The Hilbert Transform Trend vs Cycle Mode (HT_TRENDMODE) distinguishes between trending and cyclical market phases, helping traders adapt their strategies accordingly. You can read more about it in the Rocket Science for Traders book by John F. Ehlers.
AI agents call GetTimeSeriesHtTrendMode 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 analyzes financial market data using the Hilbert Transform technical indicator. It reads existing time series data and returns computed trend/cycle classifications. There are no side effects, data modifications, deletions, code execution, or financial transactions involved. The tool is purely informational and analytical in nature, making it a Read category risk with low severity.
From the tool's definition Tool name 'GetTimeSeriesHtTrendMode' uses 'Get' prefix and description states it 'distinguishes between trending and cyclical market phases' - a data retrieval and analysis operation with no modification, deletion, or financial transaction capabilities.
Documented attack patterns abuse exactly the kind of access GetTimeSeriesHtTrendMode 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 GetTimeSeriesHtTrendMode:
{
"version": "1",
"default": "deny",
"tools": {
"GetTimeSeriesHtTrendMode": {}
}
}GetTimeSeriesHtTrendMode 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 Hilbert Transform Trend vs Cycle Mode (HT_TRENDMODE) distinguishes between trending and cyclical market phases, helping traders adapt their strategies accordingly. 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 GetTimeSeriesHtTrendMode: 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.
GetTimeSeriesHtTrendMode 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 GetTimeSeriesHtTrendMode 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 GetTimeSeriesHtTrendMode. 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.
GetTimeSeriesHtTrendMode 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.