Godot Forge

The MCP server for Godot 4 — test runner, API docs, script analysis, and more.

AI coding assistants are structurally bad at GDScript. Models trained on data skewed towards Godot 3 hallucinate deprecated APIs — yield instead of await, KinematicBody instead of CharacterBody3D, export var instead of @export var. Godot Forge fixes this.

8 tools. Zero config. Works with every MCP-compatible IDE.

Install

npx -y godot-forge

That's it. Godot Forge auto-detects your Godot binary (Steam, Homebrew, direct download) and finds your project.godot automatically.

Add to your IDE

claude mcp add godot-forge -- npx -y godot-forge

{
  "mcpServers": {
    "godot-forge": {
      "command": "npx",
      "args": ["-y", "godot-forge"]
    }
  }
}

{
  "servers": {
    "godot-forge": {
      "command": "npx",
      "args": ["-y", "godot-forge"]
    }
  }
}

{
  "mcpServers": {
    "godot-forge": {
      "command": "npx",
      "args": ["-y", "godot-forge"]
    }
  }
}

{
  "context_servers": {
    "godot-forge": {
      "command": {
        "path": "npx",
        "args": ["-y", "godot-forge"]
      }
    }
  }
}

{
  "mcpServers": {
    "godot-forge": {
      "command": "npx",
      "args": ["-y", "godot-forge"]
    }
  }
}

Tools

[!TIP] 6 of 8 tools work without Godot installed. Only test running, project launching, and screenshots need the binary.

Features

Test Runner

Auto-detects GUT and GdUnit4. Returns structured JSON with pass/fail counts, failure details with file paths and line numbers. Supports filtering by script, method, or inner class.

Ask your AI: "Run the water profile tests"
→ { total: 5, passed: 5, failed: 0, duration_ms: 462 }

Godot 3→4 Migration Mapping

The #1 reason AI writes broken GDScript. When your AI queries a deprecated API, it gets the correct Godot 4 equivalent instantly — 30+ mappings covering classes, methods, syntax, and constants.

Query: "KinematicBody"  →  "Renamed to CharacterBody3D in Godot 4"
Query: "yield"          →  "yield(obj, 'signal') → await obj.signal"
Query: "instance()"     →  "instance() → instantiate()"

Script Analysis — 10 Pitfalls

Every pitfall detected from real game development:

Scene Analysis

Parses .tscn and .tres files. Detects deep nesting (>8 levels), oversized scenes (>100 nodes), missing script references, preload() in .tres, integer resource IDs, and more.

LSP Diagnostics

Connects to Godot's built-in language server (runs automatically when the editor is open). Returns real compiler errors and warnings — no guesswork.

[!NOTE] Requires the Godot editor to be running with your project open. All other tools work without the editor.

Screenshot Capture

Captures the game viewport as a PNG image. Loads the project's main scene (or a specified scene), waits for rendering, and returns the screenshot as base64 for the AI to see.

Configuration

Godot Binary

Auto-detected in this order:

1. GODOT_PATH environment variable
2. godot / godot4 in PATH
3. Steam installation (macOS, Windows, Linux)
4. Platform defaults (/Applications/Godot.app, Homebrew, Scoop, Flatpak, Snap, etc.)

Override manually:

export GODOT_PATH="/path/to/godot"

See Godot Detection for the full list of searched paths.

Project Directory

Auto-detected by walking up from the current directory to find project.godot. Override:

npx godot-forge --project /path/to/godot/project

Requirements

• Node.js 18+ — for npx execution
• Godot 4.x — auto-detected (optional for 6 of 8 tools)
• Any MCP-compatible IDE — Claude Code, Cursor, VS Code, Windsurf, Zed, and more

Design Principles

• Outcomes, not operations — Each tool delivers a complete result, not raw API wrapping
• 8 curated tools — No 93-tool context bloat (why this matters)
• Progressive disclosure — Summaries first, details on demand
• spawn() not exec() — No command injection, no Windows quoting bugs
• Actionable errors — Every error includes a suggestion the AI can act on
• Cross-platform — macOS, Windows, Linux. Steam and non-Steam installs.

Contributing

Contributions are welcome! See CONTRIBUTING.md for guidelines.

• Bug reports — Open an issue
• Feature requests — Start a discussion
• Pull requests — Fork, branch, test, PR

Development

git clone https://github.com/gregario/godot-forge.git
cd godot-forge
npm install
npm run build
npm test        # 74 tests across 12 test files

Running locally

# Point your IDE at the local build
claude mcp add godot-forge-dev -- node /path/to/godot-forge/dist/index.js

Roadmap

See ROADMAP.md for planned features.

Phase 2 — Input simulation, runtime scene tree inspection, performance profiling, shader validation, export/CI pipeline.

Licence

MIT