seedance-20

seedance-20 is a skill for Claude Code, Codex from mrDesign-ww/vault-os. It costs 178 tokens per session (3,080 once invoked), scanned A, a copy of seedance-20, MIT.

A general operating guide for creating, improving, and troubleshooting Seedance 2.0 videos across supported services. It helps turn an idea into a video prompt while tracking decisions and adapting explanations to the user's experience.

In plain words
What is it for?
Use it for Seedance video creation, prompt improvement, troubleshooting, reference handling, and work across different video-generation platforms.
Why use it?
It provides a consistent process for moving from a vague creative idea to workable video instructions without making the user repeat earlier decisions.

Skill for Claude CodeCodex

Written for Claude Code and Codex: user-invocable in frontmatter, but also agents/openai.yaml present.

Good fit Use it for Seedance video creation, prompt improvement, troubleshooting, reference handling, and work across different video-generation platforms.

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Install with agentmods
npx agentmods add skills/mrdesign-ww/vault-os/seedance-20
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add mrDesign-ww/vault-os --skill seedance-20
Clone the repo
git clone --depth 1 https://github.com/mrDesign-ww/vault-os

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for seedance-20

README.md
[![agentmods](https://agentmods.dev/badge/skills/mrdesign-ww/vault-os/seedance-20/github.svg)](https://agentmods.dev/skills/mrdesign-ww/vault-os/seedance-20)
Your own site
<a href="https://agentmods.dev/skills/mrdesign-ww/vault-os/seedance-20"><img src="https://agentmods.dev/badge/skills/mrdesign-ww/vault-os/seedance-20/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for seedance-20

Your own site · 80×15
<a href="https://agentmods.dev/skills/mrdesign-ww/vault-os/seedance-20"><img src="https://agentmods.dev/badge/skills/mrdesign-ww/vault-os/seedance-20.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 178 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,080 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin 92% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00178 $0.03080
Opus 5 $0.00089 $0.01540
Sonnet 5 $0.00036 $0.00616
Haiku 4.5 $0.00018 $0.00308

Measured 4d ago against content hash 14a618871c5d, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

seedance-20 scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 4d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

92% identical to seedance-20 — 6 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

shell/claude/skills/seedance-20/SKILL.md · 105 lines

How it starts

The opening of the file, as written. The whole thing — 105 lines — stays where its author put it; the contents beside it link to each section on GitHub.

seedance-20

Seedance 2.0 operating loop for agent-directed video work. Use this root skill to route, check facts, protect references, and keep prompts compact before loading specialized sub-skills.

Soul

This skill exists so that a person who arrives with a feeling leaves with a film. Three principles govern everything below:

  1. Hear the intent behind the words. Users describe outcomes ("make it feel like home"), not parameters. Every gate and sub-skill translates feeling into craft; none of them may hand the translation work back to the user.
  2. Keep the story alive. Hold a story state across the conversation: subject, mode, look, references, decided constraints, and what failed before. Every skill reads it before asking anything and updates it after acting. A user should never have to repeat a decision, and a new request inherits the world already built.
  3. Evolve with the user. Speak plainly to a beginner and in director language to a professional - and notice when the same user grows from one into the other across a project. The register adapts; the standards never do.

Fast Lane

Most requests are one short clip from someone who just wants to see their idea. Do not run the full gate loop on them. Take the fast path when the request is a single standalone clip, from a non-expert, with no IP/likeness/brand/real-person or safety flag and no platform-fact question (API, pricing, model ID, limits, region):

  1. Go straight to [skill:seedance-interview-short] - or write the brief immediately if the idea is already clear - then [skill:seedance-prompt-short].
  2. Apply craft inline from memory: one visible beat, one motivated camera move, one motivated light source, sound intent, and the directing coherence rule (name one intention; make camera, light, and performance serve it). Load [ref:directing-engine], [ref:capability-map], [ref:allocation-model], and the source or professional gates only when something actually invokes them.
  3. Treat it as one clip: do not ask sequence or continuation questions yet. Raise "should this be a series, part two, or longer" only after the first draft, or when the user says continue, extend, next part, or longer.
  4. Keep the single-clip prompt compact (about 40-110 words) unless the active surface is a verified stricter API, and keep director language (blocking, directorial voice, shot contracts) inside the internal brief - speak to the user in plain words.

Read the full file on GitHub · 105 lines

Files

What ships with it

60 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 4d ago First seen · 105 lines · 178 tokens per session scan A 14a618871c5d

Subscribe to this mod's changes

seedance-20 is a skill published in the GitHub repository mrDesign-ww/vault-os (2 stars, last pushed 5d ago), licensed MIT. It adds 178 tokens to every session and 3,080 once invoked, about $0.0009 per session on Opus 5. A static security scan graded it A with 0 findings. It is 92% identical to seedance-20, differing in 6 lines, and is treated as a copy.