Seedance 2.0 video generator

Generate Seedance 2.0 videos through WeryAI with one focused skill: text-to-video, image-to-video, multi-image video, and first-frame/last-frame transition control. This skill is intentionally strict about secret declaration and input safety: the only runtime secret is WERYAI_API_KEY, and reference media must be public https URLs rather than ad-hoc local uploads.

Dependencies: scripts/video_gen.js in this directory + WERYAI_API_KEY + Node.js 18+. No other Cursor skills are required.

Authentication and first-time setup

Before the first real generation run:

1. Create a WeryAI account.
2. Open the API key page at https://www.weryai.com/api/keys.
3. Create a new API key and copy the secret value.
4. Add it to the required environment variable WERYAI_API_KEY.
5. Make sure the WeryAI account has available balance or credits before paid generation.

OpenClaw-friendly setup

• This skill already declares WERYAI_API_KEY in metadata.openclaw.requires.env and primaryEnv.
• After installation, if the installer or runtime asks for required environment variables, paste the key into WERYAI_API_KEY.
• If you are configuring the runtime manually, export it before running commands:

export WERYAI_API_KEY="your_api_key_here"

Quick verification

Use one safe check before the first paid run:

node {baseDir}/scripts/video_gen.js models --mode text_to_video
node {baseDir}/scripts/video_gen.js wait --json '{"prompt":"A glowing koi swims through ink clouds","duration":5}' --dry-run

• models confirms that the key is configured and the models endpoint is reachable.
• --dry-run confirms the request shape locally without spending credits.
• Real wait or submit-* commands still require available WeryAI balance.

Quick summary

• Main jobs: Seedance 2.0 text-to-video, single-image animation, multi-image video, start/end-frame transition video
• Main inputs: prompt, image, images, first_frame, last_frame, last_image
• Main outputs: taskId, videos, task status, model capability checks
• Main trust signals: declared WERYAI_API_KEY, no local-file upload requirement, dry-run support, explicit paid-task warning

Example prompts

• Generate a Seedance 2.0 text-to-video clip: a silver train exits a tunnel into sunrise mist, 9:16 vertical
• Animate this HTTPS portrait with Seedance 2.0 image-to-video and keep the face consistent
• Turn these three storyboard images into one coherent product reveal video with consistent lighting
• Use these first and last frames to generate a smooth transition video with the same character
• Migrate this WaveSpeed Seedance flow that uses image plus last_image into the WeryAI version

Prerequisites

• WERYAI_API_KEY must be set before running video_gen.js.
• Node.js 18+ is required.
• image, images, first_frame, last_frame, and last_image inputs must be public https URLs. Do not pass local files.
• Every real wait or submit-* run creates a paid WeryAI task.

Security, secrets, and API hosts

• WERYAI_API_KEY: Treat it as a secret. Configure it only in the runtime environment; never write the secret value into the skill files.
• Optional URL overrides (WERYAI_BASE_URL, WERYAI_MODELS_BASE_URL): video_gen.js defaults to https://api.weryai.com and https://api-growth-agent.weryai.com. Only override them for trusted environments.
• Higher assurance: Run paid jobs in a short-lived shell or isolated environment, and review scripts/video_gen.js before production use.

Prompt expansion (mandatory)

video_gen.js does not expand prompts for you. Before every paid call, turn the user's short brief into a complete production prompt in English unless they already gave you a final long prompt and explicitly asked you not to rewrite it.

For advanced prompt design patterns, read references/seedance-prompt-optimization.md before drafting the final API prompt.

Always add:

• Shot scale, angle, and lens feel.
• Camera movement or a clear lock-off choice.
• Lighting direction, material response, and overall mood.
• Subject motion paced to the selected duration.
• One clear visual payoff in the final shot.
• Output framing such as 9:16 vertical when using the default aspect ratio.

Mode-specific additions:

• Text-to-video: define the scene, motion beat, and ending reveal.
• Single image: preserve identity, composition, and palette from the reference image; keep the motion plausible.
• Multi-image: describe the transition path across the image sequence instead of treating the images as unrelated shots.
• First-frame / last-frame: explicitly describe how the opening frame evolves into the ending frame while preserving the same subject, scene logic, and temporal continuity.

Length: Current frozen Seedance rows in this document use a prompt limit of 2000 chars where documented. If you re-check live metadata with models, trust the live value.

Confirmation: Always show the full expanded prompt and all selected parameters in a table, then wait for the user to reply confirm or request edits.

Prompt optimization workflow

Use this sequence whenever the user asks for stronger Seedance prompt quality or tighter control:

1. Pick the mode first: text-only, single-image, multi-image, or first/last-frame.
2. Map each asset to a role: identity anchor, first frame, waypoint, or ending frame.
3. Break the clip into 2 to 4 timecoded beats based on duration.
4. Write one primary action arc and one clear final payoff.
5. Add only the negative constraints that directly help this request.

If the request is complex, structure the prompt plan internally as:

• Mode
• Asset mapping
• Timeline beats
• Final prompt
• Negative constraints
• Generation settings

Input shapes

Use case	Accepted fields	Notes
Text-to-video	prompt, duration, optional aspect_ratio, resolution, generate_audio	Default model is SEEDANCE_2_0.
Single-image animation	image + prompt	Keeps the reference composition and identity.
Multi-image video	images + prompt	Ordered list, trimmed to the model limit.
Start/end-frame guidance	first_frame + last_frame + prompt	Internally normalized to ordered images.
WaveSpeed-style migration	image + last_image + prompt	Supported as a compatibility alias for end-frame workflows.

Migration notes

• If you are coming from a WaveSpeed-style Seedance workflow, map last_image to this skill's end-frame path. This skill accepts image + last_image as a compatibility alias and normalizes it to the ordered multi-image route.
• Do not rely on local file uploads. Convert or host your references first and pass public https URLs only.
• This skill's metadata correctly declares the required secret (WERYAI_API_KEY) so installers and reviewers can see the runtime contract up front.

Prompt engineering recipes

When the user asks for "better Seedance prompts" rather than just API execution:

• Use the mode table, timeline planning, and prompt skeletons in references/seedance-prompt-optimization.md.
• Prefer timecoded beats over long adjective-heavy paragraphs.
• For first_frame / last_frame or image + last_image, explicitly describe the bridge action between start and end state.
• For images, treat them as ordered waypoints of one coherent shot, not unrelated inspirations.
• For product, character, transformation, or storyboard prompts, use the scenario-specific recipes from the reference file before writing the final prompt.

Workflow

1. Decide which path fits the request: text, image, multi-image, or first-frame/last-frame.
2. Collect the user's brief, duration, optional aspect_ratio, optional resolution, and required HTTPS image URLs if the mode uses references.
3. Expand the prompt with the rules from ## Prompt expansion (mandatory). If the request needs tighter control, read references/seedance-prompt-optimization.md and explicitly decide mode, asset mapping, timeline beats, and negative constraints before writing the final prompt.
4. If you are unsure about current multi-image support or field limits, run node {baseDir}/scripts/video_gen.js models --mode multi_image_to_video before a paid request.
5. Show a confirmation table with the full expanded prompt, model, duration, aspect ratio, resolution, audio choice, and any image URLs.
6. After explicit confirmation, run node {baseDir}/scripts/video_gen.js wait --json '...'.
7. Return the JSON result. On success, surface the video URLs. On failure, report errorCode and errorMessage and suggest the likely parameter fix.

CLI reference

# Check live model metadata
node {baseDir}/scripts/video_gen.js models
node {baseDir}/scripts/video_gen.js models --mode text_to_video
node {baseDir}/scripts/video_gen.js models --mode image_to_video
node {baseDir}/scripts/video_gen.js models --mode multi_image_to_video

# Text-to-video
node {baseDir}/scripts/video_gen.js wait --json '{"prompt":"A paper crane unfolds into a real bird, cinematic lighting, 9:16 vertical","duration":5}'

# Single image to video
node {baseDir}/scripts/video_gen.js wait --json '{"prompt":"Animate this portrait with subtle hair and cloth movement","image":"https://example.com/frame.png","duration":5,"aspect_ratio":"9:16","resolution":"720p"}'

# Multi-image to video
node {baseDir}/scripts/video_gen.js wait --json '{"prompt":"Turn these storyboard frames into one coherent reveal shot","images":["https://example.com/1.png","https://example.com/2.png","https://example.com/3.png"],"duration":5,"aspect_ratio":"9:16"}'

# First-frame / last-frame guided video
node {baseDir}/scripts/video_gen.js wait --json '{"prompt":"Start on the first frame and transition naturally to the last frame with the same subject and environment","first_frame":"https://example.com/start.png","last_frame":"https://example.com/end.png","duration":5,"aspect_ratio":"9:16"}'

# WaveSpeed-style compatibility alias
node {baseDir}/scripts/video_gen.js wait --json '{"prompt":"Transition smoothly from the start image to the end image","image":"https://example.com/start.png","last_image":"https://example.com/end.png","duration":5,"aspect_ratio":"9:16"}'

# Preview without spending credits
node {baseDir}/scripts/video_gen.js wait --json '{"prompt":"A glowing koi swims through ink clouds","duration":5}' --dry-run

# Poll an existing task
node {baseDir}/scripts/video_gen.js status --task-id <task-id>

Definition of done

Done when the user receives at least one playable video URL, or a clear failure with errorCode / errorMessage and a concrete next step. The submitted payload must stay within the selected model's supported field set.

Boundaries (out of scope)

• Do not use local file paths for references; only public https URLs are supported.
• Do not invent undocumented API fields beyond the JSON surface in this skill.
• Do not assume multi-image or first/last-frame support without checking live metadata when the behavior matters.
• Do not store the secret value of WERYAI_API_KEY inside the repository.
• Do not copy parameter names blindly from another provider without checking the normalized fields in this document.

Model & API constraints (frozen for this skill)

Frozen from the repository's current WeryAI capability snapshots. Re-run node {baseDir}/scripts/video_gen.js models after platform upgrades.

Text-to-video (SEEDANCE_2_0)

model_key	durations	aspect_ratios	resolutions	Audio	negative_prompt	Prompt max
SEEDANCE_2_0	5, 10, 15	9:16, 1:1, 16:9	480p, 720p	Yes	No	2000

Image-to-video (SEEDANCE_2_0)

model_key	durations	aspect_ratios	resolutions	Audio	negative_prompt	upload_image_limit
SEEDANCE_2_0	5, 10, 15	9:16, 1:1, 16:9	480p, 720p	Yes	No	3

Multi-image and first-frame / last-frame

• Use the images array for multi-image generation.
• Use either images with ordered URLs, first_frame + last_frame, or image + last_image for start/end-frame control.
• Before a paid submission where multi-image support matters, run node {baseDir}/scripts/video_gen.js models --mode multi_image_to_video and confirm support_multiple_images, support_first_last_frame, upload_image_limit, and allowed output fields on the live account.
• If the live registry says the model cannot take multiple images, the runtime falls back to the first image only.

---

Default parameters

Field	Value
Model	SEEDANCE_2_0
Aspect ratio	9:16
Duration	5
Resolution	720p
Audio	false by default; enable only when you want generated ambience
Prompt style	concise cinematic English prompt with one clear motion beat and one final payoff

---

Text brief -> Seedance video

Use this when the user has only an idea and wants Seedance 2.0 to generate the clip from scratch.

Need from the user:

• Subject or scene
• Motion beat
• Preferred aspect ratio or platform
• Optional duration and resolution

Flow:

1. Expand the brief into a full English prompt.

2. Keep model at SEEDANCE_2_0 unless the user explicitly wants another model.

3. Show a confirmation table:

   📋 Ready to generate - please confirm

   Field	This run	Notes
   model	SEEDANCE_2_0	Override only if the user explicitly requests another model
   aspect_ratio	9:16	Must stay inside the Seedance row
   duration	5	Allowed: 5 / 10 / 15
   resolution	720p	Allowed: 480p / 720p
   generate_audio	false	Turn on only if the user wants generated ambience
   prompt	full expanded prompt	Never show only a summary

4. After confirmation, run:

   node {baseDir}/scripts/video_gen.js wait --json '{"prompt":"...","duration":5,"aspect_ratio":"9:16","resolution":"720p"}'
   

---

Single HTTPS image -> Seedance motion

Use this when the user already has one reference image and wants subtle or medium motion while preserving the subject.

Need from the user:

• One public https image URL
• Desired motion direction
• Optional duration, aspect ratio, and audio

Flow:

1. Expand the prompt around preservation plus motion.

2. Add image to the JSON body.

3. Confirm parameters and URL, then run:

   node {baseDir}/scripts/video_gen.js wait --json '{"prompt":"...","image":"https://example.com/input.png","duration":5,"aspect_ratio":"9:16","resolution":"720p"}'
   

---

Multiple HTTPS images -> Seedance storyboard clip

Use this when the user wants several frames turned into one coherent shot or short sequence.

Need from the user:

• Ordered public https image URLs
• Desired transition logic
• Optional duration and aspect ratio

Flow:

1. Treat the image order as meaningful story order.

2. If support is uncertain, check models --mode multi_image_to_video first.

3. Confirm the final prompt plus ordered images, then run:

   node {baseDir}/scripts/video_gen.js wait --json '{"prompt":"...","images":["https://example.com/1.png","https://example.com/2.png","https://example.com/3.png"],"duration":5,"aspect_ratio":"9:16"}'
   

---

First frame + last frame -> controlled transition

Use this when the user wants tighter motion control from a known opening frame to a known ending frame.

Need from the user:

• One public https start frame
• One public https end frame
• A prompt that explains the in-between action

Flow:

1. Expand the prompt so it explicitly bridges the first frame to the last frame.

2. Use either first_frame / last_frame, image / last_image, or pass the same two URLs through images in order.

3. Confirm both URLs and the full prompt, then run:

   node {baseDir}/scripts/video_gen.js wait --json '{"prompt":"...","first_frame":"https://example.com/start.png","last_frame":"https://example.com/end.png","duration":5,"aspect_ratio":"9:16"}'
   

4. If the live registry rejects multi-image routing, reduce expectations: the runtime will fall back to single-image behavior with the first frame.