RPG Maker MV Ultimate MCP Server
A Model Context Protocol server that lets an AI agent edit a real RPG Maker MV project on disk — database, maps, events, system — through 13 consolidated tools, validated against the actual engine so the output is coherent and playable — and it can reason about the project (validate references, explain why an event never fires, critique a map) via analyze_project.
Its headline feature is knowledge-driven map generation: instead of painting tiles procedurally, generate_map clones hand-authored reference maps from 106 bundled RTP templates (real multi-tile buildings, walls, furniture) and adapts them to your project's tilesets — falling back to procedural generation only for themes without a template.
The 101 fine-grained v4 tool names still work as call aliases (set RPGMV_LEGACY_TOOLS=1 to also advertise them).
Install
The package ships an executable, so no clone is required. Add it to your MCP client:
{
"mcpServers": {
"rpgmaker-mv": {
"command": "npx",
"args": ["-y", "rpgmaker-mv-mcp"],
"env": {
"RPGMAKER_PROJECT_PATH": "/path/to/your/RPGMakerMV/project"
}
}
}
}
Works with Claude Desktop, Claude Code, opencode, and any MCP-compatible client. The server starts even without RPGMAKER_PROJECT_PATH — call set_project_path at runtime if you didn't set it.
From source
git clone https://github.com/DiegoLopez0208/RpgMakerMVUltimate-MCP
cd RpgMakerMVUltimate-MCP
npm install
npm run build
RPGMAKER_PROJECT_PATH=/path/to/your/project npm start
The 13 tools
| Tool | Purpose |
|---|---|
query_database | List / get by ID / search any database (actors, classes, skills, items, weapons, armors, enemies, states, troops, tilesets, common events, animations) |
create_database_entry | Create entries, with presets: damage_skill, healing_skill, buff_skill, state_skill, boss_enemy, encounter_troop |
update_database_entry | Partial updates; append commands to common events; add enemies to troops |
delete_database_entry | Delete entries (with reference-breakage warnings) |
query_map | Map tree, full map data, events, single event, lint (validate), offline ASCII render |
generate_map | Knowledge-driven generation: clones a real reference map per theme (or pure procedural / blank / themed / a specific template / batch / duplicate) |
edit_map | Fill tile layers, set display names, organize the map tree, connect two maps, set encounters |
manage_map_event | Create (presets: npc, chest, teleport, door, shop, inn, boss, puzzle_switch), update, convert an existing event into a merchant/inn/sign, delete, add commands, bulk-populate |
manage_system | Game title, switch/variable names, starting position |
analyze_project | Read-only project intelligence — overview, index, validate, graph, usage, explain, ast, plugins, critique, refactor, search (see below) |
get_project_context | Project digest, asset index, per-tileset tile IDs, bundled-template catalog |
set_project_path | Switch projects at runtime |
analyze_image | Optional Vision-AI image analysis, plus offline tileset grid measurement and quadrant colors |
Map generation (knowledge-driven)
generate_map defaults to mode: "procedural", which is smarter than the name suggests:
- For themes with a matching RTP reference template — town, village, dungeon, interior, castle, world, and more — it clones a hand-authored map from the 106 bundled templates, picking the closest size, so you get real 3D-looking buildings, walls and furniture instead of flat tile noise.
- For themes without a template (beach, swamp, desert, …) it generates procedurally (Perlin terrain, BSP dungeons, cellular caves).
- Same
seed+ params → the same map. PasstemplateIdto force a specific template, oruseTemplate: falseto force pure procedural.
Other modes: "blank" (empty canvas you paint with edit_map), "themed" (simple tile layout), "template" (instantiate one specific bundled map by templateId), "batch" (many maps at once), "duplicate" (copy an existing map).
{
"tool": "generate_map",
"arguments": { "mode": "procedural", "theme": "town", "name": "Riverbend", "width": 40, "height": 30 }
}
Combat themes (dungeon/cave/world/fortress/sewer/volcano) auto-wire random encounters from your existing troops, and town/village auto-create enterable house interiors with two-way warps. List available templates with get_project_context { detail: "templates" }.
Themes: forest town village castle dungeon cave beach desert swamp ruins interior snow harbor volcano sewer fortress magic_forest magic_interior space_interior space_exterior world
Offline map inspection
No API needed:
query_map { view: "ascii", mapId }— render a map as a character grid with event markers (the cheapest way to "see" a layout and pick coordinates).query_map { view: "validate", mapId }— lint for invalid tile IDs, broken transfers, and missing event terminators.
Project intelligence (analyze_project)
Read-only — it understands the whole project instead of re-reading files, so an agent can reason about a game it didn't build. All offline.
{ view: "overview" }— call this first on an unfamiliar project: counts, a health summary, and maps unreachable from the start.{ view: "validate" }— every consistency problem at once: broken transfers, missing map files, dangling common-event/item/troop references, duplicate IDs, unused switches/variables, unreachable maps.{ view: "explain", target: "switch", id }— why something never happens, e.g. "Switch 12 is read/gated in 3 places but is never set ON" (the usual cause of a door that never opens).target: "map"reports what a deletion would strand.{ view: "usage", kind: "variable", id }— every event/common-event/troop that touches it (with read/write roles).{ view: "graph" }— the map transfer network and reachability.{ view: "ast", mapId, eventId }— an event's logic as a readable tree.{ view: "plugins" }— what plugins the project uses, their parameters and commands.{ view: "critique", mapId }— a designer-style review of one map (dead space, empty/cluttered, event spread, monotony) with justified suggestions.{ view: "refactor" }— duplicated event logic worth extracting into a Common Event.{ view: "search", query: "the blacksmith" }— find things by meaning across names, dialogue and descriptions.
Vision AI (optional)
analyze_image { mode: "ai" } sends a project image (tileset, sprite, screenshot, battler) to any OpenAI-compatible vision endpoint. It is disabled by default — nothing is sent anywhere unless you configure it. The other modes ("grid", "colors") and all other tools work fully offline.
| Variable | Required | Description |
|---|---|---|
VISION_API_URL | to enable | Base URL of the vision API (e.g. https://api.openai.com, http://localhost:11434). Unset = vision disabled. |
VISION_API_KEY | optional | Bearer token; only sent when set. |
VISION_MODEL | optional | Model name (default meta/llama-3.2-90b-vision-instruct). |
VISION_API_PATH | optional | Endpoint path (default /v1/chat/completions). |
# OpenAI
VISION_API_URL=https://api.openai.com VISION_API_KEY=sk-... VISION_MODEL=gpt-4o npm start
# Ollama (local, no key)
VISION_API_URL=http://localhost:11434 VISION_MODEL=llava npm start
Supported backends: OpenAI, Ollama, LocalAI, NVIDIA NIM, vLLM, LiteLLM, or any OpenAI-compatible proxy.
Agent Skill (recommended for any AI agent)
A portable Agent Skill teaches any model (Claude, DeepSeek, …) the correct, crash-free workflow — building maps with generate_map and adding content with manage_map_event presets instead of hand-painting tiles or guessing IDs. It lives at skill/rpgmaker-mv-mcp/SKILL.md.
# Claude Code / Claude.ai
npx degit DiegoLopez0208/RpgMakerMVUltimate-MCP/skill/rpgmaker-mv-mcp ~/.claude/skills/rpgmaker-mv-mcp
# opencode
npx degit DiegoLopez0208/RpgMakerMVUltimate-MCP/skill/rpgmaker-mv-mcp ~/.opencode/skills/rpgmaker-mv-mcp
The skill is also listed in awesome-claude-skills.
Knowledge base
Static JSON reference data in knowledge/, extracted from the RPG Maker MV corescript and the bundled maps:
| File | Content |
|---|---|
tile-ids.json | Tile ID ranges, autotile formula, sheet descriptions |
passage-flags.json | Flag bits, common flags, passage check logic |
event-commands.json | ~140 event command codes with parameter schemas |
enums.json | Scope, occasion, hitType, damageType, restriction, etc. |
trait-effect-codes.json | Trait codes 11-64, effect codes 11-45 |
database-schemas.json | Full schemas for all MV data types |
image-paths.json | img/ directories, tileset slots, naming conventions |
map-templates.json | Index of the 106 bundled reference maps |
stamps.json | Mined multi-tile object stamps (trees, props) per tileset |
maps/ | 106 RTP reference map JSONs used for template cloning |
Feedback & contributing
This server is actively developed and feedback is very welcome — bug reports, weird maps, missing tools, or ideas. Please open a GitHub Issue with what you asked the agent to do and what you got (an exported map JSON or a screenshot helps a lot).
Known limitations & roadmap
- Decoration/object semantics are best-effort; rare multi-tile objects may be placed as single tiles.
- Town and dungeon layouts keep improving — planned: central plaza/well landmark, houses in rows facing roads, fences/yards, richer road networks, more dungeon-room variety.
- Vision AI is optional and requires your own endpoint.
Development
npm install
npm run build # tsc compile (+ copies knowledge/ into dist/)
npm test # vitest
npm run dev # tsx watch mode
Source: src/server.ts (tool handlers), src/toolDefinitions.ts + src/router.ts (the 13-tool surface), src/tools/* (per-domain CRUD), src/utils/mapGenerator.ts (template cloning + procedural generation), src/intel/* (the read-only project-intelligence layer behind analyze_project), knowledge/ (static reference data + bundled maps).
License
MIT