extreme_value_variate
AI agents call extreme_value_variate to retrieve information from FortunaMCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves/generates random values with no side effects on external state. It does not modify, delete, execute commands, or move money. Classification as Read reflects that it returns data without causing external state changes. Severity is low because misuse by an AI agent would at worst produce statistically skewed random numbers with no destructive consequences.
From the tool's definition Tool name 'extreme_value_variate' and sibling tools (bernoulli_variate, beta_variate, gamma_variate, etc.) are statistical distribution generators. The server description states the purpose is 'generating high-quality random values' using a RNG engine.
Attacks that exploit this kind of access
extreme_value_variate. It is categorised as a Read tool in the FortunaMCP MCP Server, which means it retrieves data without modifying state.
Register the Fortuna MCP server in PolicyLayer and add a rule for extreme_value_variate: 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 FortunaMCP. Nothing to install.
extreme_value_variate 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 extreme_value_variate 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 extreme_value_variate. 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.
extreme_value_variate is provided by the Fortuna MCP server (siliconsociety/fortunamcp). 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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