Get available strike prices for options on an underlying stock
AI agents call option_strikes 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 and returns market data (available strike prices) without creating, modifying, deleting, or executing any trades or operations. It is purely informational and read-only, with negligible risk if misused by an AI agent since it cannot affect account state or financial position.
From the tool's definition Tool name 'option_strikes' and description 'Get available strike prices for options on an underlying stock' indicate a data retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access option_strikes 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_strikes:
{
"version": "1",
"default": "deny",
"tools": {
"option_strikes": {}
}
}option_strikes 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 strike prices 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_strikes: 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_strikes 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_strikes 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_strikes. 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_strikes 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.
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44 Open Paper Trading MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.