The Normalized Average True Range (NATR) is a volatility indicator that measures the average range of price movement over a specified period, expressed as a percentage of the security
AI agents call GetTimeSeriesNatr 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 retrieves and calculates a financial technical indicator (Normalized Average True Range) from historical market data. It performs a read-only query operation that returns analytical results without modifying any data, executing code, or triggering financial transactions. The low severity reflects that misuse would only expose market data, not create risk of data loss, financial harm, or system compromise.
From the tool's definition Tool name 'GetTimeSeriesNatr' uses 'Get' prefix indicating data retrieval. Description states it 'measures the average range of price movement,' a passive calculation returning historical volatility data with no side effects, state changes, or external…
Documented attack patterns abuse exactly the kind of access GetTimeSeriesNatr 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 GetTimeSeriesNatr:
{
"version": "1",
"default": "deny",
"tools": {
"GetTimeSeriesNatr": {}
}
}GetTimeSeriesNatr 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.
The Normalized Average True Range (NATR) is a volatility indicator that measures the average range of price movement over a specified period, expressed as a percentage of the security. 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 GetTimeSeriesNatr: 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.
GetTimeSeriesNatr 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 GetTimeSeriesNatr 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 GetTimeSeriesNatr. 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.
GetTimeSeriesNatr 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.