Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/besty0728/unity-skills/netcode-designnpx skills add Besty0728/Unity-Skills --skill netcode-designgit clone --depth 1 https://github.com/Besty0728/Unity-SkillsWhat 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 | $0.00020 | $0.01224 |
| Opus 5 | $0.00010 | $0.00612 |
| Sonnet 5 | $0.00004 | $0.00245 |
| Haiku 4.5 | $0.00002 | $0.00122 |
Grade A, and why
unity-netcode-design 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 2d 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.
How it starts
The opening of the file, as written. The whole thing — 67 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Before calling any skill in this module: if you are about to call a skill with parameters guessed from its name or description, STOP — read this file (or fetch its schema via
GET /skills/recommend?includeSchema=true) first. If you already have the parameter definitions from recommend/schema, you may proceed straight to dryRun.
Triggers
- Writing or reviewing multiplayer code
- Designing server/distributed authority
- Wiring RPCs or NetworkVariables
- Debugging netcode
- 编写或审查多人联机代码、设计服务器/分布式权威、连接 RPC 或网络变量、排查 netcode 问题
Netcode for GameObjects - Design Rules
Advisory module. Every rule is distilled from com.unity.netcode.gameobjects 2.x source. Each rule cites a concrete file/line so the reasoning is auditable.
Mode: Documentation only — no REST skills to gate; load freely under any operating mode (Approval / Auto / Bypass).
When to Load This Module
Load before writing or reviewing any of:
- NetworkBehaviour scripts (OnNetworkSpawn / OnNetworkDespawn / RPCs / NetworkVariables)
- NetworkManager startup / shutdown / scene switching
- NetworkObject Spawn / Despawn / ChangeOwnership / TrySetParent
- UnityTransport configuration (direct connect / Relay)
- Any code that branches on IsHost / IsServer / IsClient / IsOwner
Critical Rule Summary (memorize even if you skip the sub-docs)
| # | Rule | Source anchor |
|---|---|---|
| 1 | Spawn() / Despawn() must be called on Server/Host only; client-side calls fail. |
Runtime/Core/NetworkObject.cs:1884, 1921 |
| 2 | OnNetworkSpawn() runs before Unity Start() and after Awake/OnEnable. |
Runtime/Core/NetworkBehaviour.cs:704 + InvokeBehaviourNetworkSpawn callers |
| 3 | Legacy [ServerRpc] method names must end with ServerRpc; [ClientRpc] must end with ClientRpc (ILPP enforced at compile time). |
Editor/CodeGen/ ILPP validators |
| 4 | New [Rpc(SendTo.X)] has no naming constraint; SendTo has 11 values. |
Runtime/Messaging/RpcTargets/RpcTarget.cs:9-80 |
| 5 | PlayerPrefab must exist in NetworkPrefabsList or NetworkConfig.Prefabs or 2.x runtime rejects it. |
Runtime/Configuration/NetworkConfig.cs:40 + NetworkPrefabsList.cs:14 |
| 6 | Nested NetworkObjects are forbidden (NetworkObject inside another NetworkObject prefab). Re-parent at runtime via TrySetParent. |
Runtime/Core/NetworkObject.cs:2135-2215 |
| 7 | NetworkVariable<T> requires T to be unmanaged or implement INetworkSerializable. string, List<>, class are rejected. |
Runtime/NetworkVariable/NetworkVariable.cs:12 + ILPP |
| 8 | NetworkList<T> requires T: unmanaged, IEquatable<T>. It is NOT NetworkVariable<List<T>>. |
Runtime/NetworkVariable/Collections/NetworkList.cs:14 |
| 9 | NetworkSceneManager.LoadScene/UnloadScene is Server-only. |
Runtime/SceneManagement/NetworkSceneManager.cs:1496, 1252 |
| 10 | UnityTransport.SetRelayServerData and SetConnectionData are mutually exclusive; use one or the other. |
Runtime/Transports/UTP/UnityTransport.cs:776-897 |
What ships with it
8 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 2d ago First seen · 67 lines · 20 tokens per session scan A 330ba44428ab
unity-netcode-design is a skill published in the GitHub repository Besty0728/Unity-Skills (1,695 stars, last pushed today), licensed MIT. It adds 20 tokens to every session and 1,224 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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