AI agents call calculate_sum_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 draw data and computes a mathematical statistic (sum of red ball numbers). It is a read-only analytical operation with no ability to modify data, execute external commands, or cause irreversible changes. The blast radius of misuse is minimal—an AI agent cannot harm users or systems by requesting incorrect sum calculations on public historical lottery data.
From the tool's definition Tool name 'calculate_sum_value' and description '计算最近N期双色球开奖号码的和值（红球号码之和），默认N=10' (calculate the sum value of the most recent N periods of double-color ball lottery draw numbers, default N=10).
Attacks that exploit this kind of access
计算最近N期双色球开奖号码的和值（红球号码之和），默认N=10. 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_sum_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_sum_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_sum_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_sum_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_sum_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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