Mcplink

McpLink

**An MCP server that runs inside Resonite.** McpLink is a [ResoniteModLoader](https://github.com/resonite-modding-group/ResoniteModLoader) mod that embeds a [Model Context Protocol](https://modelcontextprotocol.io/) server in the game process, so an AI agent — Claude Code, or any MCP-capable client — can inspect and modify your live Resonite worlds: slots, components, ProtoFlux, assets, physics, screenshots, event streams, and (optionally) C# against the running engine. **97 tools**, no per-session setup, works in any world including Userspace.

Because the server lives *inside* the engine, it sees what in-game inspectors see: real RefIDs as addresses, private/non-synced state via reflection, unrestricted method calls. Every mutating tool registers with the engine's undo system, so an agent's mistake is one Ctrl+Z in-game.

⚠ **Security, before anything else.** The endpoint binds to **localhost only**, but anything that can reach it has, in effect, the power of the game process itself (arbitrary method invocation ≈ arbitrary code in-game). Don't expose the port beyond localhost. Set `allowWrites: false` in the mod config if you want a strictly read-only agent.

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1. Get the mod set up

**You need:** Resonite (Windows; Steam path assumed by defaults, any install works) with **[ResoniteModLoader](https://github.com/resonite-modding-group/ResoniteModLoader)** installed and working — that's the one hard prerequisite, and its README covers installing it from scratch.

1. Download the latest release from the Releases page — either the full McpLink-x.y.z.zip bundle (recommended) or the bare McpLink.dll.
2. Install — the zip mirrors your Resonite install; with the game closed:
   • copy rml_mods\McpLink.dll into your Resonite rml_mods folder (e.g. C:\Program Files (x86)\Steam\steamapps\common\Resonite\rml_mods);
   • (optional — enables the eval C# scripting tool) copy