maid_generate_stubs · Maid Runner MCP: Risk & Policy

WHAT IT DOES

What maid_generate_stubs does on Maid Runner

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

WHY IT NEEDS A POLICY

Why maid_generate_stubs needs a policy

Stub generation creates or modifies code/test files but does not execute arbitrary operations or delete data. This is a write-class tool because it produces new artifacts. Severity is medium due to potential for unintended file creation or overwrites in the project structure.

From the tool's definition Tool name 'maid_generate_stubs' suggests code generation. Server context shows validation/testing tools. 'generate_stubs' typically creates test stub files or placeholder code structures, which are reversible modifications.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

maid_generate_stubs Rate-limited

maid_generate_stubs 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": {
    "maid_generate_stubs": {
      "limits": [
        {
          "counter": "maid_generate_stubs_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 Maid Runner, so you can run agents against it safely.

FAQ

Questions about maid_generate_stubs

What does the maid_generate_stubs tool do? +

maid_generate_stubs. It is categorised as a Write tool in the Maid Runner MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on maid_generate_stubs? +

Register the Maid Runner MCP server in PolicyLayer and add a rule for maid_generate_stubs: 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 Maid Runner. Nothing to install.

What risk level is maid_generate_stubs? +

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

Can I rate-limit maid_generate_stubs? +

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

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

maid_generate_stubs is provided by the Maid Runner MCP server (mamertofabian/maid-runner-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.