horizOn MCP Server

MCP server for horizOn Backend-as-a-Service -- gives AI coding assistants documentation, live API tools, and workflow prompts for game and app development.

Quick Install

Add to your MCP client configuration (Claude Desktop, Cursor, etc.):

{
  "mcpServers": {
    "horizOn": {
      "command": "npx",
      "args": ["-y", "horizon-mcp"],
      "env": {
        "HORIZON_API_KEY": "your-api-key-here"
      }
    }
  }
}

Features

Resources (13 docs)

Documentation resources are served directly from the MCP server. No API key required.

| URI | Description | |-----|-------------| | horizon://overview | What is horizOn, core concepts (Account vs User), features, tier system, API structure, and SDKs | | horizon://docs/auth | Authentication methods (Anonymous, Email, Google), endpoints, SDK code examples, and common errors | | horizon://docs/leaderboard | Leaderboard score submission, top entries, user rank, entries around user, with SDK examples | | horizon://docs/cloud-save | Cloud save/load for JSON and binary data, tier size limits, SDK examples | | horizon://docs/remote-config | Server-side key-value configuration: feature flags, game balance, A/B testing. SDK examples | | horizon://docs/news | In-game news and announcements with language filtering. SDK examples | | horizon://docs/gift-codes | Gift code validation and redemption for promotional rewards. SDK examples | | horizon://docs/feedback | Bug reports, feature requests, and general feedback submission. SDK examples | | horizon://docs/user-logs | Server-side event and error tracking. Requires BASIC tier or higher. SDK examples | | horizon://api/reference | Complete API reference for all horizOn App API endpoints with request/response schemas | | horizon://quickstart/godot | Step-by-step guide to integrate horizOn in Godot with GDScript examples | | horizon://quickstart/unity | Step-by-step guide to integrate horizOn in Unity with C# examples | | horizon://quickstart/unreal | Guide to integrate horizOn in Unreal Engine using REST API. C++ and cURL examples |

Tools (19 tools)

Live API tools that call the horizOn backend. Requires a valid API key.

| Tool | Description | |------|-------------| | horizon_test_connection | Test connection to the horizOn API (health check) | | horizon_signup_anonymous | Create a new anonymous user account | | horizon_signup_email | Create a new user account with email and password | | horizon_signin_email | Sign in with email and password | | horizon_signin_anonymous | Sign in with an anonymous token | | horizon_check_auth | Check whether a user session is still valid | | horizon_submit_score | Submit a score to the leaderboard | | horizon_get_leaderboard_top | Get the top leaderboard entries | | horizon_get_user_rank | Get a user's leaderboard rank | | horizon_get_leaderboard_around | Get leaderboard entries around a user's position | | horizon_save_cloud_data | Save cloud data for a user | | horizon_load_cloud_data | Load cloud save data for a user | | horizon_get_remote_config | Get a single remote config value by key | | horizon_get_all_remote_configs | Get all remote config values | | horizon_get_news | Get news articles with optional language filtering | | horizon_validate_gift_code | Validate a gift code without redeeming it | | horizon_redeem_gift_code | Redeem a gift code for a user | | horizon_submit_feedback | Submit user feedback (bug reports, feature requests) | | horizon_create_log | Create a server-side log entry (INFO, WARN, ERROR) |

Prompts (4 prompts)

Workflow prompts that guide AI assistants through common horizOn tasks.

| Prompt | Description | |--------|-------------| | integrate-feature | Generate integration code for a specific horizOn feature in your game engine | | setup-auth | Step-by-step guide to set up horizOn authentication in your project | | debug-connection | Diagnose and fix horizOn connection issues | | explain-feature | Get a detailed explanation of any horizOn feature |

Configuration

| Variable | Required | Description | |----------|----------|-------------| | HORIZON_API_KEY | Yes (for tools) | Your horizOn API key. Get one at horizon.pm | | HORIZON_BASE_URL | No | API base URL. Defaults to https://horizon.pm |

Resources (documentation) work without an API key. Only the live API tools require authentication.

What is horizOn?

horizOn is a multi-tenant Backend-as-a-Service platform built for game and app developers. It provides a managed backend so developers can focus on building their game or app instead of server infrastructure.

Core features:

• Authentication (Anonymous, Email, Google)
• Leaderboards
• Cloud Save
• Remote Config
• News and Announcements
• Gift Codes
• User Feedback
• User Logs

Learn more at horizon.pm. Install this MCP server via npm.

Supported Engines

• Godot 4.5+ -- GDScript SDK
• Unity 6 -- C# SDK
• Unreal Engine -- REST API (no official SDK)

Development

# Clone the repository
git clone https://github.com/nicokimmel/horizOn-mcp.git
cd horizOn-mcp

# Install dependencies
npm install

# Start the server (development mode)
npm run dev

# Build for production
npm run build

# Run tests
npm test

License

MIT