Check the selected model's prompt rules before adding more “do not” instructions. A negative instruction can be useful in a system that explicitly supports it, but another model may ignore it or interpret the named action as part of the scene. Describe the visible behavior you want, then judge the output against that behavior.
Identify which instructions the model actually accepts
Runway's Gen-4 prompting guide recommends positive phrasing and says negative prompts are unsupported for that model. This is a documented limitation of Gen-4, not a rule for every video model. Changing providers or model versions requires checking their own documentation again. An application's text box does not prove that every instruction style has a corresponding control.
Keep the original request in a production note. Separate identity, framing, action and sound requirements so that rewriting the action does not accidentally remove another approved condition. Preserve real attached references; writing a file label in a sentence does not attach that file.
Translate an exclusion into an observable action
“Do not walk away” leaves the desired performance unspecified. A more testable direction is “the person remains beside the desk and speaks toward the camera.” “No camera movement” can become “a locked camera maintains the same composition throughout.” These are proposed descriptions, not guaranteed settings.
If the requirement is an absolute production constraint, such as keeping a logo unchanged, decide whether generation is appropriate for that region. An external composite using approved artwork may offer a clearer acceptance test than repeated prompt emphasis.
A hypothetical interview-shot revision
Imagine a portrait clip where the person repeatedly turns away. The draft includes several exclusions about turning, walking and looking elsewhere. Keep the approved photograph and clip length, but test one action sentence: the person addresses the camera while standing in the established position. Keep other supported inputs unchanged.
Before viewing the result, write three checks: the face remains directed toward the intended audience, the feet stay in the designated area, and the camera preserves the background arrangement. Inspect the entire clip rather than only its opening thumbnail. This is a hypothetical comparison plan; it does not report a measured improvement or a successful generation.
Accept the behavior, not the wording
A useful result satisfies the actual brief, including identity and timing. Reject a clip that obeys the new stance but loses the approved face, creates a new prop or changes the intended scene. If multiple requirements fail, repair the most important one in a short test before expanding the prompt again.
Save the original text, rewritten text, model name and reviewed output separately. That record explains what changed and lets you return to an earlier version. For an Imagild film brief, use the controls available in the current workflow; the external model example does not establish an Imagild negative-prompt setting.
Sources
Prepared by Imagild Editorial with AI assistance and reviewed against the linked sources on October 13, 2026. Examples are hypothetical; external procedures do not establish Imagild features or guarantee results.