The Minimum and Maximum Index (MINMAXINDEX) returns the indices of the lowest and highest values in a data series over a specified period, providing information about the timing of extreme price movements.
AI agents call GetTimeSeriesMinMaxIndex 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.
GetTimeSeriesMinMaxIndex performs analytical queries on financial time series data to identify extreme values. This is a read operation: it retrieves and processes existing data to produce analytical results (indices/timing information) without side effects, data modification, or irreversible actions.
From the tool's definition Tool returns indices of lowest and highest values in a data series - a read-only operation that retrieves and analyzes historical financial data without modification, deletion, or execution of external operations.
Documented attack patterns abuse exactly the kind of access GetTimeSeriesMinMaxIndex 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 GetTimeSeriesMinMaxIndex:
{
"version": "1",
"default": "deny",
"tools": {
"GetTimeSeriesMinMaxIndex": {}
}
}GetTimeSeriesMinMaxIndex is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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The Minimum and Maximum Index (MINMAXINDEX) returns the indices of the lowest and highest values in a data series over a specified period, providing information about the timing of extreme price movements. 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 GetTimeSeriesMinMaxIndex: 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.
GetTimeSeriesMinMaxIndex 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 GetTimeSeriesMinMaxIndex 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 GetTimeSeriesMinMaxIndex. 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.
GetTimeSeriesMinMaxIndex 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.