What Client & Server proves
It indicates the project is intended for both sides. It does not prove compatibility with every hosting panel, proxy, modpack, AI provider, or other mod.
Match matrix
A multiplayer launch is only valid when these fields agree.
AI and secret handling
Determine whether the selected project expects the provider on the server or client before adding a key. Never distribute a shared API key inside a public modpack or ask players to paste it into a website.
Isolation test
Start with Verity and its required dependencies in a clean server. Join with one matching client, create a disposable world, test the documented behavior, then add other mods in small batches.
Evidence to capture
Record project ID, release, game version, loader build, dependency versions, host, server log, and whether failure occurs at startup, join, world load, entity behavior, or AI response.
Questions
Does Client & Server mean every player can join without the mod?
No. Follow the exact project's requirements; in a modded environment clients commonly need matching loader, mod, and dependencies.
Can one API key be bundled for all players?
Do not distribute a secret in a pack. Verify where the project expects provider configuration and keep credentials private.