แสดงรายชื่อหุ้นทั้งหมดใน DB
AI agents call list_stocks to retrieve information from Yahoo Finance without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and displays stock information from a database. It performs a read-only operation that queries existing data without creating, modifying, deleting, or executing any code. The blast radius of misuse is minimal—an AI agent could retrieve stock data repeatedly but cannot cause financial transactions, data loss, or external system changes.
From the tool's definition Tool description states 'แสดงรายชื่อหุ้นทั้งหมดใน DB' (displays/lists all stocks in the database). The name 'list_stocks' and action of retrieving/displaying data indicates a query operation with no side effects.
Attacks that exploit this kind of access
แสดงรายชื่อหุ้นทั้งหมดใน DB. It is categorised as a Read tool in the Yahoo Finance MCP Server, which means it retrieves data without modifying state.
Register the Yahoo Finance MCP server in PolicyLayer and add a rule for list_stocks: 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. Nothing to install.
list_stocks 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 list_stocks 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 list_stocks. 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.
list_stocks is provided by the Yahoo Finance MCP server (itjung-source/yahoo-finance-mcp). 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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