The Average Price (AVGPRICE) indicator computes the average of a security
AI agents call GetTimeSeriesAvgPrice 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.
This tool retrieves and calculates financial market data (average price indicator) without creating, modifying, executing external operations, or deleting anything. It is a pure read operation that queries existing market data and returns a computed metric. The low severity reflects that misuse would only result in incorrect financial analysis, not actual financial transactions or data loss.
From the tool's definition Tool description states it 'computes the average of a security' - a data retrieval and calculation operation with no modification of underlying data. The Twelve Data API context indicates this is a financial data query service.
Documented attack patterns abuse exactly the kind of access GetTimeSeriesAvgPrice 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 GetTimeSeriesAvgPrice:
{
"version": "1",
"default": "deny",
"tools": {
"GetTimeSeriesAvgPrice": {}
}
}GetTimeSeriesAvgPrice 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 Price (AVGPRICE) indicator computes the average of a security. 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 GetTimeSeriesAvgPrice: 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.
GetTimeSeriesAvgPrice 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 GetTimeSeriesAvgPrice 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 GetTimeSeriesAvgPrice. 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.
GetTimeSeriesAvgPrice 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.