roll_dice · MCP Rand MCP: Risk & Policy

WHAT IT DOES

What roll_dice does on MCP Rand

AI agents use roll_dice to create or update resources in MCP Rand — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your MCP Rand environment.

WHY IT NEEDS A POLICY

Why roll_dice needs a policy

An AI agent can call roll_dice faster than any human can review — one bad instruction and it creates or modifies resources in MCP Rand by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

roll_dice Rate-limited

roll_dice 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.

View as policy code

policy.json

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

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches MCP Rand, so you can run agents against it safely.

FAQ

Questions about roll_dice

What does the roll_dice tool do? +

Roll a set of dice using standard dice notation (e.g.,. It is categorised as a Write tool in the MCP Rand MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on roll_dice? +

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

What risk level is roll_dice? +

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

Can I rate-limit roll_dice? +

Yes. Add a rate_limit block to the roll_dice 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_dice completely? +

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

roll_dice is provided by the MCP Rand MCP server (turlockmike/mcp-rand). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.