rbx-mcp
Server Configuration
Describes the environment variables required to run the server.
| Name | Required | Description | Default |
|---|---|---|---|
| RBXMCP_DEV | No | Set to '1' to enable the dev HTTP route for direct Lua execution. Used for managed/corporate environments where MCP tools are blocked. | 0 |
Capabilities
Features and capabilities supported by this server
| Capability | Details |
|---|---|
| tools | {
"listChanged": true
} |
Tools
Functions exposed to the LLM to take actions
| Name | Description |
|---|---|
| execute_luaA | Run a Luau code string inside Roblox Studio (via loadstring) and return its captured output, return values, and any error with traceback. Use this to build, script, inspect, or modify anything in Studio; iterate by reading the error and re-running. |
| read_studio_stateA | Inspect Studio state in a clean form: 'selection' (current selection), 'explorer_tree' (workspace tree to a depth), 'instance' (one instance by dotted path, e.g. 'Workspace.Model.Part'), or 'services_summary'. Runs a server-owned snippet — no arbitrary code. |
| get_errorsA | Return the most recent failed executions (message + traceback). Useful for recovering context. |
Prompts
Interactive templates invoked by user choice
| Name | Description |
|---|---|
No prompts | |
Resources
Contextual data attached and managed by the client
| Name | Description |
|---|---|
No resources | |
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