Get the top gainers and losers in the US stock market
AI agents call get_top_gainers_losers to retrieve information from Weather and Stock Information 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 and displays stock market data without modifying any data, executing code, deleting information, or moving money. It is purely informational—returning market statistics that are already public. The blast radius of misuse is minimal, as an AI agent using this tool cannot cause harm beyond potentially acting on the market information provided (which is the user's responsibility).
From the tool's definition Tool name 'get_top_gainers_losers' and description 'Get the top gainers and losers in the US stock market' indicate a data retrieval operation.
Attacks that exploit this kind of access
Get the top gainers and losers in the US stock market. It is categorised as a Read tool in the Weather and Stock Information MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Weather and Stock Information MCP Server MCP server in PolicyLayer and add a rule for get_top_gainers_losers: 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 Weather and Stock Information MCP Server. Nothing to install.
get_top_gainers_losers 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_top_gainers_losers 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_top_gainers_losers. 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_top_gainers_losers is provided by the Weather and Stock Information MCP Server MCP server (suraj2906/mcpserver). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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