Fetch historical OHLCV price data for a stock. Args: ticker: Stock ticker symbol start_date: Start date (YYYY-MM-DD format, optional) end_date: End date (YYYY-MM-DD format, optional)
AI agents call fetch_stock_data to retrieve information from MaverickMCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves historical stock price data (Open, High, Low, Close, Volume) which is read-only public market information. It has no side effects, does not modify data, execute commands, or commit financial transactions. The blast radius is minimal as misuse would only result in querying different historical data sets, not causing financial harm or data loss.
From the tool's definition Tool name 'fetch_stock_data' and description 'Fetch historical OHLCV price data' indicate retrieval of data without modification or execution. The arguments (ticker, start_date, end_date) are query parameters for filtering existing historical data.
Documented attack patterns abuse exactly the kind of access fetch_stock_data gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MaverickMCP, and nothing reaches the server without passing your rules. This is the rule we recommend for fetch_stock_data:
{
"version": "1",
"default": "deny",
"tools": {
"fetch_stock_data": {}
}
}fetch_stock_data is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Fetch historical OHLCV price data for a stock. Args: ticker: Stock ticker symbol start_date: Start date (YYYY-MM-DD format, optional) end_date: End date (YYYY-MM-DD format, optional). It is categorised as a Read tool in the MaverickMCP MCP Server, which means it retrieves data without modifying state.
Register the Maverick MCP server in PolicyLayer and add a rule for fetch_stock_data: 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 MaverickMCP. Nothing to install.
fetch_stock_data 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 fetch_stock_data 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 fetch_stock_data. 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.
fetch_stock_data is provided by the Maverick MCP server (wshobson/maverick-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 54 MaverickMCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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54 MaverickMCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.