Art Process Video

Generate vertical short videos of painting / retouching creative process (WeryAI): layered progression from sketch to finish—illustration coloring, posters,...

Art process video generation

Time-compressed journey from pencil sketch to final piece—lines grow denser, color goes from none to full, detail stacks layer by layer, the last stroke lands, and the finished work is revealed. The process is the content; no on-screen copy needed. Fits illustrators, designers, and art accounts.

Dependencies: scripts/video_gen.js in this directory + WERYAI_API_KEY in the environment + Node.js 18+. No dependency on other Cursor skills.

Prerequisites

• WERYAI_API_KEY must be set in the environment before running video_gen.js.
• Node.js 18+ is required. Image inputs must be public https URLs (no local file paths).
• Each successful wait run consumes WeryAI credits; re-running creates new paid tasks.

Security, secrets, and API hosts

• WERYAI_API_KEY: Treat as a secret. Only configure it if you trust this skill's source; it is listed in OpenClaw metadata as requires.env / primaryEnv so installers know it is mandatory at runtime (never commit it inside the skill package).
• 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. Overrides are intended for testing or approved alternate endpoints. If these variables are set in your environment, confirm they point to hosts you trust—otherwise prompts, images, and your bearer token could be sent elsewhere.
• Higher assurance: Run generation in a short-lived or isolated environment (separate account or container), and review scripts/video_gen.js (HTTPS submit + poll loop) before production use.

Prompt expansion (mandatory)

video_gen.js does not expand prompts. Before every wait --json, turn the user's short or vague brief into a full English production prompt.

When: The user gives only keywords, one line, or loose intent—or asks for richer video language. Exception: They paste a finished long prompt within the model's prompt_length_limit and ask you not to rewrite; still show the full text in the confirmation table.

Always add (video language): shot scale and angle; camera move or lock-off; light quality and motivation; subject action paced to duration; one clear payoff for this niche; state 9:16 vertical when this skill defaults to vertical.

Length: Obey prompt_length_limit for the chosen model_key when this doc lists it; trim filler adjectives before removing core action, lens, or light clauses.

Confirmation: The pre-submit table must include the full expanded prompt (never a one-line summary). Wait for confirm or edits.

Niche checklist

• Process arc: sketch → base color → detail → final frame much richer than the opening blank or rough lines.
• Medium & subject: name tablet/paper/watercolor and what is being painted or designed; use time-lapse / speed-ramp language when duration is short.
• Camera & light: top-down, eye-level screen, or macro brush; motivated desk/canvas/monitor light; show stroke motion and rising saturation.

### Example prompts at the top of this file are short triggers only—always expand from the user's actual request.

Workflow

1. Confirm the user request matches this skill's scenario (text-to-video and/or image-to-video as documented).
2. Collect the user's brief, optional image URL(s), tier (best / good / fast) or an explicit model key.
3. Expand prompt (mandatory): Unless the user supplied a finished long prompt and explicitly asked not to rewrite it, expand the brief into a full English production prompt using ## Prompt expansion (mandatory) below. Do not call the API with only the user's minimal words.
4. Check the expanded prompt against the selected model's prompt_length_limit in the frozen tables in this document (when present); shorten if needed.
5. Verify duration, aspect_ratio, resolution, generate_audio, negative_prompt, and other fields against the frozen tables and API notes in this SKILL.md.
6. Show the pre-submit parameter table including the full expanded prompt; wait for confirm or edits.
7. After confirmation, run node {baseDir}/scripts/video_gen.js wait --json '...' with the expanded prompt.
8. Parse stdout JSON and return video URLs; on failure, surface errorCode / errorMessage and suggest parameter fixes.

CLI reference

node {baseDir}/scripts/video_gen.js wait --json '{"model":"…","prompt":"…","duration":5,"aspect_ratio":"9:16"}'
node {baseDir}/scripts/video_gen.js wait --json '…' --dry-run
node {baseDir}/scripts/video_gen.js status --task-id <id>

Definition of done

Done when the user receives at least one playable video URL from the API response, or a clear failure explanation with next steps. All parameters used must fall within the selected model's allowed sets in this document. The submitted prompt must be the expanded production prompt unless the user explicitly supplied a finished long prompt and asked not to rewrite it.

Boundaries (out of scope)

• Does not review platform compliance, copyright, or portrait rights; does not guarantee commercial usability of outputs.
• Does not provide non-WeryAI offline rendering, traditional edit timelines, or API field combinations not documented here.
• Does not hard-code absolute paths in the skill doc; {baseDir} means the skill package root (same level as SKILL.md).

Example prompts

• Character illustration on a tablet from pencil sketch to full color, vertical accelerated process
• Use this line-art image to animate gradual color, light, and shadow until the final piece
• Poster typography process from grid to final logotype, art-account style
• Digital painting process 9:16, layers build up, satisfying brush strokes

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Default parameters

Field	Value
Model	KLING_V3_0_PRO
Aspect ratio	9:16 (fixed)
Duration	10 seconds (duration: 10—enough time to show layered progression)
Audio	Off
Visual style	Top-down or eye-level close-up; canvas or tablet in frame; clear brush motion; color fills progressively; time-compressed timeline

API validity (default KLING_V3_0_PRO): Text-to-video duration only 5 / 10 / 15; aspect_ratio only 9:16, 1:1, 16:9. Image-to-video aspect_ratio only 9:16, 16:9, 1:1. No resolution field—do not send it. For fast tier with VEO: text-to-video VEO_3_1_FAST, image-to-video CHATBOT_VEO_3_1_FAST, with duration fixed at 8, aspect_ratio only 9:16 or 16:9. When switching model_key, follow the allowed sets in this section’s model/API constraints and the API validity note above; do not send resolution to models that do not support it.

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Full creative process: sketch to finish

Purpose: Show one illustration or design from blank to done. Pace is time-lapse compression: stroke density rises with progress, saturation climbs from low to high, and the final frame should feel dramatically richer than the starting blank.

The user should provide:

• Subject (bear / cat / bunny / or a theme like “forest spirit,” “cyber girl”)
• Style (dreamy watercolor / line-art B&W / thick oil-like paint / flat design / cyberpunk illustration)
• Medium (paper + pencil / tablet + stylus / watercolor paper / digital screen)

Generation flow:

1. Confirm subject, style, and medium.

2. Build the prompt in three phases: light sketch lines → base color blocking → detail polish and finish, with clear visual beats per phase.

3. If parameters are unspecified, show defaults and wait for confirmation: You must show all parameters in a table and wait for explicit user confirmation before submitting:

   📋 Ready to generate—please confirm:

   Parameter	This run	Notes
   model	KLING_V3_0_PRO	Best tier default; say “cheap / draft / fast” → WAN_2_6; say “balanced” → KLING_V3_0_STA; or name a model directly
   aspect_ratio	9:16	Default KLING: 9:16, 1:1, 16:9 only; if you change model, check that model’s aspect_ratios in the table
   duration	10s	KLING family: 5 / 10 / 15; VEO fast: duration 8 only
   generate_audio	false	Whether to auto-generate audio
   prompt	Full expanded English prompt (entire text for this run)	Revise before confirm
   Loop seam	No	Reply “loop” to enable seamless loop

   Reply “confirm” to start, or list what to change.

4. After confirmation, run in the terminal ({baseDir} is the skill root):

   node {baseDir}/scripts/video_gen.js wait --json '{"model":"（model from confirmation table）","prompt":"（full expanded English prompt）","aspect_ratio":"9:16","duration":10,"generate_audio":false}'
   

   aspect_ratio, duration, generate_audio, and model must match the table; add resolution only if the model supports it. Parse stdout videos for URLs.

Parameter configuration:

Field	Value
model	KLING_V3_0_PRO
aspect_ratio	9:16
duration	10
generate_audio	false

Expanded prompt: Compose at generation time per ## Prompt expansion (mandatory) from the user's actual brief—do not reuse fixed sample paragraphs.

Expected outcome: Clear three-beat rhythm (blocking color, detail pass, final reveal), rising visual density from sparse to rich, final frame clearly stronger than the start—good for process content on art accounts.

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Single “brushstroke” hero moment

Focus on one stunning beat: one highlight dot makes the eye “wake up,” a gradient snaps into place, one line closes the piece—better for punchy shorts than a full process.

Say which “one stroke” moment to show; build the prompt directly:

Parameters are shown before generation; wait for confirmation before submit.

Expanded prompt: Compose at generation time per ## Prompt expansion (mandatory) from the user's actual brief—do not reuse fixed sample paragraphs.

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Prompt tips

Process rhythm: layer by layer, stage by stage with visible progress, time-lapse with speed ramp at details phase, complexity builds frame by frame

Finish impact: final reveal is dramatically more complex than the starting blank, the completed piece has gallery-quality depth, jaw-dropping transformation from empty canvas

Brush feel: stylus catches tablet light, pencil line weight variation visible, watercolor bleeds naturally at paper texture, digital brush softness in layered opacity

Note: Ten seconds is already tight for a full process; say time-lapse compression in the prompt so the model treats it as accelerated display, not real-time drawing speed.