option_chain

THE RISK

Low Risk

Why option_chain needs a policy

This tool retrieves options market data (strike prices, implied volatility, Greeks, etc.) for analysis purposes. It performs a query operation on market data without creating, modifying, deleting, or executing any trades. Even in the context of a trading platform, requesting options chain data is a read-only operation with no side effects on accounts, positions, or financial obligations.

From the tool's definition Tool name 'option_chain' and description 'Get complete options chain for an underlying stock' indicates data retrieval with no modification or execution of trades.

Documented attack patterns abuse exactly the kind of access option_chain gives an agent:

POLICY

How to control option_chain

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_chain:

policy.json

{
  "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.

Create a free account and register Open Paper Trading MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Open Paper Trading MCP tools

Financial buy_option_limit Place a limit buy order for an option Financial buy_stock buy_stock Financial buy_stock_limit Place a limit buy order for stocks Financial option_credit_spread option_credit_spread Financial option_debit_spread option_debit_spread Financial sell_option_limit Place a limit sell order for an option Financial sell_stock sell_stock Financial sell_stock_limit Place a limit sell order for stocks

All 44 Open Paper Trading MCP tools →

Read tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about option_chain

What does the option_chain tool do? +

Get complete options chain for 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.

How do I enforce a policy on option_chain? +

Register the Open Paper Trading 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 Open Paper Trading MCP. Nothing to install.

What risk level is option_chain? +

option_chain is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit option_chain? +

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.

How do I block option_chain completely? +

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.

What MCP server provides option_chain? +

option_chain 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.

Enforce policy on every Open Paper Trading MCP tool call.

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.

CHECK YOUR STACK →