AI agents call calculate_peg_ratio to retrieve information from A Share without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs mathematical computation on retrieved financial metrics (Price-to-Earnings ratio and net profit growth rate) to produce an analytical output (PEG ratio). It is a read-only analytical operation with no side effects, no code execution, and no data persistence changes. The tool assists in stock valuation analysis but does not create orders, execute trades, or modify any data.
From the tool's definition Tool name 'calculate_peg_ratio' and description 'PEG = PE / 净利润增长率' (PEG = PE / net profit growth rate) indicate a pure calculation function that derives a financial ratio from existing data.
Attacks that exploit this kind of access
计算PEG比率（市盈率相对盈利增长比率），PEG = PE / 净利润增长率。. It is categorised as a Read tool in the A Share MCP Server, which means it retrieves data without modifying state.
Register the A Share MCP server in PolicyLayer and add a rule for calculate_peg_ratio: 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 A Share. Nothing to install.
calculate_peg_ratio 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_peg_ratio 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_peg_ratio. 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_peg_ratio is provided by the A Share MCP server (kissjerryfan/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.
Teams ship this data inside their own products. See what a licence covers →