The Rate of Change Ratio (ROCR) indicator measures the ratio of a security
AI agents call GetTimeSeriesRocr 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 pre-calculated or computed technical indicator data (Rate of Change Ratio) for securities. It performs no mutations, deletions, or side effects - it only queries and returns financial data. No code execution, financial transactions, or irreversible operations are involved. This is a straightforward Read operation with minimal risk if misused, as it only returns market analysis metrics.
From the tool's definition Tool name 'GetTimeSeriesRocr' indicates a GET operation retrieving time series data. Description states it 'measures the ratio of a security' - a technical analysis indicator calculation.
Documented attack patterns abuse exactly the kind of access GetTimeSeriesRocr 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 GetTimeSeriesRocr:
{
"version": "1",
"default": "deny",
"tools": {
"GetTimeSeriesRocr": {}
}
}GetTimeSeriesRocr is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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The Rate of Change Ratio (ROCR) indicator measures the ratio 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 GetTimeSeriesRocr: 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.
GetTimeSeriesRocr 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 GetTimeSeriesRocr 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 GetTimeSeriesRocr. 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.
GetTimeSeriesRocr 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.