The Coppock Curve is a momentum oscillator that measures the rate of change in a security
AI agents call GetTimeSeriesCoppock 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 financial market data (technical indicator values) without modifying any underlying data, executing code, deleting records, or moving money. It is purely informational—retrieving time series data and calculating the Coppock Curve indicator. The blast radius of misuse is negligible; an AI agent cannot cause harm by querying this indicator repeatedly or on unintended symbols.
From the tool's definition Tool name 'GetTimeSeriesCoppock' indicates data retrieval ('Get'). Description states it 'measures the rate of change in a security' - a technical analysis metric calculation/reading operation.
Documented attack patterns abuse exactly the kind of access GetTimeSeriesCoppock 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 GetTimeSeriesCoppock:
{
"version": "1",
"default": "deny",
"tools": {
"GetTimeSeriesCoppock": {}
}
}GetTimeSeriesCoppock is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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The Coppock Curve is a momentum oscillator that measures the rate of change in 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 GetTimeSeriesCoppock: 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.
GetTimeSeriesCoppock 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 GetTimeSeriesCoppock 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 GetTimeSeriesCoppock. 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.
GetTimeSeriesCoppock 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.