The MACD Extension (MACDEXT) is a customizable version of the MACD indicator, allowing traders to choose different moving average types and parameters for increased flexibility.
AI agents call GetTimeSeriesMacdExt 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.
GetTimeSeriesMacdExt is a financial data retrieval tool that computes and returns a technical indicator (MACD) based on user-supplied parameters. It performs calculation and data retrieval with no side effects—no writes, deletions, or financial transactions. The parameters customize the calculation, but the tool itself only returns computed analytical data.
From the tool's definition Tool returns customizable MACD technical indicator data based on historical time series. The description indicates it 'allows traders to choose different moving average types and parameters' for analysis.
Documented attack patterns abuse exactly the kind of access GetTimeSeriesMacdExt 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 GetTimeSeriesMacdExt:
{
"version": "1",
"default": "deny",
"tools": {
"GetTimeSeriesMacdExt": {}
}
}GetTimeSeriesMacdExt is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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The MACD Extension (MACDEXT) is a customizable version of the MACD indicator, allowing traders to choose different moving average types and parameters for increased flexibility. 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 GetTimeSeriesMacdExt: 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.
GetTimeSeriesMacdExt 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 GetTimeSeriesMacdExt 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 GetTimeSeriesMacdExt. 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.
GetTimeSeriesMacdExt 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.