# The AI Game Dev Kit

> Curated game development tools an AI coding agent can drive, scored 0 to 18 on 6 checks (0 to 3 each): MCP or agent integration; Headless, CLI or API; Text project files; Docs and llms.txt; Open source or free tier; Active in 2026. Full data with per-check scores: https://kit.flodoc.ai/tools.json

## Engines

- [Godot](https://godotengine.org/): Scenes (.tscn) and GDScript are plain text an agent edits directly, and the editor runs headless for builds and tests. AI score 16/18. Free.
- [three.js](https://threejs.org/): The default 3D library for the web; huge example corpus means agents rarely guess. AI score 16/18. Free.
- [Bevy](https://bevy.org/): Code-only Rust ECS engine: the whole game is source files, and the compiler checks agent edits. AI score 15/18. Free.
- [Defold](https://defold.com/): Small 2D-first engine with text collection files, Lua scripts and the bob.jar command line builder. AI score 15/18. Free.
- [Phaser](https://phaser.io/): HTML5 game framework in plain JS or TS, the language agents write best, with instant browser preview. AI score 14/18. Free.
- [LÖVE](https://love2d.org/): Tiny Lua 2D framework: a game is a folder of .lua files, run with one command. AI score 14/18. Free.
- [Unity](https://unity.com/): Biggest asset and tutorial ecosystem; batchmode builds and strong community MCP bridges make it agent-workable. AI score 12/18. Free tier.
- [Unreal Engine](https://www.unrealengine.com/): Top-end 3D with editor Python scripting and commandlets; agents work through MCP bridges since assets are binary. AI score 12/18. Free tier.

## Engine MCP bridges

- [Godot MCP](https://github.com/Coding-Solo/godot-mcp): Lets an agent launch the Godot editor, run the project and read debug output, closing the edit and test loop. AI score 15/18. Free.
- [Unity-MCP (AI Game Developer)](https://github.com/IvanMurzak/Unity-MCP): Unity MCP plus CLI and runtime tools; any C# method becomes an agent tool with one attribute. AI score 15/18. Free.
- [Blender MCP](https://github.com/ahujasid/blender-mcp): Agent runs Python inside live Blender, pulls Poly Haven assets and calls Hyper3D generation. AI score 15/18. Free.
- [Blockbench MCP](https://github.com/jasonjgardner/blockbench-mcp-plugin): Plugin that exposes Blockbench modeling, texturing and animation to MCP clients. AI score 15/18. Free.
- [Unity MCP](https://github.com/CoplayDev/unity-mcp): Bridge from Claude, Cursor and others into the Unity Editor: scenes, assets, scripts and console. AI score 14/18. Free.
- [Unreal MCP](https://github.com/ChiR24/Unreal_mcp): MCP server plus a native C++ automation bridge: agents spawn actors, edit Blueprints and run the editor. AI score 14/18. Free.
- [Aseprite MCP](https://github.com/diivi/aseprite-mcp): Lets an agent draw, fill and export sprites through Aseprite's Lua API. AI score 14/18. Free.
- [RenderDoc MCP](https://github.com/JiaboLi-GitHub/renderdoc-mcp): Hands GPU frame captures to an agent: draw calls, state and resources, for rendering bugs. AI score 13/18. Free.

## AI coding agents

- [Codex CLI](https://github.com/openai/codex): Open source terminal agent from OpenAI with MCP client support and sandboxed command runs. AI score 17/18. Free tier.
- [Gemini CLI](https://github.com/google-gemini/gemini-cli): Open source terminal agent with a generous free quota, large context and MCP support. AI score 17/18. Free tier.
- [Claude Code](https://www.anthropic.com/claude-code): Terminal agent that edits whole projects, runs the headless engine and connects to any MCP bridge above. AI score 16/18. Paid.
- [GitHub Copilot](https://github.com/features/copilot): Agent mode in VS Code and Rider plus a cloud coding agent that opens PRs; MCP capable. AI score 15/18. Free tier.
- [Cursor](https://cursor.com/): AI code editor with agent mode, MCP servers and a CLI agent; good for C# and C++ engine code. AI score 14/18. Free tier.

## 3D

- [Blender](https://www.blender.org/): Full 3D suite with a complete Python API and `blender -b` headless mode; the most agent-drivable DCC. AI score 14/18. Free.
- [Blockbench](https://www.blockbench.net/): Low-poly and voxel-style modeler whose .bbmodel files are readable JSON. AI score 14/18. Free.
- [Meshy](https://www.meshy.ai/): Text and image to textured 3D models over a REST API, with an official MCP server. AI score 13/18. Free tier.
- [Tripo](https://www.tripo3d.ai/): Fast image to 3D with auto rigging, an API and an official MCP server. AI score 12/18. Free tier.
- [Hyper3D Rodin](https://hyper3d.ai/): High quality text and image to 3D; built into Blender MCP so agents can generate in-scene. AI score 11/18. Free tier.
- [Higgsfield 3D](https://higgsfield.ai/): Image to GLB generation plus image and video models, all behind one official MCP server. AI score 11/18. Free tier.

## 2D and pixel

- [Aseprite](https://www.aseprite.org/): The pixel art and sprite animation standard, with a batch CLI, Lua scripting and JSON sheet export. AI score 13/18. Paid.
- [PixelLab](https://www.pixellab.ai/): AI pixel art: characters with directional views, animations and tilesets, via API and MCP. AI score 13/18. Free tier.
- [Pixelorama](https://pixelorama.org/): Open source pixel editor built in Godot, with command line export. AI score 11/18. Free.
- [LibreSprite](https://libresprite.github.io/): Free GPL fork of old Aseprite with the same batch CLI basics and JavaScript scripting. AI score 10/18. Free.

## Animation

- [Spine](https://esotericsoftware.com/): 2D skeletal animation with JSON skeleton data and a command line exporter. AI score 11/18. Paid.
- [Rive](https://rive.app/): Interactive vector animation with state machines, runtimes for Unity, Unreal and the web. AI score 9/18. Free tier.
- [Cascadeur](https://cascadeur.com/): Physics-assisted keyframe animation with AutoPosing and a Python API. AI score 7/18. Free tier.
- [Mixamo](https://www.mixamo.com/): Free auto rigging and a large mocap clip library for humanoids; still the fastest rig for prototypes. AI score 4/18. Free.

## Audio

- [earshot](https://github.com/Leonxlnx/earshot): Gives coding agents ears: MCP tools that describe, rank, measure and critique sound, CPU only. AI score 16/18. Free.
- [ElevenLabs Sound Effects](https://elevenlabs.io/sound-effects): Text to sound effects and voice over an API, with an official hosted MCP server (OAuth, nothing to install). AI score 13/18. Free tier.
- [Freesound](https://freesound.org/): Huge Creative Commons sound library with a search and download API; filter to CC0. AI score 11/18. Free.
- [jsfxr](https://sfxr.me/): Retro sound effect generator whose sounds are small parameter strings an agent can write. AI score 10/18. Free.
- [Sonniss GDC Bundle](https://sonniss.com/gameaudiogdc/): Yearly multi-gigabyte pack of pro game SFX, royalty free for commercial use. AI score 5/18. Free.

## Level design

- [Tiled](https://www.mapeditor.org/): 2D tile map editor with XML or JSON maps, CLI export and a JavaScript scripting API. AI score 15/18. Free.
- [LDtk](https://ldtk.io/): Modern 2D level editor from the Dead Cells director; one JSON file with a published schema. AI score 13/18. Free.
- [func_godot](https://github.com/func-godot/func_godot_plugin): Imports TrenchBroom .map files into Godot scenes, so text levels become playable geometry. AI score 13/18. Free.
- [TrenchBroom](https://trenchbroom.github.io/): Brush-based 3D level editor; Quake .map files are plain text geometry. AI score 12/18. Free.

## Godot add-ons

- [Phantom Camera](https://phantom-camera.dev/): Cinemachine-style cameras for Godot: follow, framing and blends set as node properties. AI score 13/18. Free.
- [LimboAI](https://github.com/limbonaut/limboai): Behavior trees plus hierarchical state machines for Godot NPCs, with a visual debugger. AI score 13/18. Free.
- [Dialogue Manager](https://github.com/nathanhoad/godot_dialogue_manager): Branching dialogue written in a screenplay-like .dialogue text format agents can author. AI score 13/18. Free.
- [Maaack's Game Template](https://github.com/Maaack/Godot-Game-Template): Main, pause and options menus, loading screens and input rebinding as plain scenes, the shell every build needs. AI score 13/18. Free.
- [ProtonScatter](https://github.com/HungryProton/scatter): Procedural placement of props, grass and rocks along shapes, defined as stacked text resources. AI score 12/18. Free.
- [Beehave](https://github.com/bitbrain/beehave): Node-based behavior trees in pure GDScript; trees live in the scene file. AI score 12/18. Free.
- [Dialogic 2](https://github.com/dialogic-godot/dialogic): Timeline editor for characters, portraits and events; timelines save as readable text. AI score 12/18. Free.
- [Terrain3D](https://github.com/TokisanGames/Terrain3D): High performance editable terrain for Godot in C++, with a GDScript API for generation. AI score 11/18. Free.
- [Juicee](https://github.com/Kelpekk/Juicee): Game feel graphs for Godot: hit-stop, flashes, punches and shakes without hand-written tweens. AI score 11/18. Free.
- [Debug Draw 3D](https://github.com/DmitriySalnikov/godot_debug_draw_3d): One-line calls to draw rays, paths and volumes in game, so agents can make their logic visible in screenshots. AI score 10/18. Free.
- [Godot VAT plugin](https://github.com/antzGames/Godot_Vertex_Animation_Textures_Plugin): Vertex animation textures on MultiMesh: hundreds of animated characters in one draw call. AI score 9/18. Free.

## Asset libraries

- [Poly Haven](https://polyhaven.com/): CC0 HDRIs, PBR textures and models with a public API, already wired into Blender MCP. AI score 14/18. Free.
- [ambientCG](https://ambientcg.com/): CC0 PBR materials and HDRIs with a JSON API for scripted downloads. AI score 11/18. Free.
- [Poly Pizza](https://poly.pizza/): Searchable low-poly model library with an API; searchable from Blender MCP setups. AI score 9/18. Free.
- [Kenney](https://kenney.nl/assets): Tens of thousands of consistent CC0 sprites, models, UI and audio; perfect placeholder to ship quality. AI score 8/18. Free.
- [Quaternius](https://quaternius.com/): CC0 low-poly packs with rigged and animated characters in glTF and FBX. AI score 6/18. Free.
- [OpenGameArt](https://opengameart.org/): Long-running community library of free 2D, 3D and audio assets under open licenses. AI score 5/18. Free.

## Testing and perf

- [GdUnit4](https://github.com/MikeSchulze/gdUnit4): Godot test framework with scene runners, input simulation, C# support and a CI action. AI score 14/18. Free.
- [GUT](https://github.com/bitwes/Gut): Godot unit testing in GDScript, runnable from the command line so agents can verify their own edits. AI score 13/18. Free.
- [RenderDoc](https://renderdoc.org/): Standard GPU frame debugger with a Python API and command line capture. AI score 13/18. Free.
- [Tracy](https://github.com/wolfpld/tracy): Frame profiler for CPU, GPU and memory, with capture and CSV export tools for headless runs. AI score 11/18. Free.