register_dbserver · NDB MCP Server MCP: Risk & Policy

WHAT IT DOES

What register_dbserver does on NDB MCP Server

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

WHY IT NEEDS A POLICY

Why register_dbserver needs a policy

Registration of a database server is a state-modifying operation that creates or updates a resource relationship in the NDB management system. While reversible (evidenced by the deregister_dbserver capability), it grants the AI agent control over database server inventory and management, presenting a high severity risk if misused to register unauthorized or malicious database servers into a production environment.

From the tool's definition Tool name 'register_dbserver' and description 'Register an existing database server with NDB' indicates creation or modification of a database server registration state within the NDB system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

register_dbserver Rate-limited

register_dbserver 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": {
    "register_dbserver": {
      "limits": [
        {
          "counter": "register_dbserver_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 NDB MCP Server, so you can run agents against it safely.

FAQ

Questions about register_dbserver

What does the register_dbserver tool do? +

Register an existing database server with NDB. It is categorised as a Write tool in the NDB 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 register_dbserver? +

Register the NDB MCP Server MCP server in PolicyLayer and add a rule for register_dbserver: 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 NDB MCP Server. Nothing to install.

What risk level is register_dbserver? +

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

Can I rate-limit register_dbserver? +

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

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

register_dbserver is provided by the NDB MCP Server MCP server (rouxton/ndb-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.