This API request returns a list of exchange traded funds available at Twelve Data. Sorting is in descending order by total assets value. The list is updated daily.
AI agents call GetETFsList to retrieve information from Twelve Data MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a simple data retrieval operation—querying and returning a listing of ETFs sorted by total assets value. It has no side effects, does not modify data, execute commands, incur financial transactions, or delete anything. The data appears to be reference information updated daily. It is purely informational and poses minimal security risk if an AI agent calls it with any arguments.
From the tool's definition Tool returns 'a list of exchange traded funds available at Twelve Data.' It retrieves publicly available, read-only data with 'no modification of state. The verb 'returns' and 'list' are characteristic of Read operations.
Documented attack patterns abuse exactly the kind of access GetETFsList gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Twelve Data MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for GetETFsList:
{
"version": "1",
"default": "deny",
"tools": {
"GetETFsList": {}
}
}GetETFsList is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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This API request returns a list of exchange traded funds available at Twelve Data. Sorting is in descending order by total assets value. The list is updated daily. It is categorised as a Read tool in the Twelve Data MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Twelve Data MCP Server MCP server in PolicyLayer and add a rule for GetETFsList: 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 Twelve Data MCP Server. Nothing to install.
GetETFsList 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 GetETFsList 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 GetETFsList. 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.
GetETFsList is provided by the Twelve Data MCP Server MCP server (twelvedata/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 186 Twelve Data MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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186 Twelve Data MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.