The Keltner Channel (KELTNER) is a volatility-based indicator that uses a combination of EMA and the ATR to create a channel around a security
AI agents call GetTimeSeriesKeltner 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 is a data retrieval tool that computes and returns a volatility-based technical indicator. It queries existing market data and performs calculations to generate analysis metrics, with no side effects. The 'GetTimeSeriesKeltner' naming pattern and context within a financial data API server (alongside similar analysis tools like GetAnalystRatings, GetCashFlow) confirms it is read-only.
From the tool's definition Tool retrieves technical analysis indicator data (Keltner Channel) based on time series data. The description indicates it 'uses a combination of EMA and the ATR to create a channel' — a calculated metric derived from historical data.
Documented attack patterns abuse exactly the kind of access GetTimeSeriesKeltner 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 GetTimeSeriesKeltner:
{
"version": "1",
"default": "deny",
"tools": {
"GetTimeSeriesKeltner": {}
}
}GetTimeSeriesKeltner is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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The Keltner Channel (KELTNER) is a volatility-based indicator that uses a combination of EMA and the ATR to create a channel around 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 GetTimeSeriesKeltner: 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.
GetTimeSeriesKeltner 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 GetTimeSeriesKeltner 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 GetTimeSeriesKeltner. 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.
GetTimeSeriesKeltner 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.