roll_advantage · Dice Roller MCP Server MCP: Risk & Policy

WHAT IT DOES

What roll_advantage does on Dice Roller MCP Server

AI agents call roll_advantage as a supporting operation in Dice Roller MCP Server workflows.

WHY IT NEEDS A POLICY

Why roll_advantage needs a policy

Without any rule in front of it, every call an agent makes to roll_advantage happens silently — no trail, no cap, no way to know it misbehaved until something breaks downstream.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

roll_advantage Rate-limited

roll_advantage gets a rate cap, and everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "roll_advantage": {
      "limits": [
        {
          "counter": "roll_advantage_rate",
          "window": "minute",
          "max": 60,
          "scope": "grant"
        }
      ]
    }
  }
}

SET A RULE FOR 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_advantage

What does the roll_advantage tool do? +

Roll with advantage (roll twice, take the higher result) for DnD 5e. It is categorised as a Other tool in the Dice Roller MCP Server MCP Server, which means it performs auxiliary operations.

How do I enforce a policy on roll_advantage? +

Register the Dice Roller MCP Server MCP server in PolicyLayer and add a rule for roll_advantage: 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_advantage? +

roll_advantage is a Other tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit roll_advantage? +

Yes. Add a rate_limit block to the roll_advantage 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_advantage completely? +

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

roll_advantage is provided by the Dice Roller MCP Server MCP server (swayam-mishra/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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