update_room_node

THE RISK

Medium Risk

Why update_room_node needs a policy

This tool modifies game world state (room metadata) but does so reversibly and selectively. It does not delete data, execute arbitrary code, or move resources. The 'partial' nature and explicit constraints indicate this is a controlled Write operation.

From the tool's definition Tool name is 'update_room_node' and description states it 'Partially update room metadata' — this is a modification operation that creates or alters data.

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

POLICY

How to control update_room_node

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 update_room_node:

policy.json

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

update_room_node 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

Related tools and policies

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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 update_room_node

What does the update_room_node tool do? +

Partially update room metadata without replacing exits, entities, or visit state. 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 update_room_node? +

Register the Rpg MCP server in PolicyLayer and add a rule for update_room_node: 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 update_room_node? +

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

Can I rate-limit update_room_node? +

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

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

update_room_node 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 →