mcp server

hoi4-agent-tools

HOI4 modding tools for agents: local references, visual previews, focus trees, interfaces and maps.

klimPaskov/hoi4-agent-toolscommunitylistedunreviewednot running here yet

Use tool

Set up

Runs on your computer. Pick your agent and operating system.

Before you start

Node.js 20 or newer

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "hoi4-agent-tools": {
      "command": "npx",
      "args": [
        "-y",
        "hoi4-agent-tools"
      ]
    }
  }
}

same format Cursor, GitHub Copilot CLI, Junie, JetBrains AI Assistant, Augment (Auggie CLI), Factory Droid, Kiro, Devin CLI +12

Values in angle brackets are placeholders. Restart Claude Desktop after editing its config.Claude Desktop docs

README

synced Oct 14, 2026

HOI4 Agent Tools

An MCP server that helps coding agents build and edit Hearts of Iron IV mods. Make focus trees, events and decisions. Edit maps and generate a new world. Preview windows, trees and maps, find the right rule in the docs, fix broken script and balance AI choices.

What it does

Your agent can build and edit focus trees, events, decisions and maps, and generate a new world. It previews focus trees, technology folders, windows and maps, finds the right rule in the game's documentation, fixes broken script and tunes AI choices. You describe what you want; the agent picks the right tools.

Quick start

Install Node.js 22 (22.19 or later) or 24, and keep Hearts of Iron IV installed for vanilla files, artwork and fonts.
Install the server:
```
npm install --global hoi4-agent-tools
```
Print the client configuration:
```
hoi4-agent-tools-setup --print-client-config
```
Paste the globalInstall block into a JSON client such as Claude Code, Claude Desktop or Cursor, or the codexTomlGlobal block into Codex's config.toml.
Open your mod folder as the agent's workspace and tell it what you want to build or fix.

The setup guide covers several mods, explicit game paths, local wiki snapshots and troubleshooting with --discover and --diagnose.

Watch the Agent Tools demo or use HOI4 Mod Setup to install and connect the server for your mod. Part of the HOI4 modding toolkit with Agentic HOI4 Modding (skills and instructions for your agent) and HOI4 Live Tools (testing in the running game).

Examples

Each pair shows a capture from the game next to the server's preview of the same source.

In game	Server preview

See more in the examples gallery.

Tools

The server gives your agent previews, documentation, script analysis and editing tools. The agent combines them with its file editor to build events and decisions, repair scripts and adjust AI weights. The tool reference lists exact names, arguments and results for integrations.

FAQ

Where do edits go? Changes are written to your mod folder; use Git to review or undo them.

Does it run the game? No. Previews come from mod source; test gameplay in HOI4 to see live clicks, AI choices and timing.

Configuration

Started inside a mod folder, the server needs no configuration file. hoi4-agent-tools-setup --init writes one when you work on several mods or the game is not found automatically. For remote or shared use, hoi4-agent-tools-http serves the same tools over HTTP with tokens or OAuth. See the configuration reference and the HTTP guide.

Documentation

Setup and configuration
Examples and tool reference
Guides: local references, focus trees, scripted GUIs, maps, events, technology, AI weights and timing, decisions and impact, mechanic and package tests
Background jobs and HTTP
Development, changelog and security policy
Documentation index

Development

npm ci
npm run check

See the contributing guide and the development guide.

License

Apache-2.0; see LICENSE and the third-party notices. Hearts of Iron IV artwork belongs to Paradox Interactive; this project is unaffiliated with Paradox Interactive. The in-game captures were supplied for these comparisons.