import_room_json · Loenn MCP: Risk & Policy

WHAT IT DOES

What import_room_json does on Loenn

AI agents use import_room_json 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 import_room_json needs a policy

Import operations create or modify data structures (rooms in this case) within map files. This is reversible (can be undone or re-imported), distinguishing it from Destructive. However, the empty description limits confidence—it could potentially have Execute-like properties if import validation/parsing is unsafe.

From the tool's definition Tool name 'import_room_json' with context of Celeste .bin map file editing; sibling tools include 'add_room', 'add_entity', 'add_trigger' which are clearly Write operations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

import_room_json Rate-limited

import_room_json 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": {
    "import_room_json": {
      "limits": [
        {
          "counter": "import_room_json_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 import_room_json

What does the import_room_json tool do? +

import_room_json. 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 import_room_json? +

Register the Loenn MCP server in PolicyLayer and add a rule for import_room_json: 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 import_room_json? +

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

Can I rate-limit import_room_json? +

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

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

import_room_json 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.