Megaten Fusion MCP

A Model Context Protocol (MCP) server that provides fusion tool data for 40+ Megami Tensei games. Use it with Claude Desktop, Cursor, or any MCP-compatible AI.

Supported Games

• Shin Megami Tensei: SMT1, SMT2, SMT: If..., SMT3: Nocturne, SMT: Strange Journey, SMT4, SMT4A, SMT5
• Persona: P1, P2:IS, P2:EP, P3, P3R, P4, P5, P5S, P5T, PQ, PQ2
• Devil Summoner: Soul Hackers, Raidou 1 & 2, Soul Hackers 2
• Devil Survivor: DS1, DS2
• Others: Majin Tensei, Kyuyaku Megami Tensei And more! Uses a submodule of megaten-fusion-tool

Installation

With Claude Desktop

Add to your Claude Desktop config (~/Library/Application Support/Claude/claude_desktop_config.json on macOS):

{
  "mcpServers": {
    "megaten-fusion": {
      "command": "npx",
      "args": ["-y", "megaten-fusion-mcp"]
    }
  }
}

With Cursor

Add to your .cursor/mcp.json:

{
  "mcpServers": {
    "megaten-fusion": {
      "command": "npx",
      "args": ["-y", "megaten-fusion-mcp"]
    }
  }
}

From Source

git clone --recursive https://github.com/kreatoo/megaten-fusion-mcp.git
cd megaten-fusion-mcp
bun install
bun run start

Available Tools

Core Tools

Tool	Description
list_games	List all supported games
get_demon	Get demon/persona stats, skills, and info
search_demons	Search demons by race, level, name, skills, or elemental properties
get_skill	Get skill info and which demons learn it
search_skills	Search skills by name or element

Fusion Mechanics

Tool	Description
get_fusion_recipes	Find what two demons fuse into
get_fission_recipes	Find all combinations to create a demon
get_fusion_chart	Get race fusion chart for a game
get_special_recipe	Get special/multi-demon fusion recipes
find_fusion_recipe_with_skills	Find a recipe to create a demon with specific inherited skills

Elemental & Resistance Data

Tool	Description
get_demon_weaknesses	Get a demon's weak/strong/null/repel/drain elements

Game-Specific Features

Tool	Description
get_racial_skill	Get the unique skill for a race (some games only)
get_skill_inheritance	Get which skill types a demon can inherit (some games only)
get_demon_evolutions	Get evolution chains (some games only)

Enhanced search_demons Filters

The search_demons tool now supports additional filters:

• skill - Filter demons that learn a specific skill
• weakTo - Filter demons weak to an element (e.g., "fire", "ice")
• resistTo - Filter demons that resist/null/repel/drain an element

Example Queries

• "What personas can I make with Jack Frost in Persona 5?"
• "How do I fuse Yoshitsune in SMT5?"
• "What demons learn Megidolaon in Persona 3 Reload?"
• "List all Judgement personas above level 70 in P5"
• "What races fuse into Fool in Persona 4?"
• "Find a recipe to make High Pixie with Diarama in Persona 5"
• "What skills can Isis inherit in P5?"

Updating Game Data

This project uses the megaten-fusion-tool repo as a git submodule. To update to the latest game data:

git submodule update --remote

Data Source

All game data comes from aqiu384/megaten-fusion-tool - an excellent open-source fusion calculator. This MCP server simply wraps that data for AI accessibility.

License

Unlicense - see LICENSE for details.

The upstream megaten-fusion-tool is also Unlicense.