Create: SchematicChecker

Create: Schematic Checker (CSC)

Create: Schematic Checker is a server-side protection mod for Create schematics. It scans uploaded schematics and blocks or sanitizes known malicious NBT patterns before they can be printed into a world.

CSC is designed for public and survival servers that allow schematic uploads. It protects against known Create schematic exploits such as item duplication, creative-item acquisition, server lag, crashes, malformed contraptions, and dangerous addon NBT.

Support

• Discord: https://discord.gg/rQV5JPauY7

What It Does

• Scans schematics asynchronously, without blocking the Minecraft server main thread.
• Detects and blocks known malicious Create schematic exploits.
• Sanitizes configurable NBT fields, tags, blocks, items, and entities.
• Validates Create belts, chain drives, mechanical arms, filters, fluid tanks, clipboards, and other high-risk block entities.
• Supports custom local rules through config/CSC/user_rule.json.
• Can optionally sync online rule updates when enabled by the server owner.
• Keeps logs and optional schematic backups for auditing and later investigation.

Supported Versions

Choose the build that matches both your Minecraft version and Create version.

| Loader | Minecraft | Create target | | --- | --- | --- | | Forge | 1.14.4 | 0.2.3 | | Forge | 1.15.2 | 0.3.1 | | Forge | 1.16.5 | 0.3.2g | | Forge | 1.17.1 | 0.4 | | Forge | 1.18.2 | 0.5.1i | | Forge | 1.19.2 | 0.5.1i | | Forge | 1.20.1 | 0.5.1j | | Forge | 1.20.1 | 6.0.x | | Fabric | 1.18.2 | 0.5.1i | | Fabric | 1.19.2 | 0.5.1i | | Fabric | 1.20.1 | 6.0.x | | Fabric | 1.21.1 | 6.0.x | | NeoForge | 1.21.1 | 6.0.x |

Dependencies

• Minecraft
• Create

Some builds may require loader-specific Create dependencies such as Flywheel, Ponder, or Registrate, depending on the target Minecraft/Create version.

Installation

1. Download the CSC jar for your loader, Minecraft version, and Create version.
2. Put the jar into the server mods folder.
3. Start the server once to generate config/CSC/config.toml.
4. Review the generated configuration before opening schematic uploads to players.
5. Use /csc reload after editing the config.

Configuration

Main config file:

config/CSC/config.toml

Important options:

| Option | Purpose | | --- | --- | | core.Enable | Enables or disables CSC checks. | | core.BanBlock | Blocks or sanitizes high-risk blocks and items. | | core.BanTag | Removes or blocks dangerous NBT tags. | | core.KillEntity | Removes entities from schematics to prevent entity-based exploits. | | core.WhiteListModEnable | Allows only listed mod IDs to keep NBT. Recommended for public servers. | | debug.EnableBackup | Saves uploaded schematics for later auditing. Recommended. | | online.enableAutoUpdate | Allows CSC to fetch cloud rule updates. Disabled by default. | | online.enableManualConfig | Enables custom rules from config/CSC/user_rule.json. |

Manual custom rule file:

config/CSC/user_rule.json

Online cached rules:

config/CSC/online/

Commands

| Command | Description | | --- | --- | | /csc | Shows basic status. | | /csc help | Shows help and feedback links. | | /csc reload | Reloads CSC configuration and rules. | | /csc list | Shows rule-list help. | | /csc list IdMatchRuleAll | Lists all ID match rules. | | /csc list OperateMatchRuleAll | Lists all NBT operation rules. | | /csc DisableTemp | Temporarily disables checks for 5 minutes. | | /csc Enable | Restores CSC after temporary disable. | | /csc notice whitelistid on|off | Toggles whitelist-mode scan notice. | | /csc mode whitelistid on|off | Toggles mod ID whitelist mode. |

Known Exploit Coverage

CSC covers many reported Create schematic vulnerabilities and addon-specific NBT exploits.