lookup_identifier

What lookup_identifier does on Yahoo Finance MCP Server

AI agents call lookup_identifier to retrieve information from Yahoo Finance MCP Server without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

Why lookup_identifier is rated Low

This is a lookup/search function that queries financial data based on identifiers (ticker symbols, CUSIPs, etc.). It retrieves information without side effects, matching the Read category. The blast radius is minimal as the tool only returns existing data. Given the Yahoo Finance MCP context providing 'detailed stock information,' this is clearly a read-only data retrieval tool.

From the tool's definition Tool name 'lookup_identifier' and description 'search securities information by different identifier types' indicate a data retrieval operation with no modification, creation, deletion, or execution capabilities.

The rule that runs lookup_identifier safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Yahoo Finance MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For lookup_identifier, this is the rule to start with:

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

Questions about lookup_identifier