schwab_option_buy_to_open

THE RISK

Critical Risk

Why schwab_option_buy_to_open needs a policy

This tool executes a real financial transaction — purchasing an options contract through the Schwab brokerage API. Options trading involves significant financial exposure and commitment of real capital. Misuse could result in large, potentially irreversible financial losses.

From the tool's definition Buy an option to open a position (Schwab)

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

POLICY

How to control schwab_option_buy_to_open

PolicyLayer is an MCP gateway — it sits between your AI agents and Open Stocks MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for schwab_option_buy_to_open:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "schwab_option_buy_to_open": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

Any call to schwab_option_buy_to_open is blocked until a human approves it. The rest of the server keeps working.

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

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EXPLORE

Related tools and policies

More Open Stocks MCP tools

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All 152 Open Stocks MCP tools →

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Go deeper

Critical-risk tools in Open Stocks MCP → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Human-in-the-loop → When a tool call should wait for a person — and when policy can decide alone.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
How to Add Spending Controls to Any MCP Agent →
Rate Limiting MCP Tool Calls: A Practical Guide →

FAQ

Questions about schwab_option_buy_to_open

What does the schwab_option_buy_to_open tool do? +

Buy an option to open a position (Schwab). It is categorised as a Financial tool in the Open Stocks MCP MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on schwab_option_buy_to_open? +

Register the Open Stocks MCP server in PolicyLayer and add a rule for schwab_option_buy_to_open: 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 Stocks MCP. Nothing to install.

What risk level is schwab_option_buy_to_open? +

schwab_option_buy_to_open is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit schwab_option_buy_to_open? +

Yes. Add a rate_limit block to the schwab_option_buy_to_open 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 schwab_option_buy_to_open completely? +

Set action: deny in the PolicyLayer policy for schwab_option_buy_to_open. 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 schwab_option_buy_to_open? +

schwab_option_buy_to_open is provided by the Open Stocks MCP server (open-agent-tools/open-stocks-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 Stocks MCP tool call.

Start from Open Stocks 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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