AI agents invoke roll to trigger actions in DMCP. 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.
This tool executes a computation (dice rolling) based on input notation, producing a result. It does not read stored data, write/modify state, or cause destructive/financial effects. It's a stateless calculation triggered by arguments, fitting Execute. Blast radius is minimal—it can only affect game randomness.
From the tool's definition Roll dice using standard notation
Documented attack patterns abuse exactly the kind of access roll gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and DMCP, and nothing reaches the server without passing your rules. This is the rule we recommend for roll:
{
"version": "1",
"default": "deny",
"tools": {
"roll": {
"limits": [
{
"counter": "roll_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}roll 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.
Free to start. No card required.
Roll dice using standard notation. It is categorised as a Execute tool in the DMCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the D MCP server in PolicyLayer and add a rule for roll: 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 DMCP. Nothing to install.
roll is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the roll 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.
Set action: deny in the PolicyLayer policy for roll. 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.
roll is provided by the D MCP server (shawnrushefsky/dmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from DMCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
204 DMCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.