AI agents call get_market_news to retrieve information from Stock Market 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 market news data without creating, modifying, deleting, or executing any operations. It has no side effects and presents no risk of data loss, unauthorized changes, or financial transactions. The low severity reflects that misuse would only expose information already publicly available through the news API.
From the tool's definition Tool name 'get_market_news' and description 'Get the latest market news' indicate data retrieval with no modification or execution of operations. The verb 'get' and context of a financial data API (Finnhub) suggest read-only querying of news content.
Documented attack patterns abuse exactly the kind of access get_market_news gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Stock Market MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_market_news:
{
"version": "1",
"default": "deny",
"tools": {
"get_market_news": {}
}
}get_market_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 the latest market news. It is categorised as a Read tool in the Stock Market MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Stock Market MCP Server MCP server in PolicyLayer and add a rule for get_market_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 Stock Market MCP Server. Nothing to install.
get_market_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_market_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_market_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_market_news is provided by the Stock Market MCP Server MCP server (sverze/stock-market-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Stock Market MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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6 Stock Market MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.