NexusMCP is an audited, production-grade Model Context Protocol (MCP) gateway for Cursor, Windsurf, Claude Desktop, and autonomous AI agents. Features •AST Code Sandbox (prevents system escapes & subprocess calls) •Safe SQL Engine (circuit-breaker against destructive DROP/DELETE queries) • Semantic Cost Router (cuts token costs up to 70% by routing routine tasks to DeepSeek V4.1-Flash) • Zero build tools: pure Python standard library + Docker Free open-core on GitHub. Pro suite ($29) on Gumroad