AI agents call get-randomness-by-round to retrieve information from Drand without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves data (a random value) from the drand network based on a round parameter. It has no side effects, does not modify state, execute code, delete data, or move funds. It is purely a read operation querying a specific resource. Severity is low because fetching randomness poses minimal risk even if misused by an AI agent.
From the tool's definition Tool description states 'Get the random value associated with a specific round' — a retrieval operation with no modification, deletion, or execution of arbitrary code.
Attacks that exploit this kind of access
Get the random value associated with a specfic round from drand quicknet. It is categorised as a Read tool in the Drand MCP Server, which means it retrieves data without modifying state.
Register the Drand MCP server in PolicyLayer and add a rule for get-randomness-by-round: 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 Drand. Nothing to install.
get-randomness-by-round 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 get-randomness-by-round 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 get-randomness-by-round. 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.
get-randomness-by-round is provided by the Drand MCP server (randa-mu/drand-mcp-server). 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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