get_option_chain
AI agents call get_option_chain to retrieve information from Yahoo Finance MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves options chain data (strike prices, expiration dates, bid-ask spreads, open interest, etc.) without modifying, executing external operations, or committing financial transactions. It is a passive data lookup similar to other sibling tools on the server. The 'get_' prefix and alignment with other read-only financial data tools confirm Read category.
From the tool's definition Tool name 'get_option_chain' indicates retrieval of options chain data. Server description states it 'provides access to...options data' and lists similar sibling tools like 'get_option_expiration_dates' and 'get_recommendations' that are all read-only data…
Attacks that exploit this kind of access
get_option_chain. It is categorised as a Read tool in the Yahoo Finance MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Yahoo Finance MCP Server MCP server in PolicyLayer and add a rule for get_option_chain: 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 Yahoo Finance MCP Server. Nothing to install.
get_option_chain 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 get_option_chain 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 get_option_chain. 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.
get_option_chain is provided by the Yahoo Finance MCP Server MCP server (laxmimerit/yahoo-finance-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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