AI agents call calculate_ac_value to retrieve information from Lottery without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves historical lottery data and performs a mathematical calculation to derive a complexity metric. It has no side effects—it only reads existing data and computes statistics from it. The AC value is purely analytical output used for lottery number analysis, with no capability to modify, delete, or execute operations on external systems.
From the tool's definition Tool name 'calculate_ac_value' and description indicate it performs calculation and analysis ('计算...AC值') on historical lottery data to produce a statistical metric (AC值/arithmetic complexity).
Attacks that exploit this kind of access
计算最近N期双色球开奖号码的AC值（算术复杂性），默认N=10。AC值反映号码的离散程度和结构复杂性，黄金区间为7-9. It is categorised as a Read tool in the Lottery MCP Server, which means it retrieves data without modifying state.
Register the Lottery MCP server in PolicyLayer and add a rule for calculate_ac_value: 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 Lottery. Nothing to install.
calculate_ac_value 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 calculate_ac_value 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 calculate_ac_value. 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.
calculate_ac_value is provided by the Lottery MCP server (lumosylva/lottery-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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