Get the most actively traded stocks based on volume.
AI agents call equity_discovery_active to retrieve information from Agent Fin without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves historical or real-time trading data (volume statistics) to inform users about market activity. It performs no modifications, deletions, financial transactions, or code execution. It is purely a data retrieval function with no adverse effects on any system or data state.
From the tool's definition Tool name 'equity_discovery_active' and description 'Get the most actively traded stocks based on volume' indicate a retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access equity_discovery_active gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Agent Fin, and nothing reaches the server without passing your rules. This is the rule we recommend for equity_discovery_active:
{
"version": "1",
"default": "deny",
"tools": {
"equity_discovery_active": {}
}
}equity_discovery_active is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get the most actively traded stocks based on volume. It is categorised as a Read tool in the Agent Fin MCP Server, which means it retrieves data without modifying state.
Register the Agent Fin MCP server in PolicyLayer and add a rule for equity_discovery_active: 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 Agent Fin. Nothing to install.
equity_discovery_active 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 equity_discovery_active 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 equity_discovery_active. 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.
equity_discovery_active is provided by the Agent Fin MCP server (markchiang/agent-fin). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Agent Fin, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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24 Agent Fin tools catalogued and risk-classified — across an index of 43,000+ MCP servers.