AI agents call list_databases to retrieve information from Nasdaq Data Link 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 information about available databases, which is a read-only operation with no side effects. It poses minimal risk as it only exposes what databases exist in the Nasdaq Data Link system without executing code, modifying data, or accessing sensitive financial information directly. The blast radius of misuse is negligible.
From the tool's definition Tool name 'list_databases' and description 'List available databases' indicate a query operation that retrieves metadata about available datasets without modifying or executing operations.
Documented attack patterns abuse exactly the kind of access list_databases gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Nasdaq Data Link MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_databases:
{
"version": "1",
"default": "deny",
"tools": {
"list_databases": {}
}
}list_databases is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
List available databases. It is categorised as a Read tool in the Nasdaq Data Link MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Nasdaq Data Link MCP Server MCP server in PolicyLayer and add a rule for list_databases: 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 Nasdaq Data Link MCP Server. Nothing to install.
list_databases 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 list_databases 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 list_databases. 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.
list_databases is provided by the Nasdaq Data Link MCP Server MCP server (stefanoamorelli/nasdaq-data-link-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 5 Nasdaq Data Link MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
5 Nasdaq Data Link MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.