The Plus Directional Movement (PLUS_DM) is a component of the ADX indicator, measuring the extent of a security
AI agents call GetTimeSeriesPlusDM 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 calculates technical indicator values (PLUS_DM/ADX component) from time series data. It has no side effects, does not modify data, execute code conditionally, delete anything, or involve financial transactions. It is a pure data retrieval and analysis function typical of financial data APIs.
From the tool's definition Tool name 'GetTimeSeriesPlusDM' uses the 'Get' prefix indicating data retrieval. Description states it measures 'the extent of a security' as part of technical analysis (ADX indicator component), which is a read-only calculation on historical market data.
Documented attack patterns abuse exactly the kind of access GetTimeSeriesPlusDM 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 GetTimeSeriesPlusDM:
{
"version": "1",
"default": "deny",
"tools": {
"GetTimeSeriesPlusDM": {}
}
}GetTimeSeriesPlusDM is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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The Plus Directional Movement (PLUS_DM) is a component of the ADX indicator, measuring the extent 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 GetTimeSeriesPlusDM: 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.
GetTimeSeriesPlusDM 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 GetTimeSeriesPlusDM 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 GetTimeSeriesPlusDM. 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.
GetTimeSeriesPlusDM 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.