set_server_property · Minecraft Server MCP: Risk & Policy

WHAT IT DOES

What set_server_property does on Minecraft Server MCP

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

WHY IT NEEDS A POLICY

Why set_server_property needs a policy

This tool creates or modifies server configuration reversibly. While changes require a server restart, they are not destructive (can be reverted by setting properties back) and do not execute arbitrary code or trigger external systems.

From the tool's definition Tool description states 'Set a server.properties value' — a modification operation. The list of modifiable properties (gamemode, difficulty, max-players, pvp, spawn-protection, etc.) confirms reversible configuration changes, not data deletion or code…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_server_property Rate-limited

set_server_property 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": {
    "set_server_property": {
      "limits": [
        {
          "counter": "set_server_property_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 Minecraft Server MCP, so you can run agents against it safely.

FAQ

Questions about set_server_property

What does the set_server_property tool do? +

Set a server.properties value. The server must be restarted for changes to take effect. Common properties: gamemode, difficulty, level-seed, level-type, max-players, view-distance, motd, online-mode, pvp, spawn-protection. It is categorised as a Write tool in the Minecraft Server 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 set_server_property? +

Register the Minecraft Server MCP server in PolicyLayer and add a rule for set_server_property: 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 set_server_property? +

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

Can I rate-limit set_server_property? +

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

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

set_server_property 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.