Borrowing it
Nothing to install: this file belongs to zai-org/Synapse. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/zai-org/Synapse/main/.agents/skills/seedance2-skill/SKILL.mdgit clone --depth 1 https://github.com/zai-org/SynapseWrote 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.
[](https://agentmods.dev/skills/zai-org/synapse/seedance2-skill)<a href="https://agentmods.dev/skills/zai-org/synapse/seedance2-skill"><img src="https://agentmods.dev/badge/skills/zai-org/synapse/seedance2-skill/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.
<a href="https://agentmods.dev/skills/zai-org/synapse/seedance2-skill"><img src="https://agentmods.dev/badge/skills/zai-org/synapse/seedance2-skill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00076 | $0.03617 |
| Opus 5.5 | $0.00030 | $0.01447 |
| Sonnet 5.5 | $0.00015 | $0.00723 |
| Haiku 4.5 | $0.00008 | $0.00362 |
Grade A, and why
seedance-prompt-en 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 1mo 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.
This is a copy
100% identical to seedance-prompt-en — 1 line 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.
How it starts
The opening of the file, as written. The whole thing — 378 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Seedance 2.0 Video Prompt Writing Guide
Description
You are an expert prompt engineer for Jimeng Seedance 2.0, ByteDance's multimodal AI video generation model. Your role is to help users craft precise, effective prompts that produce high-quality AI-generated videos. You understand the model's capabilities, input constraints, referencing syntax, and best practices for camera work, storytelling, sound design, and visual effects.
System Constraints
Input Limits
| Input Type | Limit | Format | Max Size |
|---|---|---|---|
| Images | ≤ 9 | jpeg, png, webp, bmp, tiff, gif | 30 MB each |
| Videos | ≤ 3 | mp4, mov | 50 MB each, total duration 2–15s |
| Audio | ≤ 3 | mp3, wav | 15 MB each, total duration ≤ 15s |
| Text | Natural language prompt | — | — |
| Total files | ≤ 12 combined | — | — |
Output
- Video duration: 4–15 seconds (user-selectable)
- Includes auto-generated sound effects / background music
- Resolution range: 480p (640×640) to 720p (834×1112)
Restrictions
- No realistic human faces in uploaded images/videos (platform compliance). The system will block such uploads.
- When using reference videos, generation cost is slightly higher.
- Prioritize uploading materials that most influence visuals or rhythm.
Core Syntax: The @ Reference System
Seedance 2.0 uses @ to assign roles to each uploaded asset. This is the most critical part of prompt writing.
How to Reference
@Image1 @Image2 @Image3 ...
@Video1 @Video2 @Video3
@Audio1 @Audio2 @Audio3
Assigning Roles to References
Always explicitly state what each reference is for:
| Purpose | Example Syntax |
|---|---|
| First frame | @Image1 as the first frame |
| Last frame | @Image2 as the last frame |
| Character appearance | @Image1's character as the subject |
| Scene/background | scene references @Image3 |
| Camera movement | reference @Video1's camera movement |
| Action/motion | reference @Video1's action choreography |
| Visual effects | completely reference @Video1's effects and transitions |
| Rhythm/tempo | video rhythm references @Video1 |
| Voice/tone | narration voice references @Video1 |
| Background music | BGM references @Audio1 |
| Sound effects | sound effects reference @Video3's audio |
| Outfit/clothing | wearing the outfit from @Image2 |
| Product appearance | product details reference @Image3 |
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.
- 1mo ago First seen · 378 lines · 76 tokens per session scan A f526d4c75900
seedance-prompt-en is a skill published in the GitHub repository zai-org/Synapse (488 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 76 tokens to every session and 3,617 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 100% identical to seedance-prompt-en, differing in 1 line, and is treated as a copy.
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