advance_turn

THE RISK

Medium Risk

Why advance_turn needs a policy

This tool updates the combat encounter state (turn order/initiative tracking) within the RPG engine. It is a reversible modification to in-game data stored in SQLite. No code execution, deletion, or financial action is involved. Blast radius is low since it only affects a game session's state.

From the tool's definition Advance to the next combatant — modifies game state by progressing turn order in an encounter

Documented attack patterns abuse exactly the kind of access advance_turn gives an agent:

POLICY

How to control advance_turn

PolicyLayer is an MCP gateway — it sits between your AI agents and Rpg, and nothing reaches the server without passing your rules. This is the rule we recommend for advance_turn:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "advance_turn": {
      "limits": [
        {
          "counter": "advance_turn_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

advance_turn 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.

Create a free account and register Rpg — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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All 47 Rpg tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about advance_turn

What does the advance_turn tool do? +

Advance to the next combatant\. It is categorised as a Write tool in the Rpg MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on advance_turn? +

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

What risk level is advance_turn? +

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

Can I rate-limit advance_turn? +

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

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

advance_turn is provided by the Rpg MCP server (mnehmos/mnehmos.rpg.mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Rpg tool call.

Start from Rpg, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →