add_user · Windows Operations MCP: Risk & Policy

WHAT IT DOES

What add_user does on Windows Operations MCP

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

WHY IT NEEDS A POLICY

Why add_user needs a policy

Based on the tool name 'add_user' on a Windows system administration MCP server, this tool most likely creates a new user account on the Windows system. Creating a user account is a Write operation (reversible via deletion), but carries high severity due to potential privilege escalation or unauthorized access risks. Confidence is reduced due to the empty description.

From the tool's definition Tool name 'add_user' on a Windows system management server; description is empty and uninformative.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_user Rate-limited

add_user 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": {
    "add_user": {
      "limits": [
        {
          "counter": "add_user_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 Windows Operations MCP, so you can run agents against it safely.

FAQ

Questions about add_user

What does the add_user tool do? +

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

How do I enforce a policy on add_user? +

Register the Windows Operations MCP server in PolicyLayer and add a rule for add_user: 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 Windows Operations MCP. Nothing to install.

What risk level is add_user? +

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

Can I rate-limit add_user? +

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

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

add_user is provided by the Windows Operations MCP server (sandraschi/windows-operations-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.