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unity-vrc-udon-sharp

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UdonSharp scripting skill for VRChat SDK 3.10.6 (active and verified target). Use when writing, reviewing, debugging, or migrating UdonSharp C# and UdonBehaviour code. Positive triggers include UdonSharp, NetworkCallable, NetworkCalling, CallingPlayer, Udon network authorization, synced runtime state, a local public helper, public-method audit, C# to Udon conversion, and UdonSharp Assembly Version Defines. VRCQualitySettings, VRCBillboard, constraint source, and VRCTween calls, PhysBone/Contact callbacks, world VRCPhysBoneCollider runtime access, persistence, collection, web, and other component APIs trigger this skill when the request is about Udon, C#, or runtime API access. Excludes scene setup, component setup, Build Panel work, layers, scene and rendering optimization, and upload; route those requests to unity-vrc-world-sdk-3.

skills/unity-vrc-udon-sharp/SKILL.md

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Nov 10, 2026
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# UdonSharp Skill

## Why This Skill Matters

UdonSharp looks like regular Unity C# scripting — until you hit its hidden walls. Many standard C# features (`List<T>`, `async/await`, `try/catch`, LINQ, generics) **silently fail or refuse to compile** in code that runs in the Udon runtime. Editor-evaluated field initializers are a separate context: they can use some ordinary C# features to generate a final value that Udon can hold. Networking is even more treacherous: modifying a synced variable without ownership produces no error — it just does nothing. Forgetting `RequestSerialization` means your state changes never leave your machine. Standard single-player local testing gives zero signal about these networking bugs because there is only one player.

Every rule in this skill exists because UdonSharp's default behavior is to **fail silently**. Read the Rules before generating any code.

## Before Writing Network Code

Four architectural decisions that must be made before choosing sync modes or writing any synced variable. Changing them mid-implementation typically requires a full rewrite:

- **Who owns this state?** One owner writes; all others read. If two players can both write (e.g., a shared toggle), you need an ownership transfer protocol — writes without ownership are silently discarded.
- **When does ownership transfer?** On grab? Interact? Game event? `OnPlayerLeft`? `Networking.SetOwner` is **locally immediate** on the calling client — `Networking.IsOwner(gameObject)` is `true` synchronously after the call, and writing `[UdonSynced]` fields plus `RequestSerialization()` immediately afterwards is safe under an `IsOwner` guard. Concurrent `SetOwner` calls from multiple clients are resolved by network arrival order — there is no client-side arbitration, so accept that the loser's write is overwritten.
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