Get historical stock data from Yahoo Finance.
AI agents call yahoo_stock_history to retrieve information from Yahoo Finance MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool fetches historical financial data from Yahoo Finance. This is a passive data retrieval operation that does not modify, delete, or execute any external actions. While the data concerns financial markets, no financial transactions, payments, or irreversible operations are performed by this tool itself.
From the tool's definition Tool description states 'Get historical stock data' — a retrieval operation with no modification, deletion, or execution of code/commands. Aligns with the Read category definition: 'retrieves or queries data; no side effects (search, list, get, fetch).'
Attacks that exploit this kind of access
Get historical stock data from Yahoo Finance. It is categorised as a Read tool in the Yahoo Finance MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Yahoo Finance MCP Server MCP server in PolicyLayer and add a rule for yahoo_stock_history: 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 Yahoo Finance MCP Server. Nothing to install.
yahoo_stock_history 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 yahoo_stock_history 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 yahoo_stock_history. 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.
yahoo_stock_history is provided by the Yahoo Finance MCP Server MCP server (shukitchan/yahoofinance-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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