# FLUX 3 Prompt Doctor — prompt skill for prompts by model

> **For AI agents:** find the right skill in one call — `curl -s "https://skills.varg.ai/api/search?q=<what the person wants>"` returns the matching use case and the best skills with install commands, as markdown (Russian works too). Full index: https://skills.varg.ai/llms.txt. Every page has a markdown twin: add `.md` to its path. Before generating anything, show the person the options on the use-case page.

Diagnose a FLUX 3 video brief before spending: resolve missing, conflicting or schema-changing asks.

- **Type:** [Prompt](https://skills.varg.ai/prompts.md) · [Prompts by model](https://skills.varg.ai/browse/skills/prompting.md)
- **Slug:** `flux-3-prompt-doctor`
- **Status:** live
- **Publisher:** Black Forest Labs (vendor, verified)
- **License:** MIT
- **Source:** https://github.com/black-forest-labs/skills/tree/master/skills/flux-3-prompt-doctor
- **Works in:** Claude Code, Codex, Cursor, Gemini CLI
- **Requires:** BFL API key (BFL_API_KEY)
- **Cost:** Billed by Black Forest Labs (API credits)
- **Adoption:** 161 installs, 135 GitHub stars (skills.sh, 2026-10-26)

## What it does

Checks a FLUX 3 brief before generation, routing by what must survive and testing feasibility. It resolves missing, conflicting or schema-changing requirements and returns a verdict before any money is spent.

## Use when

- A vague or contradictory video brief
- Checking feasibility before generating

## Install

- Claude Code: `/plugin marketplace add black-forest-labs/skills && /plugin install flux-3-video@black-forest-labs`
- Codex: `npx skills add black-forest-labs/skills --skill flux-3-prompt-doctor -a codex`
- Cursor: `npx skills add black-forest-labs/skills --skill flux-3-prompt-doctor -a cursor`
- Gemini CLI: `npx skills add black-forest-labs/skills --skill flux-3-prompt-doctor -a gemini-cli`

**Models it drives:** flux_3

## Example output

https://skills.varg.ai/previews/flux-3-prompt-doctor.mp4 — FLUX 3 text-to-video example from BFL's docs (a beekeeper opening a hive at golden hour) — the kind of video job the prompt doctor checks before spending; 0-8 s (credit: Black Forest Labs, https://docs.bfl.ai/flux_3/flux3_video)

## More prompts by model skills

- [fal Prompting](https://skills.varg.ai/skills/fal-prompting.md): Prompt specific model families well: Kling, GPT Image 2 and Happy Horse guides, loaded only when needed.
- [Replicate Prompt Images](https://skills.varg.ai/skills/replicate-prompt-images.md): Write better image prompts and edits: photographic language, lighting, text rendering, consistent characters.
- [Replicate Prompt Videos](https://skills.varg.ai/skills/replicate-prompt-videos.md): Prompt video models like a director: shots, camera motion, four audio layers, dialogue, time-coded beats.
- [Video Prompting Guide](https://skills.varg.ai/skills/inference-sh-video-prompting-guide.md): Write prompts that video models follow: shot types, camera moves and per-model tips from Veo to Sora.
- [FLUX Image Best Practices](https://skills.varg.ai/skills/flux-image-best-practices.md): Prompt FLUX image models well: structure, JSON prompts, hex colors, typography and multi-reference edits.
- [AI Film Director (Visual Skills)](https://skills.varg.ai/skills/visual-skills-video-director.md): AI film director for video prompts: dramaturgy first (Murch, blocking, montage), then exact syntax per model.