The Addition (ADD) indicator performs a simple arithmetic addition of two input data series, typically used to combine multiple technical indicators or price data.
AI agents call GetTimeSeriesAdd 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.
GetTimeSeriesAdd is a technical indicator computation tool that takes input data series and returns a calculated result. It retrieves/processes data without side effects, does not modify underlying data, does not execute code or external operations, and does not commit financial transactions. This is a pure read operation that combines existing data for analytical purposes.
From the tool's definition Tool description states it 'performs a simple arithmetic addition of two input data series' - a mathematical operation on existing data with no modification, creation, deletion, or execution of external operations.
Documented attack patterns abuse exactly the kind of access GetTimeSeriesAdd 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 GetTimeSeriesAdd:
{
"version": "1",
"default": "deny",
"tools": {
"GetTimeSeriesAdd": {}
}
}GetTimeSeriesAdd is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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The Addition (ADD) indicator performs a simple arithmetic addition of two input data series, typically used to combine multiple technical indicators or price data. 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 GetTimeSeriesAdd: 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.
GetTimeSeriesAdd 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 GetTimeSeriesAdd 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 GetTimeSeriesAdd. 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.
GetTimeSeriesAdd 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.