Fetch the available options expiration dates for a given ticker symbol.
AI agents call get_option_expiration_dates 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.
This tool retrieves metadata about options contracts (expiration dates) for a ticker symbol. It performs a read-only query of financial reference data without creating, modifying, deleting, or executing any transactions. The blast radius of misuse is minimal—an AI agent cannot cause financial harm, data loss, or unintended operations by calling this tool with various ticker symbols.
From the tool's definition Tool name 'get_option_expiration_dates' and description 'Fetch the available options expiration dates' indicate a retrieval operation. The verb 'fetch' and the passive data retrieval nature align with querying market reference data with no side effects.
Attacks that exploit this kind of access
Fetch the available options expiration dates for a given ticker symbol. 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_option_expiration_dates: 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_option_expiration_dates 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_option_expiration_dates 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_option_expiration_dates. 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_option_expiration_dates is provided by the Yahoo Finance MCP Server MCP server (laxmimerit/yahoo-finance-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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