AI agents call get_stock_valuation_ratios to retrieve information from CasualMarket without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves valuation ratio data for analysis purposes. Despite the empty description, the naming pattern and sibling tools strongly indicate it is a read-only query that fetches historical or current financial metrics. No write, execution, deletion, or financial transaction capabilities are evident.
From the tool's definition Tool name 'get_stock_valuation_ratios' indicates data retrieval. The server context shows it is part of a financial analysis suite alongside other read-only tools like 'get_company_balance_sheet', 'get_company_income_statement', 'get_company_profile', and…
Documented attack patterns abuse exactly the kind of access get_stock_valuation_ratios gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and CasualMarket, and nothing reaches the server without passing your rules. This is the rule we recommend for get_stock_valuation_ratios:
{
"version": "1",
"default": "deny",
"tools": {
"get_stock_valuation_ratios": {}
}
}get_stock_valuation_ratios is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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get_stock_valuation_ratios. It is categorised as a Read tool in the CasualMarket MCP Server, which means it retrieves data without modifying state.
Register the CasualMarket MCP server in PolicyLayer and add a rule for get_stock_valuation_ratios: 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 CasualMarket. Nothing to install.
get_stock_valuation_ratios 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_stock_valuation_ratios 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_stock_valuation_ratios. 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_stock_valuation_ratios is provided by the CasualMarket MCP server (sacahan/casualmarket). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from CasualMarket, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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23 CasualMarket tools catalogued and risk-classified — across an index of 43,000+ MCP servers.