The Average True Range (ATR) is a volatility indicator that measures the average range of price movement over a specified period, helping traders assess market volatility.
AI agents call GetTimeSeriesAtr 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 financial market data (specifically the Average True Range indicator) from the Twelve Data API. It is a data retrieval operation with no side effects, no code execution, no data modification, and no financial transactions. The severity is low because misuse would only expose market data analysis metrics, not sensitive operations or destructive changes.
From the tool's definition GetTimeSeriesAtr retrieves a volatility indicator (ATR) metric from historical time series data. The tool name starts with 'Get' and the description indicates it 'measures' and 'helps assess' volatility—operations that query and retrieve data without…
Documented attack patterns abuse exactly the kind of access GetTimeSeriesAtr 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 GetTimeSeriesAtr:
{
"version": "1",
"default": "deny",
"tools": {
"GetTimeSeriesAtr": {}
}
}GetTimeSeriesAtr is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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The Average True Range (ATR) is a volatility indicator that measures the average range of price movement over a specified period, helping traders assess market volatility. 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 GetTimeSeriesAtr: 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.
GetTimeSeriesAtr 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 GetTimeSeriesAtr 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 GetTimeSeriesAtr. 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.
GetTimeSeriesAtr 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.
Free to start. No card required.
186 Twelve Data MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.