set_gamemode · Minecraft Server MCP: Risk & Policy

WHAT IT DOES

What set_gamemode does on Minecraft Server MCP

AI agents invoke set_gamemode 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_gamemode needs a policy

Changing a player's game mode (e.g., survival, creative, spectator) is a server-side operation that modifies runtime state for a specific player. It is not purely a data write (it triggers server-side behavior changes) and not destructive or financial. The description is truncated, lowering confidence slightly.

From the tool's definition 'set_gamemode' and 'Change a player' — the description is truncated/uninformative, but the tool name implies changing a player's game mode on the server, which is an external operation with immediate effect on gameplay

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_gamemode Rate-limited

set_gamemode 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_gamemode": {
      "limits": [
        {
          "counter": "set_gamemode_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_gamemode

What does the set_gamemode tool do? +

Change a player. 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_gamemode? +

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

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

Can I rate-limit set_gamemode? +

Yes. Add a rate_limit block to the set_gamemode 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_gamemode completely? +

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

set_gamemode 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.