black-forest-labs
Registry indexed
flux-3-generate
Use when submitting or polling a FLUX 3 video API job. Also covers drafts, downloads, and technical validation.
Registry indexed
Use when submitting or polling a FLUX 3 video API job. Also covers drafts, downloads, and technical validation.
Use when submitting or polling a FLUX 3 video API job. Also covers drafts, downloads, and technical validation.
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Execute a ready plan through the asynchronous API, preserve expiring artifacts, and
verify the MP4. Read the FLUX 3 API reference before building a
request; it is authoritative wherever this skill disagrees. Authenticate with the
x-key header from BFL_API_KEY; check the variable exists without printing it, and
never put keys in prompts, logs, or saved request bodies.
Every request names its mode (required, exact strings) and carries the matching media
field:
mode | Media field | What the model does |
|---|---|---|
t2v | none | Generates the clip from your text alone |
i2v | keyframes (required) | Puts your images on screen, pixel for pixel, as pinned frames |
v2v | start_video (required) | Continues from the final frames of your clip |
draft_enhance | draft_cache (required) | Replays a cached draft at full quality; accepts no other fields, not even prompt |
422 naming it
(Extra inputs are not permitted). A missing required field 422s the same way.aspect_ratio (auto, 21:9, 2:1, 16:9,
4:3, 1:1, 3:4, 9:16), duration (integer 5-20 or "auto"), resolution
(hd or fhd), generate_audio (bool), draft (bool), version.[seconds, image] timestamped keyframes, need
an integer duration. Media travels as a public URL or inline base64; keyframe
images are at least 256x256.id and polling_url with the
secret-free request.x-key header, following
redirects. Planning time on a complex brief is normal, not a stall. The API status
strings are exact. KEEP POLLING on Pending, Reasoning, Generating. STOP on
Ready (success) and on Error, Request Moderated, Content Moderated, or
Task not found (failures). None of these terminal statuses ever later becomes
Ready.
429 on submit means your org's concurrency ceiling is full and no task was
created. There is nothing to poll. Wait for a slot, then resubmit the same body.429 on poll means the task exists and is unaffected. Back off and keep polling
the same polling_url. Never resubmit, or you pay for a second render.503: bounded backoff.se= query parameter on the URL itself is
the authoritative expiry. Read it rather than assuming a fixed window. Video
outputs arrive in result.samples, which is a list. Draft bundles arrive in
result.draft_caches, which is also a list. The singular result.draft_cache is
the first element of that list, not the complete set. Iterate every element of both
lists and download all of them before doing anything else, recording the local path
and task ID per element. A client reading only the singular result.draft_cache key
silently drops paid artifacts that cannot be recovered once the signed URLs expire.
Save the downloaded files, plus task ID and status.Add draft: true while a concept is unproven: a fast low-step preview plus a
draft_cache costs far less than a full render. Judge a draft on event legibility,
composition, and continuity; softness is the low-step trade and resolves at full
quality. Enhance only the chosen cache (it replays the same generation, so preserve
draft-to-cache identity when several are in play).
Between reruns change one consequential dimension. After two structurally similar misses, return to the creative skill instead of accumulating adjectives.
name: flux-3-generate description: Use when submitting or polling a FLUX 3 video API job. Also covers drafts, downloads, and technical validation. metadata: author: Black Forest Labs version: "1.0.0" tags: flux, flux-3, bfl, video-api, generation, polling, drafts, qc
---
name: flux-3-generate
description: Use when submitting or polling a FLUX 3 video API job. Also covers drafts, downloads, and technical validation.
metadata:
author: Black Forest Labs
version: "1.0.0"
tags: flux, flux-3, bfl, video-api, generation, polling, drafts, qc
---
# FLUX 3 Generate
Execute a ready plan through the asynchronous API, preserve expiring artifacts, and
verify the MP4. Read the [FLUX 3 API reference](https://docs.bfl.ai) before building a
request; it is authoritative wherever this skill disagrees. Authenticate with the
`x-key` header from `BFL_API_KEY`; check the variable exists without printing it, and
never put keys in prompts, logs, or saved request bodies.
## Request shape
Every request names its `mode` (required, exact strings) and carries the matching media
field:
| `mode` | Media field | What the model does |
| --- | --- | --- |
| `t2v` | none | Generates the clip from your text alone |
| `i2v` | `keyframes` (required) | Puts your images on screen, pixel for pixel, as pinned frames |
| `v2v` | `start_video` (required) | Continues from the final frames of your clip |
| `draft_enhance` | `draft_cache` (required) | Replays a cached draft at full quality; accepts no other fields, not even `prompt` |
- The schema is strict: any field it does not know returns a `422` naming it
(`Extra inputs are not permitted`). A missing required field 422s the same way.
- Settings on the generating modes: `aspect_ratio` (`auto`, `21:9`, `2:1`, `16:9`,
`4:3`, `1:1`, `3:4`, `9:16`), `duration` (integer 5-20 or `"auto"`), `resolution`
(`hd` or `fhd`), `generate_audio` (bool), `draft` (bool), `version`.
- Constraints couple (a video input at higher resolution may cap duration): read the
reference rather than assuming fields are independent.
- Three or more bare keyframes, and all `[seconds, image]` timestamped keyframes, need
an integer `duration`. Media travels as a public URL or inline base64; keyframe
images are at least 256x256.
## Run a job
1. **Submit once.** Persist the returned task `id` and `polling_url` with the
secret-free request.
2. **Poll every 6 seconds** to a terminal state with the `x-key` header, following
redirects. Planning time on a complex brief is normal, not a stall. The API status
strings are exact. KEEP POLLING on `Pending`, `Reasoning`, `Generating`. STOP on
`Ready` (success) and on `Error`, `Request Moderated`, `Content Moderated`, or
`Task not found` (failures). None of these terminal statuses ever later becomes
`Ready`.
- `429` on submit means your org's concurrency ceiling is full and **no task was
created**. There is nothing to poll. Wait for a slot, then resubmit the same body.
- `429` on poll means the task exists and is unaffected. Back off and keep polling
the same `polling_url`. Never resubmit, or you pay for a second render.
- `503`: bounded backoff.
3. **Download immediately.** Observed signed sample and draft cache URLs expire roughly
one hour after the result is ready. The `se=` query parameter on the URL itself is
the authoritative expiry. Read it rather than assuming a fixed window. Video
outputs arrive in `result.samples`, which is a list. Draft bundles arrive in
`result.draft_caches`, which is also a list. The singular `result.draft_cache` is
the first element of that list, not the complete set. Iterate every element of both
lists and download all of them before doing anything else, recording the local path
and task ID per element. A client reading only the singular `result.draft_cache` key
silently drops paid artifacts that cannot be recovered once the signed URLs expire.
Save the downloaded files, plus task ID and status.
4. **Validate**: container decodes, duration/resolution/aspect match intent, audio
present exactly when requested. Technical validity is not creative approval; hand
review to the specialist that owns it.
## Drafts
Add `draft: true` while a concept is unproven: a fast low-step preview plus a
`draft_cache` costs far less than a full render. Judge a draft on event legibility,
composition, and continuity; softness is the low-step trade and resolves at full
quality. Enhance only the chosen cache (it replays the same generation, so preserve
draft-to-cache identity when several are in play).
Between reruns change one consequential dimension. After two structurally similar
misses, return to the creative skill instead of accumulating adjectives.
## References
- [references/api-quick-reference.md](references/api-quick-reference.md)
Skill source recorded
Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.
Review before install: Avoid automatic install
License: MIT
Listed tools are metadata hints, not tested compatibility. Agent prompts are suggested handoffs.
Check the source for dependencies, API keys and third-party costs. A public repository does not mean every service is free.
Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.
Version reported in registry metadata; check source releases before relying on it.
Quality
67/100
Promising
Trust
62/100
Sandbox only
This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.
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}Listing source
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Audit
76/100
Needs review
Copies are not installs. Installation counts require a reported successful installation; they are not a blanket quality guarantee.