move_entity · Loenn MCP: Risk & Policy

WHAT IT DOES

What move_entity does on Loenn

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

WHY IT NEEDS A POLICY

Why move_entity needs a policy

This tool creates or modifies data (entity position) reversibly within the .bin map structure. Changes can be undone (e.g., by moving the entity back or using undo functionality), making it Write rather than Destructive. The blast radius is medium because incorrect entity positioning could break map logic or gameplay, but the action is not permanent and the map file itself is not deleted.

From the tool's definition Tool name 'move_entity' and description 'Move an entity to a new position' indicate modification of entity coordinates/properties within a Celeste map file.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

move_entity Rate-limited

move_entity 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": {
    "move_entity": {
      "limits": [
        {
          "counter": "move_entity_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Loenn, so you can run agents against it safely.

FAQ

Questions about move_entity

What does the move_entity tool do? +

Move an entity to a new position. It is categorised as a Write tool in the Loenn MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on move_entity? +

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

What risk level is move_entity? +

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

Can I rate-limit move_entity? +

Yes. Add a rate_limit block to the move_entity 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 move_entity completely? +

Set action: deny in the PolicyLayer policy for move_entity. 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 move_entity? +

move_entity is provided by the Loenn MCP server (magedeline/loenn-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.