npm_create_certificate_custom · Nginx Manager MCP

WHAT IT DOES

What npm_create_certificate_custom does on Nginx Manager

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

WHY IT NEEDS A POLICY

Why npm_create_certificate_custom needs a policy

This tool creates a new certificate record in the Nginx Proxy Manager system. While certificate management is infrastructure-related and could have high impact if misconfigured (affecting TLS/HTTPS for proxied services), the operation itself is reversible—certificates can be deleted (evidenced by npm_delete_certificate in the sibling tools). This qualifies as Write rather than Execute or Destructive.

From the tool's definition Create a custom certificate record. File upload must follow via npm_upload_certificate. The tool name contains 'create' and the description explicitly states it creates a certificate record, which is a reversible data modification operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

npm_create_certificate_custom Rate-limited

npm_create_certificate_custom 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": {
    "npm_create_certificate_custom": {
      "limits": [
        {
          "counter": "npm_create_certificate_custom_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Nginx Manager, so you can run agents against it safely.

FAQ

Questions about npm_create_certificate_custom

What does the npm_create_certificate_custom tool do? +

Create a custom certificate record. File upload must follow via npm_upload_certificate. It is categorised as a Write tool in the Nginx Manager MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on npm_create_certificate_custom? +

Register the Nginx Manager MCP server in PolicyLayer and add a rule for npm_create_certificate_custom: 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 Nginx Manager. Nothing to install.

What risk level is npm_create_certificate_custom? +

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

Can I rate-limit npm_create_certificate_custom? +

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

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

npm_create_certificate_custom is provided by the Nginx Manager MCP server (kognar-ai/ngnix-manager-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.