The Relative Volume (RVOL) is a ratio that compares a security
AI agents call GetTimeSeriesRvol 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 historical financial market data (Relative Volume metric) from the Twelve Data API. It has no side effects, does not execute trades, does not modify data, and does not execute code. It is a pure data retrieval operation fitting the 'Read' category. Severity is low because misuse would only result in unauthorized data access, not financial transactions, data destruction, or code execution.
From the tool's definition Tool name 'GetTimeSeriesRvol' and description indicate retrieval of Relative Volume data, a financial metric.
Documented attack patterns abuse exactly the kind of access GetTimeSeriesRvol 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 GetTimeSeriesRvol:
{
"version": "1",
"default": "deny",
"tools": {
"GetTimeSeriesRvol": {}
}
}GetTimeSeriesRvol is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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The Relative Volume (RVOL) is a ratio that compares 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 GetTimeSeriesRvol: 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.
GetTimeSeriesRvol 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 GetTimeSeriesRvol 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 GetTimeSeriesRvol. 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.
GetTimeSeriesRvol 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.