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I’ve been working on this for about a year through four major rewrites. Godogen is a pipeline that takes a text prompt, designs the architecture, generates 2D&#x2F;3D assets, writes the GDScript, and tests it visually. The output is a complete, playable Godot 4 project.Getting LLMs to reliably generate functional games required solving three specific engineering bottlenecks:1. The Training Data Scarcity: LLMs barely know GDScript. It has ~850 classes and a Python-like syntax that will happily let a model hallucinate Python idioms that fail to compile. To fix this, I built a custom reference system: a hand-written language spec, full API docs converted from Godot&#x27;s XML source, and a quirks database for engine behaviors you can&#x27;t learn from docs alone. Because 850 classes blow up the context window, the agent lazy-loads only the specific APIs it needs at runtime.2. The Build-Time vs. Runtime State: Scenes are generated by headless scripts that build the node graph in memory and serialize it to .tscn files. This avoids the fragility of hand-editing Godot&#x27;s serialization format. But it means certain engine features (like `@onready` or signal connections) aren&#x27;t available at build time—they only exist when the game actually runs. Teaching the model which APIs are available at which phase — and that every node needs its owner set correctly or it silently vanishes on save — took careful prompting but paid off.3. The Evaluation Loop: A coding agent is inherently biased toward its own output. To stop it from cheating, a separate Gemini Flash agent acts as visual QA. It sees only the rendered screenshots from the running engine—no code—and compares them against a generated reference image. It catches the visual bugs text analysis misses: z-fighting, floating objects, physics explosions, and grid-like placements that should be organic.Architecturally, it runs as two Claude Code skills: an orchestrator that plans the pipeline, and a task executor that implements each piece in a `context: fork` window so mistakes and state don&#x27;t accumulate.Everything is open source: <a href="https:&#x2F;&#x2F;github.com&#x2F;htdt&#x2F;godogen" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;htdt&#x2F;godogen</a>Demo video (real games, not cherry-picked screenshots): <a href="https:&#x2F;&#x2F;youtu.be&#x2F;eUz19GROIpY" rel="nofollow">https:&#x2F;&#x2F;youtu.be&#x2F;eUz19GROIpY</a>Blog post with the full story (all the wrong turns) coming soon. Happy to answer questions.

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