AI agents call get_sector_performance to retrieve information from Finviz MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool queries and retrieves financial performance data by sector—a read-only operation with no side effects, no code execution, and no financial transactions. It belongs in the Read category (retrieves/queries data). Severity is low because misuse would only expose publicly available market data, posing minimal risk even if an AI agent queries it excessively or with malformed requests.
From the tool's definition Tool name 'get_sector_performance' and description indicating sector performance analysis. Finviz is a financial data provider; this tool retrieves and queries sector-level market performance metrics without modifying data or executing trades.
Documented attack patterns abuse exactly the kind of access get_sector_performance gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Finviz MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_sector_performance:
{
"version": "1",
"default": "deny",
"tools": {
"get_sector_performance": {}
}
}get_sector_performance is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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セクター別パフォーマンス分析. It is categorised as a Read tool in the Finviz MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Finviz MCP Server MCP server in PolicyLayer and add a rule for get_sector_performance: 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 Finviz MCP Server. Nothing to install.
get_sector_performance 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_sector_performance 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_sector_performance. 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_sector_performance is provided by the Finviz MCP Server MCP server (tradermonty/finviz-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 35 Finviz MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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35 Finviz MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.