Get available expiration dates for options on an underlying stock
AI agents call option_expirations to retrieve information from Open Paper Trading MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries available options expiration dates, which is informational data retrieval with no side effects. It does not create, modify, delete, or execute any trades. Despite being part of a paper trading platform, this specific tool only reads market data, placing it firmly in the Read category with low severity.
From the tool's definition Tool description states 'Get available expiration dates for options on an underlying stock' — a pure retrieval operation with no modifications, deletions, or execution of trades.
Documented attack patterns abuse exactly the kind of access option_expirations gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Open Paper Trading MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for option_expirations:
{
"version": "1",
"default": "deny",
"tools": {
"option_expirations": {}
}
}option_expirations is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get available expiration dates for options on an underlying stock. It is categorised as a Read tool in the Open Paper Trading MCP MCP Server, which means it retrieves data without modifying state.
Register the Open Paper Trading MCP server in PolicyLayer and add a rule for option_expirations: 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 Open Paper Trading MCP. Nothing to install.
option_expirations 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_expirations 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_expirations. 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_expirations is provided by the Open Paper Trading MCP server (open-agent-tools/open-paper-trading-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Open Paper Trading MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
44 Open Paper Trading MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.