Video Shader Generator

What it does

When your agent uses it

• Adding a crossfade, wipe or 3D cube transition between clips
• Applying a zoom or push-in to a video track
• Creating a mask or reveal effect with a custom shader
• Building a film-look color grade

Example prompts

• “Add a push-in zoom on the whole first clip.”
• “Make a page-curl transition between the intro and the first scene.”
• “Give the footage a warm film-look color grade.”

Requirements

• The OpenChatCut editor and its agent tools such as `browse_library` and `edit_item`
• The backend generation service that `generate.ts` submits jobs to

Workflow steps

2 steps, taken from the first numbered list in SKILL.md.

1. 1Catalog entry — use browse_library for built-in and project effects/transitions.
2. 2User-uploaded .cube LUT asset that already exists in the project library — separate code path, see "Applying an Existing LUT Asset" below…

What it can do on your machine

Read from SKILL.md and the folder at commit 2e6f4a2. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  No scripts in the folder and no shell commands in SKILL.md (its code samples are typescript).

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md.

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Video Shader Generator loads about 3.2k tokens when it runs, and up to ~7.5k if it reads all its reference files. Until then it costs about 94 tokens; SKILL.md has 1,186 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~94

When it runs · the whole SKILL.md, loaded when a task matches

~3.2k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~7.5k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from 0xsline/OpenChatCut at commit 2e6f4a2, republished under its AGPL-3.0 licence (© 0xsline). 1,186 words, ~3,206 tokens.

name

shader-gen

description

AI shader generator for WebGL video effects, transitions, masks, and color grading (LUT / 调色 / 电影感 / film look). Use when the user wants a video effect (滤镜 / 特效), a transition (转场 / crossfade / wipe / cube / 3d), a mask (蒙版 / 遮罩 / reveal), a zoom / push-in (推近 / 推镜头), or a color grade — try the built-in effects (zoom, builtin LUTs) before generating a new shader.

user-invocable

true

browse_library(query: "zoom")
browse_library(category: "transitions", query: "dissolve")
browse_library(category: "audio-fx")

# Zoom on the entire video clip
edit_item(json: '{"adds":[{"type":"effect","assetId":"builtin:zoom","mode":"track-bound","trackId":"<clip-trackId>","trackBoundFrom":<clip-fromFrame>,"trackBoundDurationInFrames":<clip-durationInFrames>,"propertyOverrides":{"magnification":1.5,"shape":"hold"}}]}')

# Zoom on a sub-range of the clip (e.g. frames 90–150 only, a punch zoom on a beat)
edit_item(json: '{"adds":[{"type":"effect","assetId":"builtin:zoom","mode":"track-bound","trackId":"<trackId>","trackBoundFrom":90,"trackBoundDurationInFrames":60,"propertyOverrides":{"magnification":2,"shape":"punch"}}]}')

edit_item(json: '{"adds":[{"type":"effect","targetItemId":"<clip-id>","assetId":"builtin:slog3-s709","propertyOverrides":{"intensity":1}}]}')

edit_item(json: '{"adds":[{"type":"effect","targetItemId":"<clip-id>","assetId":"lut","propertyOverrides":{"intensity":1,"lut":{"assetId":"<lut-asset-id>","assetType":"lut","type":"asset"}}}]}')

submit_shader({
  type: "effect",
  prompt: "Chromatic aberration with RGB split",
  name: "Chromatic Aberration",
});

submit_shader({
  type: "transition",
  prompt: "Smooth crossfade with soft edge",
  name: "Crossfade",
});

submit_shader({
  type: "effect",
  prompt: "Cinematic teal-orange color grade",
});

submit_shader({
  type: "effect",
  prompt: "Stronger version",
  referenceAssetIds: ["effect_asset_id"],
});

edit_item(json: '{"adds":[{"type":"effect","targetItemId":"<id>","assetId":"<id>","enabled":true,"propertyOverrides":{}}]}')

edit_item(json: '{"adds":[{"type":"transition","assetId":"<id>","outgoingItemId":"<id1>","incomingItemId":"<id2>","durationInFrames":30}]}')

© 0xsline, AGPL-3.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 5 other files (references) in src/agent/skills/shader-gen of 0xsline/OpenChatCut.

• SKILL.md
• examples/cube-rotate.md
• examples/door-open.md
• examples/page-curl.md
• references/design-principles.md
• references/property-changes.md

Open the folder on GitHubat commit 2e6f4a2

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in 0xsline/OpenChatCut, which our catalogue first saw on October 7, 2026.

• infometa/workbuddyskillsexperts/chatcut-video-editor/skills/shader-gen