Fivem Development

FiveM Development — Best Practices

Framework-agnostic orchestrator. One skill — load reference files on demand (do not load all).

Language rule: Internal reasoning is in compact English. All messages and output displayed to the user must be in the user's language.

Philosophy

1. Fetch, don't memorize — When unsure about a native or API, verify from authoritative sources
2. Framework-agnostic thinking — Understand patterns, adapt to the active framework
3. Performance-first — FiveM has strict tick budgets
4. Security-aware — Server-side validation is non-negotiable
5. Clean, readable Lua over abstraction — Monolith-first (server.lua / client.lua), minimal comments, extract local function only when reused (2+ call sites; §3.11). Do not componentize Lua like React or invent event roundtrips when Tunnel/return fits.
6. Project memory — reference.mdc = lean global map (alwaysApply); .fxmind/memory/<topic>.md = shared compact recipe. Run /fxmind learn before rescanning; /fxmind memory health; /fxmind graph; /fxmind query.
7. Audit assertiveness — /fxmind audit follows performance.md §1.6.1–§1.6.2 + §2.4–§2.5 (Pass 2b E-a…E-g, Pass NUI N-a…N-d when ui_page) + security.md §5.1.
8. Quality gates (task mode) — implementing or refactoring code follows quality-gates.md: design review at Gate A, self-review loop before Gate V.

Reference router (load only what you need)

Corrections backlog (.fxmind/corrections/) categories map 1:1 to these files — promote rules into the matching file, not into a new skill.

CRITICAL: No Hallucination Policy

NEVER invent or guess native functions, framework APIs, or parameters.

1. If unsure about a native → MUST fetch from https://docs.fivem.net/natives/
2. If unsure about framework API → MUST fetch from official docs or read the framework skill
3. If function doesn't exist → Tell user honestly, suggest alternatives
4. If parameters unknown → Fetch documentation, don't guess

Before writing any native or API call: verify name, parameters, and client/server availability.

Dynamic Documentation Fetching

Use local skills first. Fetch online only when information is missing, outdated, or uncertain.

Request Router

Before Writing Lua

1. READ architecture.md §3.5–3.6 and style.md §3.7–3.11
2. Task mode: read quality-gates.md — fill Gate A QUALITY plan; run self-review loop before Gate V
3. Default to one server.lua and one client.lua unless split is clearly justified
4. Prefer Tunnel/return over event roundtrips — communication.md §1.1

Critical Performance Rules

1. Callback vs Event: Use TriggerServerEvent/TriggerClientEvent when you do NOT need a return. Use callbacks/Tunnel only when you NEED a return.
2. Dynamic Sleep: NEVER fixed Wait(0). Adjust based on state.
3. Same environment: Call functions directly — never TriggerEvent() same-side.
4. No remote calls in loops < 5s — batch or delta.
5. Small payloads — ~8KB limit; send deltas.
6. Cache: exports["cacheaside"]:Get() for repeated DB queries.
7. Large sync: cerberus SendFullSync / SendDeltaSync.
8. SafeEvent + server validation for money/items/XP/vehicles.
9. SetCooldown on client before spammy TriggerServerEvent.
10. Server security: never trust client/NUI; resolve derived data on server (§5.2).
11. Tables > if/else for 3+ conditions; protect nil.
12. Consolidate network: one Tunnel call with return (§1.1).

Framework Skills

See framework-detection.md.

Resource Structure

Prefer monolith — architecture.md §3.5.

resource_name/
├── fxmanifest.lua
├── shared/config.lua
├── server/server.lua
└── client/client.lua

Anti-Patterns (short)

Full tables: style.md §3.10–§3.11, architecture.md §3.6.

External Resources

• cacheaside: git@github.com:proelias7/cacheaside.git
• cerberus: git@github.com:proelias7/cerberus.git

Natives

• https://docs.fivem.net/natives/
• Mirror: https://github.com/proelias7/fivem-natives