The Minimum Index (MININDEX) returns the index of the lowest value in a data series over a specified period, providing information about the timing of extreme price movements.
AI agents call GetTimeSeriesMinIndex 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.
GetTimeSeriesMinIndex is a read-only analytical tool that computes a statistic (minimum index) from historical time series data. It retrieves and analyzes information without side effects. While the Twelve Data server provides financial market data, this specific tool does not execute trades, move money, or create/modify any data — it only performs a computational lookup on existing time series.
From the tool's definition Tool description states it 'returns the index of the lowest value in a data series over a specified period' — a pure data retrieval and analysis operation with no modification, deletion, or execution of external operations.
Documented attack patterns abuse exactly the kind of access GetTimeSeriesMinIndex 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 GetTimeSeriesMinIndex:
{
"version": "1",
"default": "deny",
"tools": {
"GetTimeSeriesMinIndex": {}
}
}GetTimeSeriesMinIndex 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 Index (MININDEX) returns the index of the lowest value 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 GetTimeSeriesMinIndex: 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.
GetTimeSeriesMinIndex 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 GetTimeSeriesMinIndex 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 GetTimeSeriesMinIndex. 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.
GetTimeSeriesMinIndex 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.