create_map · Loenn MCP: Risk & Policy

WHAT IT DOES

What create_map does on Loenn

AI agents use create_map 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 create_map needs a policy

create_map creates new data (a Celeste map file) in a reversible manner. This is a classic Write operation — the file can be deleted or modified afterward. While it generates new content, it does not execute arbitrary code, delete existing data irreversibly, or move funds.

From the tool's definition Tool description states 'Create a new empty Celeste .bin map file' — the verb 'create' indicates data creation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_map Rate-limited

create_map 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": {
    "create_map": {
      "limits": [
        {
          "counter": "create_map_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 create_map

What does the create_map tool do? +

Create a new empty Celeste .bin map file. 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 create_map? +

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

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

Can I rate-limit create_map? +

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

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

create_map 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.