schwab_order_sell_stop

THE RISK

Critical Risk

Why schwab_order_sell_stop needs a policy

This tool executes a financial transaction — placing a stop sell order for stock through a broker API (Schwab). It commits a real financial obligation by submitting a sell order that will execute when the stop price is triggered. Misuse could result in unintended stock sales and significant financial losses.

From the tool's definition Place a stop sell order for stock

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

POLICY

How to control schwab_order_sell_stop

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_order_sell_stop:

policy.json

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

Any call to schwab_order_sell_stop 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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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_order_sell_stop

What does the schwab_order_sell_stop tool do? +

Place a stop sell order for stock. 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_order_sell_stop? +

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

schwab_order_sell_stop 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_order_sell_stop? +

Yes. Add a rate_limit block to the schwab_order_sell_stop 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_order_sell_stop completely? +

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

schwab_order_sell_stop 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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