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Generate short videos from a text prompt or from still images using ByteDance Seedance on Volcengine Ark.
Passed 5 of 13 test cases with the skill, and 5 of 13 without it.
and 1 more in the full report
3 fixed6 passed either way11 still failing3 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 3 test cases the skill fixed. Same model, same prompt, with and without the skill.
I want all video generation commands in my shell session to default to the mini model tier without adding --model mini to every invocation. Which environment variable should I export?
| Checked | Without skill | With skill |
|---|---|---|
| Identifies SEEDANCE_MODEL environment variable. | Missed | Passed |
The instructions your model reads when the skill loads.
Turn a text prompt — optionally anchored by a first frame, a last frame, or reference
images — into a short video. The script submits an async task, polls until it finishes,
and downloads the .mp4. Generation takes a few minutes, so set expectations and let it run.
uv available (self-contained uv run script; deps install on first run).
A Volcengine Ark key. Resolved progressively, so any one works:
export ARK_API_KEY=... in the shell, or.env file (checked in order: $PWD/.env, then ${CLAUDE_PLUGIN_ROOT}/.env), or--api-key ... on the command line.CRITICAL -- Never paste the API key into chat or commit a .env. If the key is missing,
the script prints exactly how to set it — relay that instead of guessing.
--first-frame img.png. The still becomes the opening frame and
the model adds motion. This is the right mode for animating a storyboard panel or product render.--first-frame a.png and --last-frame b.png to interpolate
a transition between two stills.--image path:reference_image (repeatable) to steer style/composition.If the user attached an image, default to image-to-video unless they clearly want a fresh scene.
Read references/prompting.md before writing a non-trivial prompt. Seedance responds well to
prompts that describe the shot over time (beats like [0s-2s] … [2s-5s] …), the camera move,
and what must stay fixed. For image-to-video, explicitly state which traits of the source to
preserve (style, framing, colors) so the clip does not drift.
Invoke it directly (the shebang runs it through uv):
test cases passed, vs 5 / 13 without
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