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mcmodding-mcp

by OGMatrix
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MCModding-MCP

🤖 AI-Powered Minecraft Modding Documentation Server

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

npm version npm downloads License: MIT CI

GitHub stars GitHub issues GitHub last commit Node.js

📖 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 No more hallucinations or outdated API references!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

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

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:

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

  1. Push commits to dev using conventional commits

  2. Release-please maintains a Release PR (dev → prod)

  3. When merged, automatic release: npm publish + GitHub release + database upload

  4. 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

  1. Fork the repository

  2. Create a feature branch from dev

  3. Make changes with conventional commits

  4. 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

🎮 Built with ❤️ for the Minecraft modding community

Made with TypeScript Powered by SQLite Uses MCP

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

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security – no known vulnerabilities
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license - permissive license
A
quality - confirmed to work

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