The Hilbert Transform Dominant Cycle Phase (HT_DCPHASE) measures the current phase of the dominant market cycle, helping traders identify potential entry and exit points in relation to the cycle. You can read more about it in the Rocket Science for Traders book by John F. Ehlers.
AI agents call GetTimeSeriesHtDcPhase 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 financial market analysis data (Hilbert Transform Dominant Cycle Phase metric) without creating orders, modifying positions, executing transactions, or deleting data.
From the tool's definition Tool name 'GetTimeSeriesHtDcPhase' uses 'Get' prefix indicating data retrieval. Description states it 'measures the current phase' and 'helps traders identify' - passive analysis without modifying, deleting, or executing trades.
Documented attack patterns abuse exactly the kind of access GetTimeSeriesHtDcPhase 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 GetTimeSeriesHtDcPhase:
{
"version": "1",
"default": "deny",
"tools": {
"GetTimeSeriesHtDcPhase": {}
}
}GetTimeSeriesHtDcPhase 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 Dominant Cycle Phase (HT_DCPHASE) measures the current phase of the dominant market cycle, helping traders identify potential entry and exit points in relation to the cycle. 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 GetTimeSeriesHtDcPhase: 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.
GetTimeSeriesHtDcPhase 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 GetTimeSeriesHtDcPhase 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 GetTimeSeriesHtDcPhase. 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.
GetTimeSeriesHtDcPhase 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.