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Core Library

Supercharge your own creations with scripting capabilties, without the scripting.
1.37.2 Updated November 23, 2025
Base Game Compatible

About Core Library

For Players

Core Library is a dependancy for many mods to add gameplay functionality without overriding each other. It helps reduce conflicts and the need for redundant scripts.

For Creators

Core Library includes reusable snippets to perform common tuning injections and add other functionality to your tuning only mods without the need for you to script.

If you are developing your own scripts you can use Core Library to easily setup loggers, config files, or even game services. An event system is included so you can run code on zone load and unload and many other events without adding additional injection points that could otherwise cause conflicts with other mods.

View the Source on Github →

Suite Life Keychains

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A silver key ring is attached, a holographic Lot 51 sticker and Hotel Build Guide are included!

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Download • Download • Download •
1.37.2 Released November 23, 2025 • lot51_core_v1.37.2.zip

Installation Notes

Unzip and place the ts4script in your Mods folder. Make sure you only have ONE copy at a time.

Double check that your unzipped script does not end with a number in the case your destination folder had an existing file with the name — otherwise the script will not load.

If you organize your CC, make sure scripts are not placed more than one folder deep.

See Mod Installation Guide →

PSA: In-Game Pack Selection Feature

If the new Pack Selection feature is used, you MUST restart your game to get it back in a safe state for Core Library to run. Some changes will say you don't need a restart, but do it anyway.

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Players: Received an exception using Core Library? Trying to find a conflict?

Core Library does not do anything on its own. If you are experiencing an issue in game and it goes away when removing Core Library then you need to keep the library installed and 50/50 the other mods. 

Please contact the creator of those mods to report the issue. If there is an issue with library itself then the creator can contact me.

Get Mod Support on Discord

Please do not request mod support in contact forms, direct messages or Patreon comments. Due to the demand, I can no longer do this on my own.

Join the Discord community and upload your exception files with your lot51_core.log file or other related mod logs like lot51_hotels.log for Suite Life, etc. in the #mod-support channel.

Bot 51 is our new automated helper who is tuned specifically for Lot 51 mods. You'll get an immediate audit with solutions to detected issues.

If the bot can't detect any issues, someone from our smol human support team will try to help as soon as they are able to. Please be respectful as we may be in a different time zone and we do this in our free time.

If you need help with a non-Lot 51 mod including those that use Core Library please contact those creators, or use a general help server like Sims After Dark or Deaderpool instead.

Core Library Documentation

Tuning Injector Snippet

Inject to Interactions, Traits, Buffs, even Social Bunny without any scripting. There are many things you can do with this one snippet! View the TDESC for detailed information. Open in Tuning Builder

Purchase Picker Snippet

This is an advanced snippet to create Purchase Pickers with stock management + discounts, and can generate rows from definitions, tags, or recipes! Open in Tuning Builder

LotFiftyOneCoreLootActions Tuning

A set of custom loot actions that provide new functionality, or more advanced alternatives to EA loot actions. This includes opening a PurchasePickerSnippet above. Open in Tuning Builder

Affordance Lock Out Snippet

A snippet to provide lockout functionality to SuperInteractions similar to Mixers. Once a Sim runs an interaction either autonomously or user-directed, the interaction will not be allowed to run for the interval provided. Open in Tuning Builder

Clear Mod Save Data Commands (1.34+)

Some mods (like Suite Life) may use the Core Library Save Based Config system which stores data in a household allowing it to be carried and modified per-save. You can use the following commands to purge that data and start fresh.

Core Library 1.37.2

November 23, 2025
  • Fixed object injectors failing in certain conditions due to an addition in 1.37.
  • (1.37.2: Rerolled with Plumbuddy manifest)

Download Release

Core Library 1.37

October 30, 2025
  • Fixed backwards compatibility with game version <= 1.116 that regressed in Core version 1.36.

  • Added inject_to_skills injector to add loot, super affordances, and actor mixers to a Skill's level data.

  • You can now add custom_tooltips to existing tooltip_components in object injectors with tooltip_component instead of tooltip_component_override.

TDESCs will be updated soon.

Download Release

Core Library 1.36