start_server · Minecraft Server MCP: Risk & Policy

WHAT IT DOES

What start_server does on Minecraft Server MCP

AI agents invoke start_server to trigger actions in Minecraft Server MCP. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why start_server needs a policy

This tool executes a consequential operation that starts a Minecraft server and enables remote command access (RCON). While the startup itself is somewhat deterministic, it represents triggering an external system with effects that depend on server state and configuration. It enables downstream administrative control (evidenced by sibling tools like execute_command, ban_player, delete_world).

From the tool's definition Tool 'start_server' initiates server startup which triggers external operations (RCON enablement, startup sequence monitoring).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

start_server Rate-limited

start_server stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "start_server": {
      "limits": [
        {
          "counter": "start_server_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about start_server

What does the start_server tool do? +

Start the Minecraft Java Edition server. Ensures RCON is enabled and waits for startup completion. It is categorised as a Execute tool in the Minecraft Server MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on start_server? +

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

What risk level is start_server? +

start_server is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit start_server? +

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

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

start_server is provided by the Minecraft Server MCP server (tamo2918/minecraft-server-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.