set_game_rule · Minecraft Server MCP: Risk & Policy

WHAT IT DOES

What set_game_rule does on Minecraft Server MCP

AI agents invoke set_game_rule 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 set_game_rule needs a policy

This tool executes RCON commands on a Minecraft server to modify game rules. It triggers external operations on the server (remote command execution via RCON). While it modifies server behavior, game rules can generally be changed back, making it reversible in most cases.

From the tool's definition Set a game rule value via RCON

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_game_rule Rate-limited

set_game_rule 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": {
    "set_game_rule": {
      "limits": [
        {
          "counter": "set_game_rule_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 set_game_rule

What does the set_game_rule tool do? +

Set a game rule value via RCON. Common rules: doDaylightCycle, doWeatherCycle, doMobSpawning, keepInventory, mobGriefing, doFireTick, randomTickSpeed, playersSleepingPercentage. 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 set_game_rule? +

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

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

Can I rate-limit set_game_rule? +

Yes. Add a rate_limit block to the set_game_rule 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_game_rule completely? +

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

set_game_rule 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.