Game Function Tester - Mod Development Tool - CET Scripting Helper
🟡 Updated this year⚠️ Install Order · 7 steps
Install in this order, then this mod last — most mods fail to load without their framework and dependencies in place.
Preview

🔍 Analysis
- 👍 1.4% endorsement rate — high engagement, a strong quality signal
- 🏆 #11 of 49 Utilities mods in this game by downloads
📋 About This Mod
What is this?
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[]A tool to enter a game function/method call into a text field, then watch as it updates it's values in real-time while you play...
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]Saves last function/method entered to restore on game launches[]When entering a new function call to check, you need to press the "Update Function" button, then press the "Reload All Mods" button in CET's main overlay menu... It will then continually check and output the returned value of that function until you update the function and reload mods again...
[]Can check up to 4 game functions at a time (with drop-down menu to select how many you'd like to check)
[]Supports hiding the mod window in CET overlay using my CET Mod Window Hider Tool
Installation:
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[]Extract to main CP77 install folder or install with Vortex
Uninstallation:
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[]Delete the "GameFunctionsTester-CET" folder from your folder
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[]This will log a lot of errors in the mod's log (in the mod's folder), especially if you check a lot of improper/wrong functions, but you will likely get some errors logged no matter what... These logs should be ignored... If you experience crashes or issues when checking a particular function, just delete the 'helper.lua' file from the mod's folder and relaunch the game (and don't check that function again...lol)... This should never cause crashes or anything while the overlay is closed, though, as the script does absolutely nothing (aside from setting a few flag variables) without it being opened...
To Do:
[]Add support for checking the state of multiple functions/methods at a time (separate text fields with labeled outputs)... Done in v1. 1
[]Add support to hide the window with my CET Mod Window Hider Tool... Done in v1. 1
[]Possibly add support to write and execute entire functions instead of what are basically just console commands (though with the right formatting, anything is possible to do as a command)... Just gotta figure out a good way to implement it (currently thinking a separate tab in the window)... Edit: This likely isn't going to happen, as after some testing
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[]Delete the "GameFunctionsTester-CET" folder from your folder
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[]Extract to main CP77 install folder or install with Vortex
Game Function Tester is a Cyber Engine Tweaks (CET) utility that lets you inspect the return values of game functions and methods in an overlay window, accessible via CET or a custom keybind. It's a developer-focused tool for modders debugging scripts, with 315 endorsements and recent updates.
✨ Key Features
📊 Pros & Cons
✅ Pros
- Recent update (Sept 2025) means it's likely compatible with current Cyberpunk 2077 patches.
- Solid community trust with 315 endorsements and over 22k downloads.
- Essential for modders who need to debug script calls without digging through logs.
⚠️ Cons
- Niche tool—only useful if you're actively developing or debugging mods.
- Requires Cyber Engine Tweaks (CET) installed, which is a separate dependency.
- No detailed usage instructions in the description—you'll need to figure out the overlay yourself.
For Cyberpunk 2077 mod developers who need to inspect function return values while scripting. Also handy for advanced users who want to peek under the hood. Skip if you're just playing the game—this is a dev tool, not a gameplay mod.
💡 Beginner Tips
- Make sure CET is installed and up-to-date before using this mod—it's a hard dependency.
- Bind a custom key in CET settings to open the overlay quickly while testing.
- Use the overlay to verify function outputs in real-time, which beats guessing from logs.
📊 Mod Details
- Game
- Cyberpunk 2077 Mods
- Author
- TheManualEnhancer
- Version
- 1.9
- Downloads
- 22,696
- Endorsements
- 315
- Category
- Utilities
- Created
- 2/20/2024
- Updated
- 9/22/2025
🔧 How to Install Cyberpunk 2077 Mods
Download from Nexus.
📖 Full step-by-step install guide for Cyberpunk 2077 →
Visit the official mod page for specific installation instructions for this mod.
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