Run a predefined Yahoo Finance stock screener such as day_gainers, day_losers, or most_actives.
AI agents call screener to retrieve information from Yahoo Finance2 without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves filtered stock listings from Yahoo Finance based on predefined screener criteria. It only fetches/queries market data with no side effects, writes, or financial transactions involved.
From the tool's definition Run a predefined Yahoo Finance stock screener such as day_gainers, day_losers, or most_actives
Attacks that exploit this kind of access
Run a predefined Yahoo Finance stock screener such as day_gainers, day_losers, or most_actives. It is categorised as a Read tool in the Yahoo Finance2 MCP Server, which means it retrieves data without modifying state.
Register the Yahoo Finance2 MCP server in PolicyLayer and add a rule for screener: 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 Finance2. Nothing to install.
screener 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 screener 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 screener. 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.
screener is provided by the Yahoo Finance2 MCP server (gadicc/yahoo-finance2). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
screener is one line of Yahoo Finance2's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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