AI Prompt Checker
Before VidRush spends a single credit, it reads your prompt. If the brief would produce an unwatchable video, you find out in seconds instead of an hour later.
Nothing you submit is charged until a video completes, so a blocked check costs you nothing but the time it takes to fix it.
The checker reads your prompt and nothing else. It runs the same way whether you are writing a prompt (between 200 and 10,000 characters), attaching a Custom Script, or using a Custom Voiceover.
Talking-head and avatar projects are checked differently. See Talking Head and AI Avatar.
Three possible outcomes
Every check ends in one of three states.
| Outcome | What it means | What happens next |
|---|---|---|
| Passed | Nothing to flag | You continue. No message appears. |
| Warning | Something is worth knowing, but it will still produce a video | You choose: refine your input, or proceed as-is |
| Blocked | The result would be unusable, or the content is not allowed | Generation does not start. Fix the issue and submit again. |
Each message tells you the problem in one sentence and the fix underneath it, under How to fix this. You will normally see one issue at a time, not a list.
The checker is deliberately generous. If a request is borderline, it lets it through. A block means VidRush is confident the output would be wasted, not that it is being cautious.
Requirements: minimum 200 characters, maximum 10,000 characters.
Warnings you can proceed past
These do not stop generation. They are worth reading, because most of them predict a weaker video.
| Warning | What it means | How to fix it |
|---|---|---|
| Vague or unclear prompt | There is not enough direction to build a script around | Add a specific topic, angle, or conflict |
| Low footage availability | Your topic is niche enough that suitable B-roll may be thin | Broaden the angle slightly, or add research links |
| Hyper-specific visuals | You asked for a shot that almost certainly does not exist as footage | Describe the subject rather than the exact shot |
| Fictional scenario | The premise has no real-world footage to draw on | Frame it as a documentary-style explainer |
| Partial script pasted | A stretch of finished narration is sitting inside an idea-level prompt | Move the full script to Custom Script, or trim it to a description |
| Over-specified audio or motion graphics | You are directing details the pipeline assigns itself | Leave these to your Brand Profile |
| Unfilmable or private topic | The subject is not something footage exists of | Pick a publicly documented angle |
| Over-specified editing style | The editing instructions contradict each other, or cannot be done | Simplify to the effect you actually want |
| Content and framing mismatch | The tone you asked for does not fit the subject | Align the two, or accept the result |
Three or more warnings at once become a block. Individually these issues are survivable; stacked, they reliably produce an unusable video. When this happens you are asked to simplify the request to one clear topic rather than being shown the full list.
What gets blocked
Unsupported video type. Compilations, commentary, 3D and animation, advertisements, tutorials, and fictional stories are formats the pipeline cannot produce. Documentary and Listicle are the current formats. See Choosing Format & Length.
Prohibited content. Graphic violence for entertainment and explicit sexual material are refused. Educational and documentary framing of difficult subjects is explicitly accepted, so a serious historical treatment of a violent event is fine.
Requests about VidRush internals. Asking the AI to reveal its own instructions or system configuration is not a video topic and is refused.
A finished script in the prompt field. The prompt box takes a brief, not narration. A word-for-word script pasted here fights the research and scriptwriting stages and comes out garbled. If you have a finished script, attach it properly: click + in the bottom left of the prompt window and select Custom Script.
A prompt that instructs VidRush (“Create a documentary about…”, “Open with this hook…”) is always read as a brief, however long it is, and can quote sample narration freely. Only text written to be spoken aloud to a viewer is treated as a script.
A listicle with the wrong number of items. VidRush allows roughly 1.3 list items per minute. Too many and each item gets a few seconds; too few and each is stretched past what the footage supports.
| Video length | Works well | Maximum items |
|---|---|---|
| 6–8 min | 3–10 | 10 |
| 10–12 min | 4–16 | 16 |
| 18–20 min | 6–26 | 26 |
Lengths between these tiers scale in proportion, so a 14-minute video tops out around 18 items. This only applies when you explicitly request a Top N or a numbered countdown. A general outline with several points in it is not treated as a listicle.
Language
VidRush validates prompts in English, German, and Spanish. A prompt in any other language is blocked, and you are asked to rewrite it in one of the three.
When a prompt is blocked for language, that is the only thing you are told about. Anything else wrong with the prompt surfaces on your next attempt, after you have translated it.
If your prompt language differs from your Brand Profile’s voiceover language, you get a warning, not a block. It will suggest matching the profile, and you can proceed if the mismatch is intentional. English prompts never trigger this warning, so an English prompt on a German profile passes quietly and produces a German voiceover.
→ See Multi-Language for supported video languages.
If the check itself cannot finish
Occasionally the check does not reach a verdict at all and you are told the validation service is temporarily unavailable. Nothing is known to be wrong with your prompt. Wait a moment and try generating again.
Good to know
- Blocked input costs nothing. Credits are deducted when a video completes. A prompt that never enters the pipeline never draws down your balance. See Credits & Billing.
- Silence is a pass. If no message appears after the check runs, you are clear to continue.
- Warnings are advice, not verdicts. Proceeding past one is a legitimate choice. You know your niche better than the checker does.
- A pass is not a quality guarantee. The check confirms your input can produce a video, not that it will produce a good one. → See Prompting for what makes a strong brief.