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Graph/client-host-authoritative-sync

Pattern

Client-Host State Separation

client-host-authoritative-sync

Client-side events (e.g., landing/damage triggers or Razor state updates) fire on the owning client, but authoritative game state must be applied on the host, otherwise damage, sounds, and UI desync or double-apply.

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Updated8/2/2026

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30 linked nodes

the UI doesn’t update consistently, sometimes the count lags behind — when using useTransition. Tension: especially after fast re-renders or route changes. Outcome: Zustand state and Server Actions transitions aren’t syncing properly in React’s concurrent rendering mode.

Both `onServerCode` and `onServerRecommendation` have a stale closure over the initial `projectIdStorage` state — socket.on("server_recommendation", onServerRecommendation); socket.on("server_code", onServerCode);. Tension: the server event handlers have the current project id value. Outcome: Update the `useEffect` hook to use a dependency on the `projectIdStorage` value.

Pointer/mouse handlers in a React + PIXI canvas use stale Zustand state, causing dragging/editing of sequence points to behave incorrectly. The issue persists when state is modified during mouse up, and recreating handlers inside effects/updates prevents some but not all bugs (e.g., cannot drag twice).

Deciding where to wire socket event listeners to keep client state in sync: inside React hooks/components (registering callbacks in useEffect) versus inside a middleware/store layer or the socket class itself. The question also asks about the downsides of each approach.

In a Next.js app, server actions need to be invoked from a component marked with 'use client' to support shadcn/ui form integration, but the current setup fails because server actions cannot be directly executed in client components.

requests with the forbidden fields sailed through to the write path. Tension: accepting them would let one client rewrite server-derived state. Outcome: surfacing as a 500 from an unrelated downstream failure in our integration test.

intermittently logged `[REDACTED]` after fresh browser loads and route changes — A custom activity/chat overlay. Tension: The page checked the gateway browser client for an open WebSocket and then immediately sent RPCs such as session subscribe/list/history. Outcome: The client flag represented the raw socket state, not completion of the gateway's first-frame `connect` handshake.

Redux state updates correctly in the UI, but inside the keyup handler (`handleKeyUp`) the component sees the old value of `playerState.isMenuUIVisible`. As a result, conditional logic (e.g., Escape handling) doesn’t run when expected.

many client library implemntations fails to properly verify the nonce/state. Tension: leaving the clients vulnerable. Outcome: PKCE will still protect them.

Resetting the timer by lifting/resetting state in the parent causes the app/game to become unresponsive due to frequent re-renders. The Timer component also attempts to reset its local state during render, leading to problematic behavior.

do my fences interrupt other guests on the machine? — running in a VM on a cloud provider. Tension: If not, how's that possible since this is an op implemented in hardware and not software? Outcome: Fences are local, affecting only the current thread.

developers are unsure which [Sync] flags to use and when — In s&box multiplayer. Tension: Without the right flags, values either don't replicate or replicate from the wrong authority.

calling [Rpc.Host] from a client does nothing, calling [Rpc.Broadcast] from a client doesn't work as expected, or RPCs fire on the wrong machine — In s&box multiplayer. Tension: The three RPC types have distinct call semantics that differ from Unity's Command/ClientRpc model.

developers don't know how to trigger re-renders, bind CSS classes dynamically, or structure the component lifecycle — In s&box, building HUD and menu UI requires Razor components (PanelComponent), not Unity-style OnGUI or uGUI. Tension: BuildHash() is the key re-render trigger that many miss.

changing scenes (loading a new level) requires Game.ChangeScene() on the host, not Scene.Load() or any Unity-style SceneManager equivalent — In s&box. Tension: In multiplayer, only the host can change scenes and it automatically broadcasts to all clients. Developers also don't know how to pass data between scenes. Outcome: Use Game.ChangeScene() to transition between scenes.

Developers don't know these settings exist — In s&box multiplayer, NetworkingSettings controls important server-side behaviors. Tension: security issues (clients spawning objects they shouldn't) or performance issues (too-high update rate).

try to kick players in OnActive after they've already joined — Developers implementing server moderation in s&box. Tension: store bans in memory only (lost on restart). Outcome: The correct approach uses INetworkListener.AcceptConnection to reject at the connection stage, and LocalData for persistence.

Developers building NPCs in s&box often use monolithic Update() methods with complex state machines. — in s&box. Tension: This becomes hard to extend and debug. Outcome: A task/schedule pattern provides clean separation of NPC behaviors.

Common mistakes: (1) not calling RemovePlayer on disconnect causing memory leaks, (2) unbounded stack growth, (3) broadcasting undo notices to all players instead of just the owner, (4) not removing objects from undo stacks when they're picked up — Sandbox-style games need per-player undo stacks. Tension: allowing players to undo weapons out of other players' hands.

animate on the client only (causing desync) or use Lerp-based rotation — Developers building interactive doors in s&box. Tension: doesn't support custom easing. Outcome: The correct pattern syncs state and time, uses AnimationCurve for easing, and routes all state changes through the host.

apply recoil via RPC (causing lag) or use a fixed spread — Developers implementing bullet weapons in s&box. Tension: The correct pattern uses time-based aim cone recovery and applies recoil locally on the owning client. Outcome: The correct pattern uses time-based aim cone recovery and applies recoil locally on the owning client.

Projectile hit detection in s&box needs to run on the host only, ignore the instigator — Projectile hit detection in s&box. Tension: use ICollisionListener (not trigger volumes). Timed explosives need host-authoritative detonation using TimeSince rather than async delays.

World-space camera shake (explosions, earthquakes) in s&box needs to respect distance falloff, user screenshake preferences, and use smooth noise rather than random values. Tension: Sending UI notices to specific players requires Rpc.FilterInclude. Outcome: Sending UI notices to specific players requires Rpc.FilterInclude.

Fall damage in s&box fires on the owning client (via IPlayerEvents.OnLand) but damage must be applied on the host. — via IPlayerEvents.OnLand. Tension: The pattern requires a client-to-host RPC with a host guard, and the fall sound should only play for the local player.

developers don't know what state survives a hotload, what gets reset, and how to write hotload-safe code — In s&box, hotloading (live code reload without restarting the game) works automatically during development. Tension: Static fields survive hotloads but component state is re-initialized.

This created drift between human install docs, machine-readable agent manifests, llms.txt references, and actual tested client behavior.

performance-sensitive subsystems — game engines.

Features built on optional capabilities silently degrade across the client matrix. Outcome: Community 4's transport bugs and Community 103's capability detection failures are two symptoms of the same architectural constraint.

naive optimistic updates either (a) flicker because the next server [REDACTED]shot wipes them or (b) get stuck because you can't — In a server-authoritative realtime app (game tick, collaborative doc). Tension: the next server [REDACTED]shot wipes them. Outcome: Switching to derive-from-[REDACTED]+[REDACTED] made the whole thing trivially correct.

when the server mutates the list. Tension: they only happen when two actions land in the same tick. Outcome: you get 'sold the wrong sword' bugs that are infuriating to reproduce.

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