simple-mcp-server

The server correctly loads the API key from environment variables (EXCHANGERATE_API_KEY), preventing hardcoding. It relies on `requests` for external API calls, which is standard and secure. Input parameters for currency conversion are directly used in the API URL, which is typical for such services and not an immediate vulnerability given the context of currency codes. No `eval` or direct `subprocess` calls are found within the server logic itself. The `test_server.py` uses `subprocess` for testing, but that is not part of the deployed server. Error messages returned to the client are informative but do not expose critical internal system details beyond API error types.