add_user · MCP JSON Database Server MCP: Risk & Policy

WHAT IT DOES

What add_user does on MCP JSON Database Server

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

WHY IT NEEDS A POLICY

Why add_user needs a policy

Creating a new user is a reversible modification operation (users can be deleted via delete_user tool on the same server). It does not irreversibly destroy data (not Destructive), does not move money (not Financial), does not execute arbitrary code (not Execute), and does modify state beyond simple queries (not Read).

From the tool's definition Tool name 'add_user' and description 'Yeni kullanıcı ekler' (Turkish: 'Adds new user') indicate creation of a user account, a reversible Write operation.

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 MCP JSON Database Server, so you can run agents against it safely.

FAQ

Questions about add_user

What does the add_user tool do? +

Yeni kullanıcı ekler. It is categorised as a Write tool in the MCP JSON Database 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 add_user? +

Register the MCP JSON Database Server 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 MCP JSON Database Server. 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 MCP JSON Database Server MCP server (yusuferenkt/mcp-database). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.