Get option expiration dates for a symbol.
AI agents call schwab_option_expirations to retrieve information from Open Stocks MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only queries and returns informational data (expiration dates) about options contracts. It performs no writes, deletions, executions, or financial operations. Misuse would only expose market data already publicly available, posing minimal risk to the user or system.
From the tool's definition The tool retrieves option expiration dates for a given symbol. The verb 'Get' and the description indicate a data retrieval operation with no modification, creation, deletion, or financial transaction components.
Documented attack patterns abuse exactly the kind of access schwab_option_expirations gives an agent:
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_option_expirations:
{
"version": "1",
"default": "deny",
"tools": {
"schwab_option_expirations": {}
}
}schwab_option_expirations is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get option expiration dates for a symbol. 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_expirations: 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_expirations 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_expirations 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_expirations. 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_expirations 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.
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.
Free to start. No card required.
152 Open Stocks MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.