get_ht_trendline
AI agents call get_ht_trendline to retrieve information from AlphaVantage MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
HT_TRENDLINE is a technical analysis indicator (Hilbert Transform Trendline) used in financial analysis. The tool name suggests it retrieves pre-calculated indicator data from AlphaVantage's API. No description is provided, which lowers confidence slightly, but the pattern is consistent with other Read operations on this server that fetch market data and technical indicators.
From the tool's definition Tool name 'get_ht_trendline' follows the naming pattern of sibling tools (get_ad, get_adosc, get_adx, etc.) which are all technical indicator retrieval functions.
Attacks that exploit this kind of access
get_ht_trendline. It is categorised as a Read tool in the AlphaVantage MCP Server MCP Server, which means it retrieves data without modifying state.
Register the AlphaVantage MCP Server MCP server in PolicyLayer and add a rule for get_ht_trendline: 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 AlphaVantage MCP Server. Nothing to install.
get_ht_trendline 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 get_ht_trendline 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 get_ht_trendline. 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.
get_ht_trendline is provided by the AlphaVantage MCP Server MCP server (lifejwang11/alphavantage-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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