Naninovel MCP Server

Unity C# plugin that exposes Naninovel script authoring and playback controls via the Model Context Protocol (MCP), enabling AI assistants to write, edit, and test visual novel scripts.

Features

• Independent of Play Mode - Server runs in Editor at all times
• NaniScript CRUD - Create, read, update, delete script files
• Direct Playback - Skip title screen and jump to any script/label
• Input Simulation - Advance dialogue, simulate key presses
• Visual Verification - Screenshot capture for scene validation

Quick Start

1. Open Unity Editor
2. Server auto-starts (or open Window > Nani MCP > Server Status)
3. Connect your MCP client to http://localhost:6274

For Antigravity, add to your mcp_config.json:

{
  "mcpServers": {
    "nani-mcp": {
      "serverUrl": "http://localhost:6274"
    }
  }
}

Available Tools

Script File Operations (Editor Mode)

Tool	Description
list_scripts	Lists all .nani files in Scenarios folder
read_script	Reads content of a script file
write_script	Creates or overwrites a script file
edit_script	Insert, replace, or delete lines in a script
delete_script	Deletes a script file (with backup)

Playback Controls (Play Mode)

Tool	Description
quick_play	Play a script directly, bypassing title screen
execute_command	Execute a single Nani command
play_script	Load and play a script
stop_player	Stop current playback
goto_label	Jump to a specific label
get_playback_status	Get current playback state

Scene & State (Play Mode)

Tool	Description
capture_screenshot	Capture current Game View as PNG
get_scene_state	Get visible actors and positions
get_variables	List all custom variables
set_variable	Set a variable value

Input Simulation (Play Mode)

Tool	Description
continue_dialogue	Advance to next dialogue line
simulate_key	Simulate keyboard key press
simulate_click	Simulate mouse click

Unity Editor Controls

Tool	Description
enter_play_mode	Start Unity Play Mode (from title screen)
exit_play_mode	Stop Unity Play Mode
get_unity_status	Get Unity Editor status and Play Mode state
list_scenes	List all Unity scenes in Build Settings

Example: Writing a Script

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "write_script",
    "arguments": {
      "path": "events/new_scene.nani",
      "content": "; New Scene\n@back Classroom\n@char NaniChan\nNaniChan: Bonjour!"
    }
  }
}

Example: Quick Play

{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "tools/call",
  "params": {
    "name": "quick_play",
    "arguments": {
      "script": "events/new_scene",
      "resetState": true
    }
  }
}

Configuration

Open Window > Nani MCP > Server Status to configure:

• Port: WebSocket server port (default: 6274)
• Auto-start: Start server automatically when Editor opens

License

MIT License