schwab_stream_option_quotes

THE RISK

Low Risk

Why schwab_stream_option_quotes needs a policy

This tool retrieves market data (option quotes) in real-time from a broker's streaming service. It performs a read-only query operation that does not create, modify, delete, or execute any actions. The 'snapshots' terminology further confirms it captures a point-in-time data view without altering state.

From the tool's definition The tool description explicitly states it 'Get[s] real-time option quote snapshots from Schwab streaming.' The verb 'Get' and noun 'snapshots' indicate data retrieval with no modification or side effects.

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

POLICY

How to control schwab_stream_option_quotes

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_stream_option_quotes:

policy.json

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

schwab_stream_option_quotes 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.

CAP THIS TOOL →

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EXPLORE

Related tools and policies

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All 152 Open Stocks 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 schwab_stream_option_quotes

What does the schwab_stream_option_quotes tool do? +

Get real-time option quote snapshots from Schwab streaming. 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_stream_option_quotes? +

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

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

Can I rate-limit schwab_stream_option_quotes? +

Yes. Add a rate_limit block to the schwab_stream_option_quotes 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_stream_option_quotes completely? +

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

schwab_stream_option_quotes 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.

CHECK YOUR STACK →