Roblox AI Vibe Coder 🚀

Roblox AI Vibe Coder is an elite integration between Roblox Studio and Google Gemini, powered by the Model Context Protocol (MCP). It turns the AI from a simple code generator into a proactive, "ground-aware" game engineer that can live-build, debug, and manipulate your Roblox worlds in real-time.

🌟 Key Features

• Proactive Engineering: The agent doesn't just suggest code; it applies fixes, inspects logs, and verifies its own changes immediately.
• Voice-Powered Interaction (PTT): Hold the Right Command key to speak directly to the agent.
• Instant Interruption: Don't wait for the agent to finish; you can interrupt a thinking loop or a tool execution at any time by speaking.
• Ground-Aware Building: Integrated spatial logic ensures that spawned objects, NPCs, and assets automatically snap to the terrain surface.
• Rich Toolset:
  • Hierarchy Inspection: Deep-dive into any Service tree.
  • Scripting Excellence: Source reading, overwriting, and Cursor-style patching.
  • Real-time Debugging: Instant access to Studio logs and error detection with automatic log fetching on failure.
  • World Manipulation: Bulk property editing, terrain generation, and procedural scattering.
  • Smart Asset Integration: Search and setup marketplace items (weapons, NPCs, props) with one command.
  • System Architecture: High-fidelity tools for UI generation, Lighting presets, and robust Game Logic patterns.
  • Mechanical Engineering: Construct vehicles and machines using constraints (Welds, Hinges, Motors) with connect_parts.
  • Quality Assurance: Built-in unit testing runner (run_unit_tests) and performance monitoring (get_performance_stats).
  • Codebase Navigation: Instantly find logic across all scripts with search_scripts.
  • Gemini Thinking Support: Leverages Gemini's reasoning capabilities to plan complex multi-step operations before execution.

🏗️ Architecture

The project consists of three main layers:

1. Orchestrator (roblox_ai.py): An event-driven brain built with Python 3.11's asyncio.TaskGroup. It manages a central event queue for text and voice, handling real-time interruptions and Gemini 3 Flash multimodal sessions.
2. Virtual Tool Layer (tools/): Definitions and Lua templates that map high-level AI actions (like generate_procedural_terrain) to optimized Luau execution.
3. Roblox Studio MCP Server: A binary (e.g., rbx-studio-mcp) that acts as a bridge, receiving Luau code from the orchestrator and executing it directly inside the active Studio session.

🚀 Getting Started

Prerequisites

1. Roblox Studio MCP: You must have the Roblox Studio MCP bridge installed and running.
   • Default path expected: /Applications/RobloxStudioMCP.app/Contents/MacOS/rbx-studio-mcp
2. Google Gemini API Key: Obtain a key from Google AI Studio.
3. Python 3.11+: Required for asyncio.TaskGroup and structured concurrency.

Installation

# Clone the repository
git clone https://github.com/your-repo/roblox-ai-vibe-coder.git
cd roblox-ai-vibe-coder

# Install dependencies
uv sync

Configuration

Create a .env file in the root directory:

GEMINI_API_KEY=your_api_key_here

Running the Agent

Start the interactive session:

uv run roblox_ai.py

How to interact:

• Type: Enter commands normally at the > prompt.
• Speak: HOLD the Right Command key, speak your instruction, and release to send.
• Interrupt: Press Right Command at any time to cancel the agent's current task and start a new voice command.

Once connected, you can talk to the agent:

• "Generate a rolling hills landscape with a small village near the spawn."
• "Debug why my zombie NPC isn't moving."
• "Find all scripts that reference 'GoldValue' and update them to use the new 'Currency' module."
• "Style all parts in Workspace named 'Wall' to be semi-transparent and red."

🛠️ Tooling Summary

🌍 World & Environment

Tool	Description
generate_procedural_terrain	Noise-based terrain generation (Hills, Plains, etc.).
manipulate_terrain	Precision terrain editing (Fill Block/Ball, Subtract).
scatter_objects	Procedurally scatter assets with surface alignment.
configure_lighting	One-click professional lighting presets (Day, Night, Horror).
raycast_check	Debug physics and line-of-sight.
get_spatial_summary	AI vision of the immediate surroundings.

🧱 Building & Assets

Tool	Description
smart_setup_asset	Search, insert, and auto-place Marketplace assets.
search_marketplace	Query the Roblox library for asset IDs.
create_timed_spawner	Automated object spawning system.
connect_parts	Create mechanical constraints (Welds, Motors, Hinges).
modify_instance	Bulk property updates for styling.
reparent_instance	Move objects (e.g., equip tools/scripts).
create_instance	Recursive instance creation (great for custom trees).

💻 Scripting & Logic

Tool	Description
read/edit/patch_script	Full suite of script management tools.
inject_script_template	Inject standard game patterns (Leaderstats, Doors).
search_scripts	Find code across the entire project.
run_unit_tests	Execute .spec verification scripts.
create_ui_layout	Generate responsive UI hierarchies.

🔍 Debugging & Inspection

Tool	Description
inspect_service	Tree view of hierarchy and attributes.
get_studio_logs	Fetch real-time Output window logs.
get_object_info	Detailed property and tag inspection.
find_instances	Search for objects by Name or ClassName.
get_performance_stats	Monitor Memory, FPS, and Primitives.
manage_tags	CollectionService tag management.

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⚠️ Important Notes

• Edit vs. Play Mode: Some actions (like spawning objects via script) behave differently in Play Mode. Use get_studio_state to check the environment.
• Publishing: The publish_game tool is included but will always require manual confirmation for safety.
• Engine Security: Certain properties (like Technology) cannot be set via script due to Roblox engine restrictions.

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Built for engineers who value simplicity, robustness, and the "vibe" of building.