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seedance_generate_video

Generate AI video from a text description. Describe the scene, motion, style, and mood to create high-quality video.

Instructions

Generate AI video from a text prompt using ByteDance Seedance.

This is the simplest way to create video - just describe what you want and
Seedance will generate a high-quality AI video.

Use this when:
- You want to create a video from a text description
- You don't have reference images
- You want quick text-to-video generation

For using reference images (first/last frame, reference), use
seedance_generate_video_from_image instead.

Returns:
    Task ID and generated video information including URLs and metadata.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
promptYesDescription of the video to generate. Max 1000 characters. Be descriptive about the scene, motion, style, and mood. You can also include inline parameters like '--rs 720p --rt 16:9 --dur 5'. Examples: 'A cat walking through a garden with butterflies', 'Cinematic aerial shot of mountains at sunset'
modelNoModel version to use. Options: 'doubao-seedance-2-0-260128' (latest generation quality model), 'doubao-seedance-2-0-fast-260128' (latest generation fast model), 'doubao-seedance-1-5-pro-251215' (newest flagship, supports audio), 'doubao-seedance-1-0-pro-250528' (standard, default), 'doubao-seedance-1-0-pro-fast-251015' (fast, cost-optimized), 'doubao-seedance-1-0-lite-t2v-250428' (lightweight text-to-video), 'doubao-seedance-1-0-lite-i2v-250428' (lightweight image-to-video).doubao-seedance-1-0-pro-250528
resolutionNoVideo resolution. Options: '480p', '720p' (default), '1080p'.720p
ratioNoVideo aspect ratio. Options: '16:9' (landscape, default), '9:16' (portrait), '1:1' (square), '4:3', '3:4', '21:9' (ultrawide), 'adaptive'.16:9
durationNoVideo duration in seconds. Range: 2-12. Default is 5. Mutually exclusive with 'frames'.
framesNoFrame count for the generated video. Must satisfy 25+4n (e.g. 29, 33, 37, ..., 289). Mutually exclusive with 'duration'.
generate_audioNoIf true, generate audio along with the video. Only supported by 'doubao-seedance-1-5-pro-251215' model. Approximately doubles the cost. Default is false.
service_tierNoService tier. 'default' for standard processing, 'flex' for 50%% cheaper but slower processing. Default is 'default'.default
seedNoRandom seed for reproducible generation. Range: -1 to 4294967295. Use -1 for random. Default is -1.
camera_fixedNoIf true, keep the camera fixed during generation. Default is false.
watermarkNoIf true, add a watermark to the video. Default is false.
return_last_frameNoIf true, also return the last frame of the generated video as an image URL. Useful for video extension workflows. Default is false.
callback_urlNoWebhook callback URL for asynchronous notifications. When provided, the API returns immediately with a task_id and calls this URL when the video is generated.
execution_expires_afterNoTask timeout threshold in seconds. Default is 172800 (48 hours).

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations provided, so the description carries full burden. It mentions return type (Task ID and video info) but does not disclose the async nature (implied by callback_url parameter) or other behavioral traits like rate limits, cost specifics, or error handling. The description adds moderate context beyond the schema.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is concise, with a clear purpose statement, bullet-point usage guidelines, and a return summary. It avoids unnecessary detail. Slightly longer due to examples, but still well-structured.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

With 14 parameters all documented in schema and an output schema present (implied), the description provides a high-level summary that helps the agent select the tool. It covers the essential context (purpose, when to use, return type) without needing to repeat schema details.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so baseline is 3. The description adds high-level context for model selection (e.g., 'standard, fast, flash') and the use of duration vs frames, but these are already detailed in parameter descriptions. No substantial additional meaning beyond the schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description states 'Generate AI video from a text prompt using ByteDance Seedance', providing a specific verb and resource. It distinguishes from the sibling tool seedance_generate_video_from_image by explicitly noting that the image-based variant is for reference images.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Includes a 'Use this when:' section with three clear bullet points (text description, no reference images, quick generation) and explicitly directs to seedance_generate_video_from_image for reference images, providing an alternative.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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