Get upcoming calendar events like earnings report dates.
AI agents call get_calendar 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.
The get_calendar tool queries and returns financial calendar data (earnings dates, etc.) without creating, modifying, deleting, or executing any actions. This is a read-only data retrieval operation. While the Yahoo Finance server context involves financial data, this specific tool does not move money, commit financial obligations, or trigger trades—it only fetches publicly available calendar information.
From the tool's definition Tool retrieves 'upcoming calendar events like earnings report dates' - a passive data query with no modification, deletion, or execution of external operations.
Attacks that exploit this kind of access
Get upcoming calendar events like earnings report dates. 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_calendar: 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_calendar 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_calendar 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_calendar. 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_calendar is provided by the Yahoo Finance MCP Server MCP server (peidaqi/yfinance-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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