Ark Seedance Video Generation

Use this skill as an execution skill for tool-using agents. The agent should run the existing script directly and complete the workflow for the user.

Core Rules

• Use only scripts/seedance-video.js for live execution.
• Do not write another script, wrapper, or replacement implementation.
• Use ARK_API_KEY only. Do not use AK/SK.
• The script must receive an explicit model through --model or payload JSON.
• Restrict model choice at the skill layer to:
  • doubao-seedance-1-0-pro-250528
  • doubao-seedance-2-0-260128
• Default model at the SOP layer: doubao-seedance-1-0-pro-250528
• For local image, video, or audio inputs, explicitly tell the user the files will be uploaded to Volcengine Ark before execution.
• Save request.json in sanitized form only. Do not persist raw Base64 media data.

Required Start

For every new generation request, the first model-facing message must:

1. List these two model IDs:
   • doubao-seedance-1-0-pro-250528
   • doubao-seedance-2-0-260128
2. Require the user to choose one before generation starts.

If the user already named one of the two approved IDs, use it and continue.

Workflow

1. Intake

Determine:

• Generation mode: text-to-video, image-to-video, video-conditioned, audio-assisted, draft-task reuse, or task management
• Whether inputs are local files or remote URLs
• Whether the user asked for ratio, duration, resolution, seed, watermark, callback, or last-frame output
• Whether the request is a new generation, inspection, re-download, list, or deletion

2. Model Gate

• If the user already selected one of the two approved models, use it.
• If not, stop and ask them to choose one after listing the two approved IDs.
• Do not start generation, task creation, or payload submission until a model is chosen.
• Always pass the selected model explicitly through --model or payload JSON.

3. Auth Check

• Require ARK_API_KEY
• If missing, stop and tell the user exactly that ARK_API_KEY is required

4. Local Media Disclosure

If the request uses --image-file, --video-file, or --audio-file:

• Tell the user those files will be sent to Volcengine Ark
• If they object, stop before execution

5. Output Location

Prefer a workspace-local structure:

• ./outputs/seedance/<job-name>/request.json
• ./outputs/seedance/<job-name>/task.json
• ./outputs/seedance/<job-name>/<downloaded-assets>

6. Command Choice

Use the existing script surface only:

• run for normal generation
• create or create --wait true only when the lifecycle requires it
• get for inspect or re-download
• list for browsing tasks
• delete for deletion
• download when assets are needed from an existing task.json

7. Flag Mapping

Map user inputs to:

• --model
• --prompt
• --image-file / --image-url
• --video-file / --video-url
• --audio-file / --audio-url
• --draft-task-id
• --resolution
• --ratio
• --duration
• --frames
• --seed
• --camera-fixed
• --watermark
• --return-last-frame
• --callback-url
• --download-dir

If the request needs unsupported advanced fields, write a JSON payload file and pass it through --payload-file.

8. Verify

After execution, verify what applies:

• final task status is succeeded
• task.json exists
• request.json exists and is sanitized
• output assets were downloaded
• last-frame asset exists when requested

9. Report

Return:

• requested task summary
• selected model ID
• command path used
• task ID when available
• output directory
• whether downloads completed
• relevant warnings or failures

Command Patterns

Use these as execution patterns:

node "./scripts/seedance-video.js" --model "<model-id>" --prompt "<prompt>" --download-dir "./outputs/seedance/run-001"

node "./scripts/seedance-video.js" --model "<model-id>" --image-file "./inputs/source.png" --prompt "<prompt>" --return-last-frame true --download-dir "./outputs/seedance/image-to-video"

node "./scripts/seedance-video.js" create --model "<model-id>" --prompt "<prompt>" --wait true --download-dir "./outputs/seedance/create-wait"

node "./scripts/seedance-video.js" get --task-id "cgt-xxxx" --download-dir "./outputs/seedance/rerun-download"

node "./scripts/seedance-video.js" --payload-file "./inputs/seedance-payload.json" --download-dir "./outputs/seedance/raw-payload"

References

Read only when needed:

• references/ark-video-api.md
• references/video-models.json
• references/video-models.md
• references/payload-patterns.md