Roblox Executor MCP Server

Fork notice

This is a fork of upio/roblox-executor-mcp, modified to drive Sigma Spy instead of Cobalt as its remote spy. Everything else is upstream's work, unchanged.

What differs from upstream

• connector-src/bridge/handlers/remote-spy/logs.luau and connector.luau load Sigma Spy rather than Cobalt.luau

• remote-spy tool descriptions and connector status strings say "Sigma Spy"

The getgenv().Cobalt global is deliberately untouched: Sigma Spy publishes a compatibility bridge under that name, so upstream's handlers work unmodified.

Original work Copyright 2026 upio, MIT licensed — see LICENSE. All credit for the MCP server itself goes to upio.

An MCP server that allows Agents to interact with a running Roblox game client — execute code, inspect scripts, spy on remotes, and more.

Dashboard

Roblox Executor MCP includes a local web dashboard at:

http://localhost:16384/

Use it to see connected Roblox clients, inspect scripts, run tools, view server logs, configure semantic search, and index games for semantic script search.

Related MCP server: Roblox Executor MCP

Features

• Code Execution — Run Lua code and fetch data from the game client.

• Script Inspection — Decompile scripts and search across all sources.

• Instance Search — CSS-like selectors and hierarchy trees.

• Remote Spy — Intercept, log, block, and ignore Remotes/Bindables via Cobalt.

• GUI Interaction — Click buttons and type into text boxes.

• Screenshot — Capture Roblox window screenshots (Windows only).

• Multi-Client — Connect multiple Roblox clients at once.

Tutorial

Prerequisites

• Node.js ≥ 18

• Bun ≥ 1.3 for the interactive OpenTUI harness installer

• A Roblox executor that supports loadstring, request, and (preferably) WebSocket

Quick Start

1. Clone the server

git clone https://gitlab.com/upio/roblox-executor-mcp.git
cd roblox-executor-mcp

GitLab is the default source for installer and dashboard updates. Set ROBLOX_MCP_REPOSITORY_HOST=github to use the GitHub mirror for an update, or change USE_GITLAB in scripts/repository-source.mjs to change the default.

2. Run the installer

The installer opens a guided browser setup. It builds the server, configures selected AI harnesses, optionally installs the packaged Roblox MCP skill and Roblox connector, and can register the shared server to run in the background with your computer.

npm run install:harnesses

The browser opens with a one-time secure installer link. Keep the terminal open until setup finishes. The normal server build consumes the committed connector.luau artifact, so installs do not require Darklua. Connector developers can install the pinned tool with rokit install, edit connector-src/, and regenerate the artifact with npm run build:connector.

For a terminal-only setup, use the explicit CLI installer. The CLI picker is built with OpenTUI and runs through Bun:

npm run install:harnesses:cli

If the interactive terminal picker is unavailable, add -- --plain. Press s in the picker or pass -- --show-all-harnesses to reveal every supported config target. After writing configs, both installers can automatically restart supported GUI harnesses that are currently running. CLI-only harness sessions still receive a restart instruction when they cannot be relaunched safely.

To explore the browser flow without changing configs, installing packages, registering a service, or restarting harnesses, run:

npm run install:harnesses:preview

Pass -- --no-open to either browser command to start it without opening a browser. Pass -- --host 0.0.0.0 to access it from another device over your LAN or Tailscale; use the complete tokenized URL printed by the installer.

The installer can also place the Roblox loader into a detected executor autoexec folder, such as MacSploit on macOS or supported Windows executor autoexec folders. Use the prompt, or run:

npm run getscript -- --autoexec

It can also help with:

• cross-machine setup on the same LAN

• copying the Roblox loader to your clipboard

• optional Ollama embeddinggemma setup for semantic indexing

• pulling latest repo changes before install/build

To update an existing install later, run:

npm run update

You can also open Dashboard → Settings → Server updates and select Update now.

Manual setup

If you prefer to configure a client yourself, use the setup guide for your client:

3. Connect from Roblox

The installer prints this for you. Put it in your executor or Auto Execute:

while not getgenv().MCP_Loaded do
    local bridgeUrl = getgenv().BridgeURL or "localhost:16384"
    pcall(function() loadstring(game:HttpGet("http://" .. bridgeUrl .. "/script.luau"))() end)

    task.wait(0.15)
end

Optional settings (set before the loadstring):

getgenv().BridgeURL = "10.0.0.4:16384"                  -- default: localhost:16384
getgenv().DisableWebSocket = true                        -- force HTTP polling
getgenv().DisableInitialScriptDecompMapping = true       -- skip initial decompilation
getgenv().MCP_FailedScriptResyncInterval = 30            -- retry failed script syncs periodically
getgenv().MCP_FailedScriptResyncBatchSize = 8            -- bound each periodic retry batch

After the MCP server starts and Roblox connects, open the dashboard:

http://localhost:16384/

Community

Have a suggestion or need help? Join the Discord server.

Security

This server allows arbitrary code execution. Only use with AI clients you trust. Port 16384 has no authentication — never expose it to the internet. For cross-machine setups, use a local network, VPN, or SSH tunnel. See Advanced for details.

License

MIT