List available option expiration dates for a symbol. Args: symbol: Ticker symbol
AI agents call option_expiries to retrieve information from Trading Skills without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves publicly available market data (option expiration dates) for a given ticker symbol. It has no side effects, does not modify data, execute trades, or incur financial obligations. It is purely informational, making it a Read category tool with low severity even in the context of a trading platform.
From the tool's definition Tool description states 'List available option expiration dates for a symbol' - a retrieval operation that queries option market data without modification or execution of trades.
Documented attack patterns abuse exactly the kind of access option_expiries gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Trading Skills, and nothing reaches the server without passing your rules. This is the rule we recommend for option_expiries:
{
"version": "1",
"default": "deny",
"tools": {
"option_expiries": {}
}
}option_expiries is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List available option expiration dates for a symbol. Args: symbol: Ticker symbol. It is categorised as a Read tool in the Trading Skills MCP Server, which means it retrieves data without modifying state.
Register the Trading Skills MCP server in PolicyLayer and add a rule for option_expiries: 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 Trading Skills. Nothing to install.
option_expiries 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 option_expiries 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 option_expiries. 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.
option_expiries is provided by the Trading Skills MCP server (staskh/trading_skills). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 35 Trading Skills tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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35 Trading Skills tools catalogued and risk-classified — across an index of 42,500+ MCP servers.