get_ht_dcphase
AI agents call get_ht_dcphase 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.
AlphaVantage is a financial data API service. Technical indicators like HT_DCPHASE (Hilbert Transform - Dominant Cycle Phase) are computed values retrieved from market data. The tool appears designed to fetch pre-calculated indicator values, which is a read operation with no side effects.
From the tool's definition Tool name 'get_ht_dcphase' follows the naming pattern of sibling tools (get_ad, get_adosc, get_adx, etc.) which are all read-only technical indicator retrievers from the AlphaVantage API.
Attacks that exploit this kind of access
get_ht_dcphase. 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_dcphase: 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_dcphase 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_dcphase 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_dcphase. 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_dcphase 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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