editor_set_main_scene

Set the project main scene.

SERVERGodot SOURCE@yanhuifair/godot-mcp

Medium RISK CLASS

Category Write

Parameters 11 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/yanhuifair-godot-mcp/editor-set-main-scene.md

WHAT IT DOES

What editor_set_main_scene does on Godot

AI agents use editor_set_main_scene to create or update resources in Godot, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Godot environment.

Parameter	Type	Required	Description
`scene`	string	Yes	Scene path to set as main

Parameters from the server's own tool schema.

RISK

Why editor_set_main_scene is rated Medium

This tool modifies project metadata by changing which scene is the main entry point. While reversible (can be changed again), it affects runtime behavior and project integrity. It's a Write action because it updates project state without destruction, but severity is high because misconfiguration could break game initialization or cause unexpected behavior if an agent sets it to invalid/unsafe values.

From the tool's definition Set the project main scene. This modifies project configuration state (the entry point scene for game execution).

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs editor_set_main_scene safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Godot, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For editor_set_main_scene, this is the rule to start with:

editor_set_main_scene Rate-limited

editor_set_main_scene 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "editor_set_main_scene": {
      "limits": [
        {
          "counter": "editor_set_main_scene_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Godot, apply this rule, and every editor_set_main_scene call is checked against it from then on.

FAQ

Questions about editor_set_main_scene

What does the editor_set_main_scene tool do? +

Set the project main scene. It is categorised as a Write tool in the Godot MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does editor_set_main_scene accept? +

editor_set_main_scene accepts 1 parameter: scene. Required: scene. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on editor_set_main_scene? +

Register the Godot MCP server in PolicyLayer and add a rule for editor_set_main_scene: 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 Godot. Nothing to install.

What risk level is editor_set_main_scene? +

editor_set_main_scene is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit editor_set_main_scene? +

Yes. Add a rate_limit block to the editor_set_main_scene 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.

How do I block editor_set_main_scene completely? +

Set action: deny in the PolicyLayer policy for editor_set_main_scene. 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.

What MCP server provides editor_set_main_scene? +

editor_set_main_scene is provided by the Godot MCP server (@yanhuifair/godot-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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