generate_map_from_image · Loenn MCP: Risk & Policy

WHAT IT DOES

What generate_map_from_image does on Loenn

AI agents use generate_map_from_image 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 generate_map_from_image needs a policy

This tool creates or generates new map content (likely from an image input), which modifies the .bin map file. This is reversible data creation/modification, fitting the Write category. Severity is medium because incorrect generation could corrupt maps or require rework, but the effects are contained to map files and reversible.

From the tool's definition Tool name 'generate_map_from_image' combined with server description stating it can 'edit...procedurally generate...Celeste .bin map files'. The 'generate' verb and context of procedural generation indicates creation of map data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

generate_map_from_image Rate-limited

generate_map_from_image 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": {
    "generate_map_from_image": {
      "limits": [
        {
          "counter": "generate_map_from_image_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 generate_map_from_image

What does the generate_map_from_image tool do? +

generate_map_from_image. 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 generate_map_from_image? +

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

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

Can I rate-limit generate_map_from_image? +

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

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

generate_map_from_image 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.