Get latest news for a ticker
AI agents call get_yahoo_finance_news 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 news information for a given ticker symbol. It performs a query operation that returns data without modifying, deleting, or executing any external systems. The blast radius of misuse is minimal—an agent could fetch news for any ticker, but cannot cause financial harm, data loss, or unauthorized actions. Classified as Read with low severity.
From the tool's definition Tool name 'get_yahoo_finance_news' and description 'Get latest news for a ticker' indicate retrieval of news data with no side effects.
Attacks that exploit this kind of access
Get latest news 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_yahoo_finance_news: 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_yahoo_finance_news 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_yahoo_finance_news 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_yahoo_finance_news. 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_yahoo_finance_news 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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