URKit

URKit is a native C++ modding toolkit for Windows x64 Unity games. It supports Mono and IL2CPP through one loader ABI, and gives you Unity object access, managed method calls, hooks, lifecycle callbacks, networking, and an ImGui overlay, generated straight into a buildable CMake project.

What's in a release

• urk-sdk.exe: generates a Mono or IL2CPP mod project.
• urk-updater.exe: updates a generated project without touching your own files.
• version.dll, winhttp.dll, winmm.dll: proxy loaders. Install the one the game actually imports.
• URKitInjector.dll: a proxy-free loader for manual injection workflows.
• urk-dev-mcp.exe + URKitDevBridge.dll: optional MCP server for AI coding assistants (build, deploy, runtime diagnostics).

Put the proxy DLL next to the game executable, and built mods in the game's Mods directory. Only install one proxy, and don't rename it.

Quick start

./urk-sdk.exe --game-exe C:\Games\Example\Example.exe --backend auto --name MyMod
cd <GameDir>\urk-sdk-output\MyMod\project
cmake --preset clang-debug
cmake --build --preset clang-debug --parallel

That builds a debug DLL and drops it in the game's Mods directory. You need CMake 3.28+, Ninja, and either LLVM/Clang or the MSVC toolchain (VS 2022 Build Tools or newer). Use clang-release / msvc-release when you're ready to ship, and msvc-debug if you'd rather build with cl.exe.

Launch the game and check URKit_logs.log next to the executable. You should see the mod initialize. If that file doesn't exist, the game isn't importing the proxy you installed.

Learn the API

New to URKit? Start with Getting Started. It walks through writing an actual mod, from "hello log" to reading and changing game state, step by step.

For a video walkthrough, check out the URKit SDK Tutorial Series.

Once you know the basics, docs/SDK_HANDBOOK.md is the full reference: object search, threading rules, hooks, the render/highlight pipeline, caching, and a diagnostics chapter for when something doesn't work. ARCHITECTURE.md covers how URKit itself is put together, and docs/DEV_MCP.md covers the AI-assistant MCP server.

Updating an existing project, migrating a hand-patched SDK, or automating the updater from a script: that's all in the handbook's first chapter.

Security software and false positives

The proxy loaders and URKitInjector.dll load into a game process and can install API hooks, which is normal mod-loader behavior, but it can trip antivirus heuristics. A detection alone doesn't mean a release is malicious.

Only download releases from this repository, and check the published SHA-256 digest. Release binaries are self-signed for tamper identification, not as a trust signal: Windows won't trust that certificate by default. Don't disable your antivirus to run URKit. If you get a false positive, report it to the vendor (or open an issue here) with the detection name, the file, and its SHA-256 digest.

URKit is available under the MIT License.