mp_scaffold_lobby
Generate a lobby controller GDScript: host/join over ENet plus peer_connected/peer_disconnected tracking with player_joined / player_left / server_started / join_succeeded / join_failed signals. Attach it to your lobby scene root. DESTRUCTIVE (writes a .gd file) — gated by confirmation. No servic...
This record as markdown: /tools/breakpoint-mcp/mp-scaffold-lobby.md
What mp_scaffold_lobby does on Breakpoint
AI agents use mp_scaffold_lobby to create or update resources in Breakpoint, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Breakpoint environment.
| Parameter | Type | Required | Description |
|---|---|---|---|
port | integer | — | Default port baked into the script (default 24565) |
confirm | boolean | — | Auto-approve this destructive action (skip the confirmation prompt) |
to_path | string | Yes | Destination res:// .gd path, e.g. res://net/lobby.gd |
overwrite | boolean | — | Overwrite if the file already exists (default false) |
class_name | string | — | Optional class_name for the generated script |
max_players | integer | — | Server max players (default 8) |
Parameters from the server's own tool schema.
Why mp_scaffold_lobby is rated Medium
This is a Write operation because it creates a new file (a .gd GDScript) with generated code. While the description includes the word "DESTRUCTIVE" in all caps, the actual operation is file creation, not deletion or irreversible overwriting of existing data. The tool is gated by confirmation, which mitigates risk.
From the tool's definition Tool description explicitly states it "writes a .gd file". The tool generates and creates a GDScript file as output.
Risk signalsAdmin/system-level operation
Attacks that exploit this kind of access
The rule that runs mp_scaffold_lobby safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Breakpoint, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For mp_scaffold_lobby, this is the rule to start with:
mp_scaffold_lobby stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Breakpoint, apply this rule, and every mp_scaffold_lobby call is checked against it from then on.
Questions about mp_scaffold_lobby
Generate a lobby controller GDScript: host/join over ENet plus peer_connected/peer_disconnected tracking with player_joined / player_left / server_started / join_succeeded / join_failed signals. Attach it to your lobby scene root. DESTRUCTIVE (writes a .gd file) — gated by confirmation. No service is started. It is categorised as a Write tool in the Breakpoint MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
mp_scaffold_lobby accepts 6 parameters: port, confirm, to_path, overwrite, class_name, max_players. Required: to_path. The full parameter table on this page comes from the server's own tool schema.
Register the Breakpoint MCP server in PolicyLayer and add a rule for mp_scaffold_lobby: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Breakpoint. Nothing to install.
mp_scaffold_lobby is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the mp_scaffold_lobby rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for mp_scaffold_lobby. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
mp_scaffold_lobby is provided by the Breakpoint MCP server (breakpoint-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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