mcmodding-mcp

v0.4.1

Published

a month ago

MCP server providing AI assistants with up-to-date Minecraft modding documentation for Fabric and NeoForge

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ogmatrix

minecraft modding fabric neoforge mcp model-context-protocol ai documentation

MCModding-MCP

🤖 AI-Powered Minecraft Modding Documentation Server

Give your AI assistant real-time access to Fabric & NeoForge documentation

📖 Documentation • 🚀 Quick Start • 💡 Features • 🤝 Contributing

✨ What is this?

MCModding-MCP is a Model Context Protocol (MCP) server that supercharges AI assistants like Claude with real, up-to-date Minecraft modding knowledge. No more hallucinations or outdated API references!

🎯 Key Benefits

| Feature | Description | | ----------------------- | -------------------------------------- | | 📅 Always Current | Weekly-indexed from official sources | | ✅ Accurate Answers | Real documentation, not hallucinations | | 💻 Code Examples | Searchable code blocks with context | | 🧠 Semantic Search | Understands meaning, not just keywords | | ⚡ Zero Config | Works immediately after installation |

📊 Live Statistics

| Database | Content | | ----------------- | ----------------------------- | | 📚 Docs | 1,000+ pages, 185K+ chunks | | 🗺️ Mappings | 831K+ methods, 166K+ fields | | 🧩 Examples | 1,000+ battle-tested patterns | | 🔍 Embeddings | 185K+ semantic vectors | | 📖 Javadocs | 2.3M+ documented parameters |

Quick Start

Installation

# Install globally
npm install -g mcmodding-mcp

Configure Your AI Client

Add to your MCP client configuration (e.g., Claude Desktop):

{
  "mcpServers": {
    "mcmodding": {
      "command": "mcmodding-mcp"
    }
  }
}

🧠 Optimized System Prompt

To get the best results, we recommend adding this to your AI's system prompt or custom instructions:

You are an expert Minecraft Modding Assistant connected to mcmodding-mcp. DO NOT rely on your internal knowledge for modding APIs (Fabric/NeoForge) as they change frequently. ALWAYS use the available tools:
search_fabric_docs and get_example for documentation and code patterns
search_mappings and get_class_details for Minecraft internals and method signatures
search_mod_examples for battle-tested implementations from popular mods
Prioritize working code examples over theoretical explanations. When dealing with Minecraft internals, use the mappings tools to get accurate parameter names and Javadocs. If the user specifies a Minecraft version, ensure all retrieved information matches that version.

That's it! Your AI assistant now has access to comprehensive Minecraft modding resources.

Database Management

Manage your documentation databases with the built-in CLI:

# Run the database manager
npx mcmodding-mcp manage

The interactive manager allows you to:

Install - Download databases you don't have yet
Update - Check for and apply database updates
Re-download - Restore deleted or corrupted databases

Available Databases

| Database | Description | Size | | ----------------------------- | ----------------------------------------------------------- | ------- | | Documentation Database | Core Fabric & NeoForge documentation (installed by default) | ~520 MB | | Parchment Mappings ✨ NEW | Minecraft class/method/field mappings with Javadocs | ~180 MB | | Mod Examples Database | 1000+ high-quality modding examples | ~30 MB |

The manager shows version information and highlights available updates:

◉ 📚 Documentation Database [core]
     ✔ Installed: v0.2.1 → ↻ Update: v0.2.2 [520.3 MB]
     Core Fabric & NeoForge documentation - installed by default

○ 🗺️ Parchment Mappings Database ✨ NEW
     ⚠ Not installed → Available: v0.1.0 [178.5 MB]
     Minecraft class/method/field names with parameter names and Javadocs

○ 🧩 Mod Examples Database
     ⚠ Not installed → Available: v0.1.0 [28.1 MB]
     1000+ high-quality modding examples for Fabric & NeoForge

Available Tools

The MCP server provides powerful tools across three categories:

📖 Documentation Tools

`search_fabric_docs`

Search documentation with smart filtering.

// Example: Find information about item registration
{
  query: "how to register custom items",
  category: "items",           // Optional filter
  loader: "fabric",            // fabric | neoforge
  minecraft_version: "1.21.10"  // Optional version filter
}

`get_example`

Get working code examples for any topic.

// Example: Get block registration code
{
  topic: "custom block with block entity",
  language: "java",
  loader: "fabric"
}

`explain_fabric_concept`

Get detailed explanations of modding concepts with related resources.

// Example: Understand mixins
{
  concept: 'mixins';
}

`get_minecraft_version`

Get current Minecraft version information.

// Get latest version
{
  type: 'latest';
}

// Get all indexed versions
{
  type: 'all';
}

🗺️ Parchment Mappings Tools ✨ NEW

Requires Parchment Mappings database - install via npx mcmodding-mcp manage

`search_mappings`

Search Minecraft class, method, and field mappings with parameter names and Javadocs.

// Example: Find block-related classes and methods
{
  query: "BlockEntity",
  type: "class",              // class | method | field | all
  minecraft_version: "1.21.10",
  include_javadoc: true
}

`get_class_details`

Get comprehensive information about a Minecraft class including all methods and fields.

// Example: Explore the Block class
{
  class_name: "net.minecraft.world.level.block.Block",
  include_methods: true,
  include_fields: true
}

`lookup_obfuscated`

Look up deobfuscated names from obfuscated identifiers (useful for crash logs).

// Example: Decode an obfuscated method name
{
  obfuscated_name: 'm_46859_';
}

`get_method_signature`

Get the full signature of a method including all parameter names and types.

// Example: Get method details
{
  class_name: "Block",
  method_name: "onPlace"
}

`browse_package`

Discover classes in a Minecraft package.

// Example: Browse block package
{
  package_name: 'net.minecraft.world.level.block';
}

🧩 Mod Examples Tools

Requires Mod Examples database - install via npx mcmodding-mcp manage

`search_mod_examples`

Search battle-tested code from popular mods like Create, Botania, and Applied Energistics 2.

// Example: Find block entity implementations
{
  query: "block entity tick",
  mod: "Create",              // Optional: filter by mod
  category: "tile-entities",
  complexity: "intermediate"
}

`get_mod_example`

Get detailed information about a specific example with full code and explanations.

// Example: Get full details for an example
{
  id: 42,
  include_related: true
}

`list_canonical_mods`

Discover all indexed mods and their available examples.

`list_mod_categories`

Browse available example categories (blocks, entities, rendering, etc.).

Features

Hybrid Search Engine

Combines multiple search strategies for best results:

| Strategy | Purpose | | ----------------------- | --------------------------------------- | | FTS5 Full-Text | Fast keyword matching with ranking | | Semantic Embeddings | Understanding meaning and context | | Section Search | Finding relevant documentation sections | | Code Search | Locating specific code patterns |

Auto-Updates

The database automatically checks for updates on startup:

Compares local version with GitHub releases
Downloads new versions with hash verification
Creates backups before updating
Non-blocking - server starts immediately

Documentation Sources

Currently indexes:

wiki.fabricmc.net - Fabric Wiki (226+ pages)
docs.fabricmc.net - Official Fabric Docs (266+ pages)
docs.neoforged.net - NeoForge Docs (512+ pages)

For Developers

Development Setup

# Clone repository
git clone https://github.com/OGMatrix/mcmodding-mcp.git
cd mcmodding-mcp

# Install dependencies
npm install

# Run in development mode
npm run dev

Build Commands

# Development
npm run dev              # Watch mode with hot reload
npm run typecheck        # TypeScript type checking
npm run lint             # ESLint
npm run test             # Run tests
npm run format           # Prettier formatting

# Production
npm run build            # Build TypeScript
npm run build:prod       # Build with fresh documentation index
npm run index-docs       # Index documentation with embeddings

# Database Management
npx mcmodding-mcp manage # Interactive database installer/updater

Project Structure

mcmodding-mcp/
├── src/
│   ├── index.ts              # MCP server entry point
│   ├── db-versioning.ts      # Auto-update system
│   ├── indexer/
│   │   ├── crawler.ts        # Documentation crawler
│   │   ├── chunker.ts        # Text chunking
│   │   ├── embeddings.ts     # Semantic embeddings
│   │   ├── store.ts          # SQLite database
│   │   └── sitemap.ts        # Sitemap parsing
│   ├── services/
│   │   ├── search-service.ts # Search logic
│   │   └── concept-service.ts # Concept explanations
│   └── tools/
│       ├── searchDocs.ts     # search_fabric_docs handler
│       ├── getExample.ts     # get_example handler
│       └── explainConcept.ts # explain_fabric_concept handler
├── scripts/
│   └── index-docs.ts         # Documentation indexing script
├── data/
│   ├── mcmodding-docs.db     # SQLite database
│   └── db-manifest.json      # Version manifest
└── dist/                     # Compiled JavaScript

Database Schema

-- Documents: Full documentation pages
CREATE TABLE documents (
  id INTEGER PRIMARY KEY,
  url TEXT UNIQUE NOT NULL,
  title TEXT NOT NULL,
  content TEXT NOT NULL,
  category TEXT NOT NULL,
  loader TEXT NOT NULL,          -- fabric | neoforge | shared
  minecraft_version TEXT,
  hash TEXT NOT NULL             -- For change detection
);

-- Chunks: Searchable content units
CREATE TABLE chunks (
  id TEXT PRIMARY KEY,
  document_id INTEGER NOT NULL,
  chunk_type TEXT NOT NULL,      -- title | section | code | full
  content TEXT NOT NULL,
  section_heading TEXT,
  code_language TEXT,
  word_count INTEGER,
  has_code BOOLEAN
);

-- Embeddings: Semantic search vectors
CREATE TABLE embeddings (
  chunk_id TEXT PRIMARY KEY,
  embedding BLOB NOT NULL,       -- 384-dim Float32Array
  dimension INTEGER NOT NULL,
  model TEXT NOT NULL            -- Xenova/all-MiniLM-L6-v2
);

-- FTS5 indexes for fast text search
CREATE VIRTUAL TABLE documents_fts USING fts5(...);
CREATE VIRTUAL TABLE chunks_fts USING fts5(...);

Release Workflow

This project uses release-please for automated releases.

Branch Strategy

| Branch | Purpose | | ------ | ------------------- | | dev | Active development | | prod | Production releases |

How It Works

Push commits to dev using conventional commits
Release-please maintains a Release PR (dev → prod)
When merged, automatic release: npm publish + GitHub release + database upload
Changes sync back to dev

See RELEASE_WORKFLOW.md for complete details.

Configuration

Environment Variables

| Variable | Description | Default | | ----------------- | ----------------------- | -------------------------- | | DB_PATH | Custom database path | ./data/mcmodding-docs.db | | GITHUB_REPO_URL | Custom repo for updates | Auto-detected | | MCP_DEBUG | Enable debug logging | false |

Disabling Auto-Updates

Set DB_PATH to a custom location to manage updates manually:

DB_PATH=/path/to/my/database.db mcmodding-mcp

💡 Share Your Ideas!

We're actively developing mcmodding-mcp and want to hear from you!

Have an Idea?

Feature requests - What tools would make your modding easier?
New documentation sources - Know a great modding resource we should index?
Workflow improvements - How could the tools work better for your use case?

👉 Open a Feature Request

Found a Bug?

Incorrect search results?
Missing or outdated documentation?
Tool not working as expected?

👉 Report a Bug

Share Your Experience

Using mcmodding-mcp for a cool project? We'd love to hear about it! Share your story in Discussions.

Contributing

We welcome contributions! See CONTRIBUTING.md for guidelines.

Quick Contribution Guide

Fork the repository
Create a feature branch from dev
Make changes with conventional commits
Submit a PR to dev

License

MIT License - see LICENSE for details.

Changelog

See CHANGELOG.md for a detailed history of changes and releases.

Acknowledgments

Fabric Documentation - Official Fabric documentation
Fabric Wiki - Community wiki
NeoForge Documentation - Official NeoForge documentation
ParchmentMC - Parameter names and Javadoc mappings
Model Context Protocol - MCP specification
Transformers.js - Local ML embeddings
better-sqlite3 - Fast SQLite bindings

🎮 Built with ❤️ for the Minecraft modding community

If you find this project useful, please consider giving it a ⭐!

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