempt budget, and rejection conditions directly to the prompt. Capture outputs in generation order and avoid choosing a favorite before scoring. If the language itself is ambiguous, revise the test contract and begin a new version; do not count a changed prompt as another attempt in the original series.