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seedance_generate_video_from_image

Generate AI videos by animating images with controlled motion. Specify first/last frames or reference images to create smooth transitions and style-guided animations.

Instructions

Generate AI video using reference images with ByteDance Seedance.

This allows you to control the video by specifying first frame, last frame,
or reference images. Seedance will generate smooth motion based on the inputs.

Use this when:
- You have a specific image you want to animate
- You want to create a video transition between two images
- You need style guidance from reference images
- You need precise control over the video's visual content

Note: reference_image_urls cannot be combined with first_frame_url/last_frame_url.
At least one image input must be provided.

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

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
promptYesDescription of the video motion and content. Describe what should happen in the video, how objects should move, what transitions to include.
first_frame_urlNoURL of the image to use as the first frame of the video. The video will animate from this image. Supports https:// URLs or base64 data:image/... URIs.
last_frame_urlNoURL of the image to use as the last frame of the video. The video will animate towards this image. Supports https:// URLs or base64 data:image/... URIs.
reference_image_urlsNoList of reference image URLs for style/content guidance. These images influence the look but are not used as frames. Cannot be combined with first_frame_url or last_frame_url.
modelNoModel version to use. For image-to-video, consider 'doubao-seedance-1-0-lite-i2v-250428' for lightweight I2V, or any Pro model for higher quality.doubao-seedance-1-0-pro-250528
resolutionNoVideo resolution. Options: '480p', '720p', '1080p'.720p
ratioNoVideo aspect ratio. Use 'adaptive' to match your input image ratio.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. Only supported by 1.5 Pro model. Default is false.
service_tierNoService tier. 'default' or 'flex' (50%% cheaper). Default is 'default'.default
seedNoRandom seed. -1 for random. Default is -1.
return_last_frameNoIf true, return the last frame of the generated video. Default is false.
callback_urlNoWebhook callback URL for asynchronous notifications.
execution_expires_afterNoTask timeout threshold in seconds. Default is 172800 (48 hours).

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior4/5

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

Discloses smooth motion generation, mutual exclusivity constraints, and Task ID return (implying async), though could explicitly state polling requirement.

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

Conciseness5/5

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

Well-structured with front-loaded purpose, bulleted usage guidelines, and constraint notes; no filler content.

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?

Adequate for 15-parameter complexity; covers key constraints and return values, though could briefly mention async workflow given the Task ID return.

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

Parameters4/5

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

Adds crucial logical constraint beyond 100% schema coverage: 'reference_image_urls cannot be combined with first_frame_url/last_frame_url' and 'at least one image input must be provided'.

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?

Specific verb (Generate) + resource (AI video using reference images), clearly distinguishes from text-to-video sibling by emphasizing frame/reference image control.

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?

Explicit 'Use this when:' section with 4 specific scenarios and a constraint note clarifying mutual exclusivity of parameter groups.

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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