write_plugin_code · RPG Maker MZ MCP Server MCP

WHAT IT DOES

What write_plugin_code does on RPG Maker MZ MCP Server

AI agents use write_plugin_code to create or update resources in RPG Maker MZ MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your RPG Maker MZ MCP Server environment.

WHY IT NEEDS A POLICY

Why write_plugin_code needs a policy

This tool creates new plugin files (JavaScript code) in the plugins directory, which is a Write operation as it creates new data/files. However, the severity is elevated to 'high' rather than standard 'medium' because: (1) plugins are executable code that will run within RPG Maker MZ, giving them significant capability to affect game behavior; (2) if an AI agent generates malicious or broken plugin code, it could…

From the tool's definition Tool writes a plugin file to js/plugins directory, creating new executable JavaScript code in the project's plugin folder.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

write_plugin_code Rate-limited

write_plugin_code 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": {
    "write_plugin_code": {
      "limits": [
        {
          "counter": "write_plugin_code_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 RPG Maker MZ MCP Server, so you can run agents against it safely.

FAQ

Questions about write_plugin_code

What does the write_plugin_code tool do? +

Write a plugin file to js/plugins directory. It is categorised as a Write tool in the RPG Maker MZ MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on write_plugin_code? +

Register the RPG Maker MZ MCP Server MCP server in PolicyLayer and add a rule for write_plugin_code: 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 RPG Maker MZ MCP Server. Nothing to install.

What risk level is write_plugin_code? +

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

Can I rate-limit write_plugin_code? +

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

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

write_plugin_code is provided by the RPG Maker MZ MCP Server MCP server (rein1225/rpgmakermz_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.