roll_check · Dice Roller MCP Server MCP: Risk & Policy

WHAT IT DOES

What roll_check does on Dice Roller MCP Server

AI agents invoke roll_check to trigger actions in Dice Roller MCP Server. 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 operation and applies game logic (modifier addition, DC comparison). It has no data persistence, financial, or destructive implications. The Execute category fits because it performs a computation/operation rather than simply reading stored data. Severity is low as the blast radius of misuse is negligible — it only produces a random number result.

From the tool's definition 'Make a skill check against a DC with a d20 roll plus modifier' — triggers a dice roll operation (execution of random number generation and comparison logic)

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 Dice Roller MCP Server, so you can run agents against it safely.

FAQ

Questions about roll_check

What does the roll_check tool do? +

Make a skill check against a DC with a d20 roll plus modifier. It is categorised as a Execute tool in the Dice Roller MCP Server 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 Dice Roller MCP Server 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 Dice Roller MCP Server. 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 Dice Roller MCP Server MCP server (ltcg-addict/dice-roller). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.