The Money Flow Index (MFI) is a volume-weighted momentum oscillator that measures buying and selling pressure by comparing positive and negative money flow, helping traders identify overbought or oversold conditions.
AI agents call GetTimeSeriesMfi 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 financial indicator data (Money Flow Index) from the Twelve Data API. It performs a read-only query with no side effects—it does not execute trades, modify data, delete information, or trigger external operations. Even in misuse scenarios, an AI agent could only obtain financial market data analysis, which poses minimal risk.
From the tool's definition Tool name 'GetTimeSeriesMfi' and description indicate retrieval of Money Flow Index data—a technical analysis indicator.
Documented attack patterns abuse exactly the kind of access GetTimeSeriesMfi 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 GetTimeSeriesMfi:
{
"version": "1",
"default": "deny",
"tools": {
"GetTimeSeriesMfi": {}
}
}GetTimeSeriesMfi is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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The Money Flow Index (MFI) is a volume-weighted momentum oscillator that measures buying and selling pressure by comparing positive and negative money flow, helping traders identify overbought or oversold conditions. 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 GetTimeSeriesMfi: 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.
GetTimeSeriesMfi 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 GetTimeSeriesMfi 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 GetTimeSeriesMfi. 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.
GetTimeSeriesMfi 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.