AI agents call trend_reversion_screener 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.
This is a data retrieval and analysis tool that screens stocks based on technical trend indicators. It queries Finviz data to identify securities matching trend reversion criteria, returning results for user review. No data modification, code execution, deletions, or financial transactions occur.
From the tool's definition Tool name 'trend_reversion_screener' and description indicating screening for trend reversion candidates (トレンド反転候補銘柄のスクリーニング translates to 'screening for trend reversion candidate securities').
Documented attack patterns abuse exactly the kind of access trend_reversion_screener 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 trend_reversion_screener:
{
"version": "1",
"default": "deny",
"tools": {
"trend_reversion_screener": {}
}
}trend_reversion_screener is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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トレンド反転候補銘柄のスクリーニング. 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 trend_reversion_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 Finviz MCP Server. Nothing to install.
trend_reversion_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 trend_reversion_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 trend_reversion_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.
trend_reversion_screener 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.
Free to start. No card required.
35 Finviz MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.