roll_check · ChatRPG MCP: Risk & Policy

WHAT IT DOES

What roll_check does on ChatRPG

AI agents invoke roll_check to trigger actions in ChatRPG. 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 roll_check needs a policy

This tool executes a randomized dice-roll computation to produce game results. It doesn't read stored data, write/modify persistent data, or perform destructive/financial actions. It falls under Execute because it triggers an external operation (dice roll resolution) whose output depends on arguments like check type and modifiers.

From the tool's definition 'Roll D&D 5e checks including skill checks, ability checks, saving throws, attack rolls, and initiative' — triggers a dice-rolling computation/operation

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

roll_check Rate-limited

roll_check 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": {
    "roll_check": {
      "limits": [
        {
          "counter": "roll_check_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 ChatRPG, so you can run agents against it safely.

FAQ

Questions about roll_check

What does the roll_check tool do? +

Roll D&D 5e checks including skill checks, ability checks, saving throws, attack rolls, and initiative. It is categorised as a Execute tool in the ChatRPG MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on roll_check? +

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

What risk level is roll_check? +

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

Can I rate-limit roll_check? +

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

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

roll_check is provided by the ChatRPG MCP server (mnehmos/mnehmos.chatrpg.game). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.