schwab_option_quote
Get a single option contract quote by expiration, strike, and type (Schwab).
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What schwab_option_quote does on Open Stocks MCP
AI agents call schwab_option_quote to retrieve information from Open Stocks MCP without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why schwab_option_quote is rated Low
This tool queries market data (an option quote) and returns information without side effects. It is a read-only retrieval operation analogous to a search or fetch. While the server provides trading capabilities (evidenced by sibling tools), this specific tool does not execute trades, modify positions, or commit financial transactions — it merely reports pricing information.
From the tool's definition Tool name 'schwab_option_quote' and description 'Get a single option contract quote' — retrieves current pricing data for an option contract specified by expiration, strike, and type. No modification, deletion, or execution of trades occurs.
Attacks that exploit this kind of access
The rule that runs schwab_option_quote safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Open Stocks MCP, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For schwab_option_quote, this is the rule to start with:
schwab_option_quote is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Open Stocks MCP, apply this rule, and every schwab_option_quote call is checked against it from then on.
Questions about schwab_option_quote
Get a single option contract quote by expiration, strike, and type (Schwab). It is categorised as a Read tool in the Open Stocks MCP MCP Server, which means it retrieves data without modifying state.
Register the Open Stocks MCP server in PolicyLayer and add a rule for schwab_option_quote: 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.
schwab_option_quote is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the schwab_option_quote 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.
Set action: deny in the PolicyLayer policy for schwab_option_quote. 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.
schwab_option_quote 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.
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