schwab_check_margin_status

THE RISK

Low Risk

Why schwab_check_margin_status needs a policy

This tool retrieves and analyzes margin-call status from existing Schwab account data. It performs no writes, deletions, code execution, or financial transactions. However, the severity is elevated to 'medium' because margin status information is financially sensitive; an AI agent misusing this data to inform trading decisions could lead to poor financial outcomes.

From the tool's definition Tool name and description indicate 'check' and 'derive' operations on account balances to determine margin status—a pure query/inspection action with no modification, execution, or financial transaction capability. The tool reads existing account data.

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

POLICY

How to control schwab_check_margin_status

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_check_margin_status:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "schwab_check_margin_status": {}
  }
}

schwab_check_margin_status 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 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

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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 schwab_check_margin_status

What does the schwab_check_margin_status tool do? +

Derive margin-call status from Schwab account balances. It is categorised as a Read tool in the Open Stocks MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on schwab_check_margin_status? +

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

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

Can I rate-limit schwab_check_margin_status? +

Yes. Add a rate_limit block to the schwab_check_margin_status 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_check_margin_status completely? +

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

schwab_check_margin_status 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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