The Average (AVG) indicator calculates the arithmetic mean of a data series over a specified period, often used to smooth out data fluctuations.
AI agents call GetTimeSeriesAvg 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.
GetTimeSeriesAvg is a pure data retrieval and computation tool that reads financial market data and performs a mathematical calculation (averaging) on it. There are no side effects, no data modification, no code execution, and no financial obligations. This is a straightforward analytical query operation accessing the Twelve Data API for historical market information.
From the tool's definition Tool calculates and returns the arithmetic mean of a data series over a specified period. The description indicates it 'smooths out data fluctuations' and performs a statistical computation on existing time series data without modifying, deleting, executing…
Documented attack patterns abuse exactly the kind of access GetTimeSeriesAvg 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 GetTimeSeriesAvg:
{
"version": "1",
"default": "deny",
"tools": {
"GetTimeSeriesAvg": {}
}
}GetTimeSeriesAvg is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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The Average (AVG) indicator calculates the arithmetic mean of a data series over a specified period, often used to smooth out data fluctuations. 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 GetTimeSeriesAvg: 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.
GetTimeSeriesAvg 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 GetTimeSeriesAvg 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 GetTimeSeriesAvg. 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.
GetTimeSeriesAvg 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.