Obtain end-of-day data for one or multiple stock tickers.
AI agents call get_end_of_day_data to retrieve information from Marketstack 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 historical financial market data (end-of-day stock prices and related metrics) for specified tickers. It is a read-only query operation that has no side effects on the underlying data or external systems. No data is created, modified, deleted, or financial transactions are executed.
From the tool's definition Tool name is 'get_end_of_day_data' and description states 'Obtain end-of-day data for one or multiple stock tickers.' The verb 'obtain' and structure indicate data retrieval with no modification or execution of external operations.
Attacks that exploit this kind of access
Obtain end-of-day data for one or multiple stock tickers. It is categorised as a Read tool in the Marketstack MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Marketstack MCP Server MCP server in PolicyLayer and add a rule for get_end_of_day_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 Marketstack MCP Server. Nothing to install.
get_end_of_day_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 get_end_of_day_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 get_end_of_day_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.
get_end_of_day_data is provided by the Marketstack MCP Server MCP server (matteoantoci/mcp-marketstack). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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