Unity Vrc World SDK 3

What it does

When your agent uses it

• VRChat world scene configuration
• VRC SDK components
• Quest/Android performance
• Dynamics for Worlds

Example prompts

• “/unity-vrc-world-sdk-3”

What it can do on your machine

Read from SKILL.md and the folder at commit f6dc6c0. 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

  Ships script files (C#), which the agent can run.

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

• Network

  Links to these hosts (documentation or services it may open):

  • creators.vrchat.com

  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

Unity Vrc World SDK 3 loads about 7.8k tokens when it runs, and up to ~45k if it reads all its reference files. Until then it costs about 259 tokens; SKILL.md has 2,416 words of instructions outside code blocks.

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

~259

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

~7.8k

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

~45k

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 niaka3dayo/agent-skills-vrc-udon at commit f6dc6c0, republished under its MIT licence (© niaka3dayo). 2,416 words, ~7,805 tokens.

name

unity-vrc-world-sdk-3

description

VRChat World SDK 3 guide for scene and Inspector setup, component placement, optimization, and upload. Use for VRChat world scene configuration, VRC SDK components, layers, baked lighting, Quest/Android performance, Dynamics for Worlds, Build Panel warning triage, validation, and upload. Covers WorldQualitySettings, VRC_SceneDescriptor, VRC_Pickup, VRC_Station, VRC_Mirror, VRC_ObjectSync, VRC_CameraDolly, spawn points, collision matrices, PhysBone and Contact component placement, Box Contacts, Global Avatar PhysBone Colliders, and VRCPhysBoneCollider component setup. Active support / last verified: SDK 3.10.5. Triggers on: VRChat world scene, VRC SDK, scene setup, component placement, optimization, Quest support, light baking, upload, SDK validation, Build Panel warning, Auto Fix, red warning, yellow warning, or white warning. Do not use for UdonSharp C# or VRCTween calls; use unity-vrc-udon-sharp for runtime scripting. UdonSharp package, asmdef, and Version Defines work also belongs to that skill.

license

MIT

metadata.author

niaka3dayo

metadata.version

4.1.1

metadata.tags

vrchat, world-sdk, scene-setup, optimization, components, upload, sdk-validation, build-panel

Quest required? → Yes
  ├── Shaders: World shaders are unrestricted; prefer mobile-compatible shaders and profile custom ones
  ├── Lighting: Baked by default; retain realtime effects only after target-device profiling
  ├── Geometry: Budget approximately 250,000 triangles for the whole world; reduce further when profiling calls for it
  ├── Materials: Minimize unique materials and draw calls; no fixed world upload limit is documented
  ├── Audio: Mono, compressed, limited concurrent sources
  └── Physics: Simplified colliders, minimal Rigidbodies

[VRCWorld Prefab]
├── VRC_SceneDescriptor (Required)
├── VRC_PipelineManager (Auto-added)
├── VRCWorldSettings (Optional - movement speed settings)
└── AvatarScalingSettings (Optional - avatar scale limits)

// Usage:
// 1. Adjust Near/Far clipping (recommended for VR: 0.01 ~ 1000)
// 2. Apply Post Processing effects
// 3. Set background color

// ⚠️ MUST disable the Camera component after configuring — an active Reference Camera
//    renders a second viewport. VRChat reads only the camera settings, not its output.
// Assign the configured (disabled) Camera to VRC_SceneDescriptor > Reference Camera.

// Spawn points are empty GameObjects assigned to VRC_SceneDescriptor > Spawns array.
// Players enter facing the Z+ direction of the spawn Transform.

// VRChat-specific requirements:
// - At least 2-3 spawn points (for simultaneous joins — single spawn causes overlap)
// - Place slightly above the floor (~0.1m) to avoid floor collision on spawn
// - Keep clear of obstacles (VR player guardian area is larger than their avatar)
// - Account for VR guardian boundaries — desktop player sizes differ from VR

□ Exactly one VRCWorld Prefab exists in the scene
□ At least one Transform set in Spawns
□ Respawn Height set to an appropriate value (well below the floor)
□ Reference Camera configured for clipping distances (for VR)
□ Layer/Collision Matrix correctly configured
□ "Setup Layers for VRChat" has been executed

1. VRChat SDK > Show Control Panel
2. Builder tab
3. Click "Setup Layers for VRChat"
4. Collision Matrix is automatically configured

✅ Recommended settings:
├── Lightmapper: Progressive GPU
├── Lightmap Resolution: 10-20 texels/unit (PC) / 5-10 (Quest)
├── Light Mode: Baked by default; use Mixed/Realtime only when the effect is necessary and measured
└── Light Probes: Place along player paths

❌ Avoid:
├── Realtime lights (dynamic shadows)
├── High-resolution lightmaps (memory consumption)
└── Excessive Reflection Probes

1. Check Validation
   └── VRChat SDK > Build Panel > Validations

2. Build & Test (local testing)
   └── "Build & Test New Build"
   └── Supports multi-client testing

3. Upload
   └── "Build and Upload"
   └── Set Content Warnings
   └── Set Capacity

4. Publish settings
   └── Configure public/private on the VRChat website

□ VRC_SceneDescriptor × 1
□ Spawns configured
□ Respawn Height appropriate
□ Layer/Collision Matrix verified
□ Light baking complete
□ Mirror default OFF
□ Project-defined frame-time or frame-rate target met in representative scenes and player counts
□ No Validation errors
□ Content Warnings set
□ Capacity set

© niaka3dayo, MIT. 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 12 other files (references, assets) in skills/unity-vrc-world-sdk-3 of niaka3dayo/agent-skills-vrc-udon.

• SKILL.md
• CHEATSHEET.md
• LICENSE.txt
• assets/templates/VRC_Pickup_Rigidbody.cs
• assets/templates/VRC_Station_Basic.cs
• references/audio-video.md
• references/build-validation.md
• references/components.md
• references/layers.md
• references/lighting.md
• references/performance.md
• references/troubleshooting.md
• references/upload.md

Open the folder on GitHubat commit f6dc6c0