Roll a d20 with advantage (roll twice, take higher) with optional modifier.
AI agents call roll_advantage to retrieve information from Dice Roller MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool reads/generates random values and performs a calculation (rolling twice and selecting the higher result) with an optional modifier. It does not create, modify, delete, or execute any external operations. The output is purely informational for game mechanics and has no persistent effects or state changes. This is a read-like operation—specifically, generating and querying a result.
From the tool's definition Tool performs dice rolling functionality: 'Roll a d20 with advantage (roll twice, take higher) with optional modifier.' This is a computational operation that generates random numbers and returns results without any side effects, data modification, code…
Attacks that exploit this kind of access
Roll a d20 with advantage (roll twice, take higher) with optional modifier. It is categorised as a Read tool in the Dice Roller MCP Server MCP Server, which means it retrieves data without modifying state.
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.
roll_advantage is a Read tool with low risk. Read-only tools are generally safe to allow by default.
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.
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.
roll_advantage 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.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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