create_user · MCP Node Js TypeScript API MCP: Risk & Policy

WHAT IT DOES

What create_user does on MCP Node Js TypeScript API

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

WHY IT NEEDS A POLICY

Why create_user needs a policy

This tool creates new data (a user record) in the database. Creation is reversible (the user can be deleted), so it is Write rather than Destructive. The severity is medium because an AI agent could create many unauthorized user accounts, leading to account bloat and potential unauthorized access, but the impact is mitigated by the fact that creation is reversible and does not directly compromise existing data or…

From the tool's definition Tool name is 'create_user' and description states 'Create a new user with email, password, name, and optional picture URL'. The verb 'Create' and the action of adding a new user record to the database are characteristic of Write operations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_user Rate-limited

create_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": {
    "create_user": {
      "limits": [
        {
          "counter": "create_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 MCP Node Js TypeScript API, so you can run agents against it safely.

FAQ

Questions about create_user

What does the create_user tool do? +

Create a new user with email, password, name, and optional picture URL. It is categorised as a Write tool in the MCP Node Js TypeScript API 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_user? +

Register the MCP Node Js TypeScript API MCP server in PolicyLayer and add a rule for create_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 MCP Node Js TypeScript API. Nothing to install.

What risk level is create_user? +

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

Can I rate-limit create_user? +

Yes. Add a rate_limit block to the create_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 create_user completely? +

Set action: deny in the PolicyLayer policy for create_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 create_user? +

create_user is provided by the MCP Node Js TypeScript API MCP server (proffillipesilva/mcpnodefil). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.