Sample a random subset of items or records securely using the requested entropy_source, defaulting to server_csprng via auto. Generates proof_url and proof_json_url.
Part of the QnEvt Verifiable Randomness MCP server.
Free to start. No card required.
AI agents call qnevt_audit_sample to retrieve information from QnEvt Verifiable Randomness MCP without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though qnevt_audit_sample only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"qnevt_audit_sample": {}
}
}See the full QnEvt Verifiable Randomness MCP policy for all 7 tools.
These attack patterns abuse exactly the kind of access qnevt_audit_sample gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Sample a random subset of items or records securely using the requested entropy_source, defaulting to server_csprng via auto. Generates proof_url and proof_json_url.. It is categorised as a Read tool in the QnEvt Verifiable Randomness MCP MCP Server, which means it retrieves data without modifying state.
Register the QnEvt Verifiable Randomness MCP server in PolicyLayer and add a rule for qnevt_audit_sample: 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 QnEvt Verifiable Randomness MCP. Nothing to install.
qnevt_audit_sample 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 qnevt_audit_sample 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 qnevt_audit_sample. 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.
qnevt_audit_sample is provided by the QnEvt Verifiable Randomness MCP server (https://qnevt.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 7 QnEvt Verifiable Randomness MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.