Get latest news headlines for a stock ticker
AI agents call get_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 and returns existing news headlines without creating, modifying, deleting, or executing any operations. It has no side effects and poses minimal security risk. Classification as Read is appropriate for a data retrieval function. Severity is low as misuse would only expose publicly available financial news information.
From the tool's definition Tool name 'get_news' and description 'Get latest news headlines for a stock ticker' indicate data retrieval with no modification, deletion, or execution of external operations. The tool queries and returns financial news information.
Attacks that exploit this kind of access
Get latest news headlines for a stock 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_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_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_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_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_news is provided by the Yahoo Finance MCP Server MCP server (sdpa/yahoo-finance-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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