The Parabolic SAR Extended (SAREXT) is a customizable version of the Parabolic SAR indicator, allowing traders to choose different parameters for increased flexibility in identifying potential entry and exit points.
AI agents call GetTimeSeriesSarExt 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.
GetTimeSeriesSarExt is a technical analysis calculation tool that returns computed indicator values based on historical price data and user-selected parameters. It retrieves and returns data without side effects, aligning with the 'Read' category. The severity is low because misuse would only result in incorrect analysis or trading decisions based on bad parameters, not actual system or data damage.
From the tool's definition Tool retrieves financial market data (Parabolic SAR indicator values) from the Twelve Data API. The description indicates it 'allows traders to choose different parameters' for analysis, which is a read-only, parameterized query operation.
Documented attack patterns abuse exactly the kind of access GetTimeSeriesSarExt 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 GetTimeSeriesSarExt:
{
"version": "1",
"default": "deny",
"tools": {
"GetTimeSeriesSarExt": {}
}
}GetTimeSeriesSarExt is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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The Parabolic SAR Extended (SAREXT) is a customizable version of the Parabolic SAR indicator, allowing traders to choose different parameters for increased flexibility in identifying potential entry and exit points. 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 GetTimeSeriesSarExt: 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.
GetTimeSeriesSarExt 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 GetTimeSeriesSarExt 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 GetTimeSeriesSarExt. 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.
GetTimeSeriesSarExt 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.