Get option chain data (calls and puts) for a specific expiration. Args: symbol: Ticker symbol expiry: Expiration date (YYYY-MM-DD)
AI agents call option_chain 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 purely retrieves market data (option chain information) for analysis purposes. It has no side effects on accounts, positions, or financial obligations. While the broader server includes portfolio management and trading capabilities, this specific tool is a read-only data query. Severity is low because misuse would only expose market data without financial or operational risk.
From the tool's definition Tool description states 'Get option chain data (calls and puts)' - retrieves data with no modification, deletion, or execution of trades. Arguments are limited to symbol and expiration date, preventing execution of orders or market operations.
Documented attack patterns abuse exactly the kind of access option_chain 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_chain:
{
"version": "1",
"default": "deny",
"tools": {
"option_chain": {}
}
}option_chain is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get option chain data (calls and puts) for a specific expiration. Args: symbol: Ticker symbol expiry: Expiration date (YYYY-MM-DD). 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_chain: 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_chain 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_chain 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_chain. 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_chain 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.
Free to start. No card required.
35 Trading Skills tools catalogued and risk-classified — across an index of 42,500+ MCP servers.