Calculate option Greeks (delta, gamma, theta, vega, rho)
AI agents call option_greeks 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 performs mathematical calculations on option pricing parameters (Greeks are standard risk sensitivities) and returns analytical results. It retrieves or computes data without modifying account state, executing trades, or committing any financial obligations. This is a Read category tool.
From the tool's definition Tool name 'option_greeks' and description 'Calculate option Greeks (delta, gamma, theta, vega, rho)' indicate pure calculation/retrieval of financial metrics with no side effects. No data is created, modified, deleted, or financial transactions are executed.
Documented attack patterns abuse exactly the kind of access option_greeks 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_greeks:
{
"version": "1",
"default": "deny",
"tools": {
"option_greeks": {}
}
}option_greeks is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Calculate option Greeks (delta, gamma, theta, vega, rho). 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_greeks: 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_greeks 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_greeks 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_greeks. 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_greeks 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.