The Hilbert Transform Instantaneous Trendline (HT_TRENDLINE) is a smoothed moving average that follows the dominant market cycle, helping traders identify trends and potential entry or exit points. You can read more about it in the Rocket Science for Traders book by John F. Ehlers.
AI agents call GetTimeSeriesHtTrendline 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 technical indicator from historical time series data. It processes existing market data to compute a smoothed moving average for analysis purposes. There are no side effects, no data modifications, no code execution on external systems, and no financial transactions. The tool simply returns computed analytical values to support trading decision-making.
From the tool's definition Tool name 'GetTimeSeriesHtTrendline' and description indicate retrieval of technical analysis indicators (Hilbert Transform Instantaneous Trendline) from financial market data.
Documented attack patterns abuse exactly the kind of access GetTimeSeriesHtTrendline 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 GetTimeSeriesHtTrendline:
{
"version": "1",
"default": "deny",
"tools": {
"GetTimeSeriesHtTrendline": {}
}
}GetTimeSeriesHtTrendline is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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The Hilbert Transform Instantaneous Trendline (HT_TRENDLINE) is a smoothed moving average that follows the dominant market cycle, helping traders identify trends and potential entry or exit points. You can read more about it in the Rocket Science for Traders book by John F. Ehlers. 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 GetTimeSeriesHtTrendline: 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.
GetTimeSeriesHtTrendline 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 GetTimeSeriesHtTrendline 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 GetTimeSeriesHtTrendline. 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.
GetTimeSeriesHtTrendline 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.