get_cmo · AlphaVantage MCP Server MCP: Risk & Policy

WHAT IT DOES

What get_cmo does on AlphaVantage MCP Server

AI agents call get_cmo 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.

WHY IT NEEDS A POLICY

Why get_cmo needs a policy

CMO (Chande Momentum Oscillator) is a standard technical indicator. The 'get_' prefix and context of the server (providing access to stock market data and technical indicators) indicate this tool retrieves precomputed financial data without side effects. No modification, deletion, execution, or financial transaction capability is implied.

From the tool's definition Tool name 'get_cmo' with no description; naming convention matches sibling tools (get_ad, get_adx, get_apo, etc.) that retrieve technical indicators or financial data from AlphaVantage API

Attacks that exploit this kind of access

Questions about get_cmo

What does the get_cmo tool do? +

get_cmo. It is categorised as a Read tool in the AlphaVantage MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_cmo? +

Register the AlphaVantage MCP Server MCP server in PolicyLayer and add a rule for get_cmo: 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.

What risk level is get_cmo? +

get_cmo is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_cmo? +

Yes. Add a rate_limit block to the get_cmo 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.

How do I block get_cmo completely? +

Set action: deny in the PolicyLayer policy for get_cmo. 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.

What MCP server provides get_cmo? +

get_cmo 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.