schwab_cancel_option_order

THE RISK

Critical Risk

Why schwab_cancel_option_order needs a policy

Cancelling an option order is an irreversible action that permanently terminates a live financial order. While it doesn't move money directly, cancelling an order cannot be undone — the order is gone and market conditions may have changed, making it impossible to restore the original order state. This falls under Destructive due to its irreversible nature, though it borders on Financial given the trading context.

From the tool's definition Cancel a specific option order

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

POLICY

How to control schwab_cancel_option_order

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_cancel_option_order:

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "schwab_cancel_option_order"
  ]
}

schwab_cancel_option_order disappears from the agent's tool list entirely, and any attempt to call it is denied. 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

Financial schwab_order_sell_stop Place a stop sell order for stock. Financial sell_stock_stop_loss Places a stop loss sell order for a stock. Financial buy_option_limit Places a limit buy order for an option. Financial buy_stock_limit Places a limit buy order for a stock. Financial buy_stock_market Places a market buy order for a stock. Financial option_credit_spread option_credit_spread Financial option_debit_spread option_debit_spread Financial schwab_buy_stock_limit Place a limit buy order for stock.

All 152 Open Stocks MCP tools →

Destructive tools on other servers

Android Forensics ADB MCP Server create_full_backup 0xarchive web3_revoke_key Frida Game Hacking MCP clear_scan cPanel MCP Server clear_spam_box

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.
Blast radius → How much damage one compromised or confused agent can do — and how to bound it.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about schwab_cancel_option_order

What does the schwab_cancel_option_order tool do? +

Cancel a specific option order. It is categorised as a Destructive tool in the Open Stocks MCP MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on schwab_cancel_option_order? +

Register the Open Stocks MCP server in PolicyLayer and add a rule for schwab_cancel_option_order: 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_cancel_option_order? +

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

Can I rate-limit schwab_cancel_option_order? +

Yes. Add a rate_limit block to the schwab_cancel_option_order 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_cancel_option_order completely? +

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

schwab_cancel_option_order 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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