The Maximum (MAX) indicator calculates the highest value of a data series over a specified period, often used to identify potential resistance levels or extreme price movements.
AI agents call GetTimeSeriesMax 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.
GetTimeSeriesMax is a technical analysis indicator that reads historical market data and computes a statistical metric (highest value). It retrieves information for analysis purposes only, with no side effects on data, accounts, positions, or external systems. No money moves, no data is modified or deleted, and no commands are executed—it is a straightforward Read operation typical of financial data APIs.
From the tool's definition Tool calculates and retrieves the maximum value from a financial data series over a specified period. Description indicates it 'calculates' and is used to 'identify' price patterns—purely analytical/informational functions with no data modification, deletion,…
Documented attack patterns abuse exactly the kind of access GetTimeSeriesMax 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 GetTimeSeriesMax:
{
"version": "1",
"default": "deny",
"tools": {
"GetTimeSeriesMax": {}
}
}GetTimeSeriesMax is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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The Maximum (MAX) indicator calculates the highest value of a data series over a specified period, often used to identify potential resistance levels or extreme price movements. 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 GetTimeSeriesMax: 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.
GetTimeSeriesMax 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 GetTimeSeriesMax 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 GetTimeSeriesMax. 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.
GetTimeSeriesMax 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.