AI agents call get_stock_news to retrieve information from StockScreen 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 news information about a stock from Yahoo Finance without creating, modifying, deleting, or executing any operations. It is a straightforward read operation that returns public financial news data. The low severity reflects that misuse would only expose information already publicly available, with no blast radius for unintended actions.
From the tool's definition Tool name 'get_stock_news' and description 'Get recent news and updates for a stock' indicate data retrieval with no modification or execution. The action is purely informational.
Documented attack patterns abuse exactly the kind of access get_stock_news gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and StockScreen MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_stock_news:
{
"version": "1",
"default": "deny",
"tools": {
"get_stock_news": {}
}
}get_stock_news is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get recent news and updates for a stock. It is categorised as a Read tool in the StockScreen MCP Server MCP Server, which means it retrieves data without modifying state.
Register the StockScreen MCP Server MCP server in PolicyLayer and add a rule for get_stock_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 StockScreen MCP Server. Nothing to install.
get_stock_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_stock_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_stock_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_stock_news is provided by the StockScreen MCP Server MCP server (twolven/mcp-stockscreen). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 4 StockScreen MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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4 StockScreen MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.