This API request returns a list of exchange traded funds families.
AI agents call GetETFsFamily 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 queries and retrieves metadata about ETF families from the Twelve Data API. It performs a read-only operation that retrieves information without creating, modifying, deleting, or executing any external operations. The data returned is informational market metadata with no capability to affect financial positions, execute trades, or modify any state.
From the tool's definition Tool name 'GetETFsFamily' and description 'returns a list of exchange traded funds families' indicate a retrieval operation with no modification or side effects.
Documented attack patterns abuse exactly the kind of access GetETFsFamily 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 GetETFsFamily:
{
"version": "1",
"default": "deny",
"tools": {
"GetETFsFamily": {}
}
}GetETFsFamily 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 families. 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 GetETFsFamily: 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.
GetETFsFamily 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 GetETFsFamily 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 GetETFsFamily. 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.
GetETFsFamily 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.