AI agents call get_valuation_metrics to retrieve information from Cn Financial without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only query of financial metrics (price-to-earnings, price-to-book, price-to-sales ratios and their historical time series). It retrieves existing data without creating, modifying, or deleting anything. The blast radius of misuse is minimal—an AI agent could only access or excessively query publicly available financial data. No side effects, no irreversible actions, no financial transactions.
From the tool's definition Tool name 'get_valuation_metrics' and description indicate it retrieves historical valuation metrics (PE, PB, PS ratios and time series) for stocks. The verb '获取' (get/retrieve) confirms data retrieval with no modification capability.
Documented attack patterns abuse exactly the kind of access get_valuation_metrics gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Cn Financial, and nothing reaches the server without passing your rules. This is the rule we recommend for get_valuation_metrics:
{
"version": "1",
"default": "deny",
"tools": {
"get_valuation_metrics": {}
}
}get_valuation_metrics is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
获取股票历史估值指标（PE、PB、PS等市盈率/市净率/市销率时间序列）。. It is categorised as a Read tool in the Cn Financial MCP Server, which means it retrieves data without modifying state.
Register the Cn Financial MCP server in PolicyLayer and add a rule for get_valuation_metrics: 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 Cn Financial. Nothing to install.
get_valuation_metrics 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 get_valuation_metrics 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 get_valuation_metrics. 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.
get_valuation_metrics is provided by the Cn Financial MCP server (ccq1/cn-financial-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Cn Financial, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
42 Cn Financial tools catalogued and risk-classified — across an index of 43,000+ MCP servers.