Get comprehensive stock information for a ticker
AI agents call get_stock_info 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.
This tool retrieves publicly available stock information without creating, modifying, deleting, executing code, or conducting financial transactions. It is a straightforward data query operation with no side effects. The blast radius of misuse is minimal—an attacker could gather market intelligence but cannot manipulate markets, steal funds, or damage systems.
From the tool's definition Tool name 'get_stock_info' and description 'Get comprehensive stock information for a ticker' indicate data retrieval with no modification or execution.
Attacks that exploit this kind of access
Get comprehensive stock information for a ticker. 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 get_stock_info: 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.
get_stock_info 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_info 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_info. 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_info is provided by the Yahoo Finance MCP Server MCP server (refself/yahoo-finance-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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