user_create · MongoDB Atlas MCP Server MCP: Risk & Policy

WHAT IT DOES

What user_create does on MongoDB Atlas MCP Server

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

WHY IT NEEDS A POLICY

Why user_create needs a policy

Creating database users is a reversible write operation that modifies system state by adding new authentication principals. However, it carries high severity because it can grant unauthorized access to sensitive data if misused by an AI agent. The blast radius extends to potential data breaches if the agent creates overprivileged users or users for malicious purposes.

From the tool's definition Tool name 'user_create' and description 'Create a new database user' indicate creation of a new user account with database access permissions.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

user_create Rate-limited

user_create 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": {
    "user_create": {
      "limits": [
        {
          "counter": "user_create_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 MongoDB Atlas MCP Server, so you can run agents against it safely.

FAQ

Questions about user_create

What does the user_create tool do? +

Create a new database user. It is categorised as a Write tool in the MongoDB Atlas 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 user_create? +

Register the MongoDB Atlas MCP Server MCP server in PolicyLayer and add a rule for user_create: 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 MongoDB Atlas MCP Server. Nothing to install.

What risk level is user_create? +

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

Can I rate-limit user_create? +

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

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

user_create is provided by the MongoDB Atlas MCP Server MCP server (montumodi/mongodb-atlas-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.