MCP server validation must test actual API tool calls, not just health endpoints.
MCP server validation must test actual API tool calls, not just health endpoints. Health endpoints (/health, /healthz, /ready) do not exercise the API client code path. Pybreaker bug was missed because validation only tested health. Rule: Always test at least 2-3 real API tools (e.g., get_account_info, list_groups) via MCP protocol calls during build/validate step. Health checks only prove the container runs, not that tools work.