The Minimum and Maximum (MINMAX) indicator calculates the lowest and highest values of a data series over a specified period, often used to identify potential support and resistance levels or extreme price movements.
AI agents call GetTimeSeriesMinMax 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.
GetTimeSeriesMinMax is a technical indicator calculation that queries historical financial data and returns analytical results (minimum/maximum values). It has no side effects, does not modify data, does not execute trades or financial transactions, and does not trigger external operations. It is a straightforward Read operation returning pre-computed market statistics.
From the tool's definition Tool calculates and retrieves 'lowest and highest values of a data series over a specified period' — a pure data analysis function that returns computed statistics without modifying any underlying data or triggering external actions.
Documented attack patterns abuse exactly the kind of access GetTimeSeriesMinMax 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 GetTimeSeriesMinMax:
{
"version": "1",
"default": "deny",
"tools": {
"GetTimeSeriesMinMax": {}
}
}GetTimeSeriesMinMax 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 (MINMAX) indicator calculates the lowest and highest values of a data series over a specified period, often used to identify potential support and resistance levels or 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 GetTimeSeriesMinMax: 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.
GetTimeSeriesMinMax 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 GetTimeSeriesMinMax 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 GetTimeSeriesMinMax. 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.
GetTimeSeriesMinMax 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.