Seedance 2.5 OS

An approachable AI agent skill that turns an ordinary-language video idea into recommended Seedance 2.5 settings, clear reference roles, and one paste-ready prompt.

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Why 2.5 · What it does · Quick start · Install · How it works · Validate

Community project. Not an official ByteDance, Jimeng, or Dreamina product.

Why 2.5 OS

Seedance 2.5 changes the default video workflow instead of merely adding new parameters to Seedance 2.0:

• Standard generation supports 4–30 seconds with timestamp-controlled story beats.
• Ultra-long mode handles complete 30–180 second narratives.
• Native extension keeps accepted footage and generates only what comes before or after it.
• Multimodal reference expands to as many as 30 images, 10 videos, and 10 audio files, including audio-only input.
• Smart Edit, Advanced Edit, and Video Edit can repair a local problem without regenerating everything.
• Green screen, white-model rendering, multi-panel storyboards, viewpoint changes, BGM separation, and seamless transitions are first-class workflows.

This project therefore does not copy Seedance 2.0 prompt recipes. It rebuilds routing, prompt structure, reference ownership, and failure repair around Seedance 2.5.

What it does

Quick start

Install the Skill, then ask your AI assistant in plain language:

Use $seedance-25 to create a 30-second vertical healing short:
a girl brings a stray cat home on a rainy night.

The Skill returns:

1. The recommended mode, duration, aspect ratio, and resolution.
2. A role map for every reference asset.
3. One complete prompt ready to paste into Jimeng/Dreamina.
4. One practical note that prevents the most likely failure.

No T2V, R2V, timeline-script, or white-model vocabulary is required.

Install

Clone and install

git clone https://github.com/allenGKC/Seedance-2.5.git
cd Seedance-2.5
./install.sh

The installer copies the Skill into the default personal skills directory. If an older installation exists, it creates a timestamped backup first.

On Windows PowerShell:

git clone https://github.com/allenGKC/Seedance-2.5.git
cd Seedance-2.5
.\install.ps1

Manual install

If your agent supports manual Skill installation, copy the complete skill/seedance-25 directory into the personal skills location documented by your client. Restart the client or open a new task so its skill list is reloaded.

Using reference media

Upload the media first, then give every file exactly one job:

Use $seedance-25.
@Image1 controls the girl's identity. @Image2 controls the cat's appearance.
@Video1 supplies only the rainy-night tracking movement; do not transfer its people or location.
Create a 30-second 9:16 healing short.

Clear ownership matters more than a long prompt: identity, action, camera, environment, sound, and timing should not compete across references.

How it works

ordinary-language idea
        ↓
choose generation / long video / extension / edit
        ↓
assign one responsibility to each reference
        ↓
build a timestamped prompt when the story needs phases
        ↓
return one recommended setup and one paste-ready prompt

Design principles

• Beginner first: if the idea is clear, generate directly instead of starting a long interview.
• One best answer: return the strongest default prompt rather than handing the user a menu of near-duplicates.
• Native 2.5 workflow: prefer ultra-long video for long stories, editing for local defects, and native extension for continuation.
• Explicit reference ownership: identity, action, camera, scene, sound, and time each get a clear controller.
• Bounded claims: Jimeng Web documentation is not presented as a universal API or third-party-platform limit.
• Honest observation: media that cannot actually be viewed or heard is never described as inspected.

Repository layout

Seedance-2.5/
├── assets/hero.png          # README masthead
├── docs/README.zh.md        # Simplified Chinese README
├── skill/seedance-25/       # Installable Skill
│   ├── SKILL.md             # Main router and beginner workflow
│   ├── agents/              # Optional agent UI metadata
│   └── references/          # Seedance 2.5 topic references
├── scripts/validate.py      # Dependency-free structure checks
├── install.sh               # macOS / Linux installer
├── install.ps1              # Windows installer
└── .github/workflows/       # Automated validation

Human-facing project documents stay outside the installed Skill so they do not consume extra agent context.

Validate

python3 scripts/validate.py

The validator checks Skill metadata, required files, internal references, unfinished markers, and UI configuration. The same check runs automatically on every push and pull request.

Sources and scope

Seedance 2.5 capabilities and parameters are primarily based on the Jimeng Seedance 2.5 User Guide, last reviewed on 2026-08-02.

Those numbers describe the Jimeng Seedance 2.5 surface documented there. API availability, third-party routes, pricing, model IDs, regional access, and UI behavior can change; verify the current documentation for the platform you actually use.

Contributing

Bug reports, failed-prompt examples, platform changes, and improvements are welcome. Read CONTRIBUTING.md before opening a contribution. Report security concerns privately as described in SECURITY.md.

License

MIT License