add_to_whitelist · OPanel MCP: Risk & Policy

WHAT IT DOES

What add_to_whitelist does on OPanel MCP

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

WHY IT NEEDS A POLICY

Why add_to_whitelist needs a policy

This tool creates or modifies the whitelist—a reversible change to server state. While it affects access permissions, it does not execute arbitrary code, delete data, or move financial assets. The moderate severity reflects that unauthorized whitelist modifications could disrupt server operations or enable/prevent player access, but the effect is containable and reversible through removal from the whitelist.

From the tool's definition Tool name 'add_to_whitelist' and description 'Add a player to the whitelist' indicate creation/modification of server access control data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_to_whitelist Rate-limited

add_to_whitelist 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_to_whitelist": {
      "limits": [
        {
          "counter": "add_to_whitelist_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 OPanel MCP, so you can run agents against it safely.

FAQ

Questions about add_to_whitelist

What does the add_to_whitelist tool do? +

Add a player to the whitelist of the Minecraft server. It is categorised as a Write tool in the OPanel MCP 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_to_whitelist? +

Register the OPanel MCP server in PolicyLayer and add a rule for add_to_whitelist: 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 OPanel MCP. Nothing to install.

What risk level is add_to_whitelist? +

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

Can I rate-limit add_to_whitelist? +

Yes. Add a rate_limit block to the add_to_whitelist 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_to_whitelist completely? +

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

add_to_whitelist is provided by the OPanel MCP server (opanel-mc/opanel-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.