Compatibility is not only whether a script starts. It is whether it agrees with the rest of your stack when real players use it. A resource can boot with zero console errors and still corrupt inventories, double pay wages, or silently overwrite another script's database rows the first busy night. The failures that end launches are almost never the loud ones you catch in a solo test. They are the quiet disagreements between two scripts that each work perfectly on their own.
This is the audit we run before any server we advise adds a new purchase to its build. It moves from the cheapest checks to the most expensive, so you stop the launch-breakers before you spend an evening chasing a bug that a version number would have predicted.
Why compatible-looking scripts still break
Every FiveM script assumes a world around it: a framework, a set of shared libraries, a database shape, and an owner over each part of the player experience. Two scripts conflict when they assume the same world differently. One expects ox_inventory, the other ships its own inventory and registers the same item names. Both want to own the money balance. Both write to a players table with a different column layout. Nothing errors at boot because each is internally consistent. The disagreement only surfaces when a player triggers both at once.
Most broken launches are not missing features. They are two working scripts fighting over the same job, the same table, or the same item.
The compatibility audit order
Run these in order. Each step is cheaper to check than the one below it is to debug after launch.
1. Framework and dependency versions
Confirm the script targets your framework and version: ESX legacy versus 1.x, QBCore versus QBox, and the exact release, not just the name. Then confirm its dependencies. Most modern resources expectox_lib, and many expect ox_inventory, oxmysql, or a specific target system. A script written for ox_inventory will not find items in a server still running qb-inventory, and no amount of config fixes that mismatch.
2. Exports, events, and shared resources
Read the script for the exports and events it calls into other resources. If it fires esx:getSharedObject or calls an export on a resource you renamed or do not run, it fails at the moment a player uses that path, not at startup. List every external event and export it depends on, then confirm each one exists in your build under the exact name.
3. Database ownership and migrations
Open the SQL the script ships. Check which tables it creates, which it alters, and which it assumes already exist. The dangerous case is a script that adds columns to a shared table such as playersor owned_vehicles, or that stores state a second script also writes. Back up the database before you import any migration, and never run an ALTER TABLE from an untrusted resource on a live database without reading it first.
4. Gameplay overlap under real players
Map the new script against what already owns each system. Does it add a second inventory, a competing job menu, a parallel phone, or its own target system next to ox_target? Overlap is not always fatal, but it has to be a deliberate choice, not a surprise you discover when a player stores an item in one inventory and cannot find it in the other.
5. Logs under realistic actions
Read the client, server, and database logs while you exercise the script the way a player would: buy, sell, die, respawn, relog, trade, and do it while a second account does the same. Concurrency, permission edge cases, and database load reveal the problems a single quiet test never will.
A repeatable pre-launch test pass
Turn the audit into a script you run every time you add a resource. Start the server clean, read the full startup log in txAdmin before connecting, then run a two-account session that touches every system the new resource shares. If the log is clean, the data is intact after a relog, and no existing feature regressed, the resource has earned its place in the build. If any of those fail, it goes back out until the conflict is resolved, not patched over.
