The On Balance Volume (OBV) indicator is a cumulative volume-based tool used to measure buying and selling pressure, helping traders identify potential price trends and reversals.
AI agents call GetTimeSeriesObv 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 or computes the On Balance Volume indicator from historical time series data. It performs a read-only calculation on financial market data to generate an analytical indicator for traders. There is no creation, modification, deletion, code execution, or financial transaction involved. The tool is informational and non-destructive, making it a Read category risk with low severity.
From the tool's definition Tool name 'GetTimeSeriesObv' contains 'Get', indicating data retrieval. Description describes it as 'a cumulative volume-based tool used to measure buying and selling pressure' and 'identify potential price trends' — purely analytical metric computation over…
Documented attack patterns abuse exactly the kind of access GetTimeSeriesObv 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 GetTimeSeriesObv:
{
"version": "1",
"default": "deny",
"tools": {
"GetTimeSeriesObv": {}
}
}GetTimeSeriesObv is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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The On Balance Volume (OBV) indicator is a cumulative volume-based tool used to measure buying and selling pressure, helping traders identify potential price trends and reversals. 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 GetTimeSeriesObv: 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.
GetTimeSeriesObv 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 GetTimeSeriesObv 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 GetTimeSeriesObv. 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.
GetTimeSeriesObv 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.