Agentic Engineering: The Complete Guide to Post-Vibe-Coding Development

What Changed in February 2026

Andrej Karpathy declared vibe coding has evolved into "agentic engineering." AI agents now write code directly 99% of the time while you supervise.

The New Developer Workflow

1. Set goals — Define what the feature should do, not how
2. Launch agents — Multiple AI agents work in parallel on different aspects
3. Review outputs — Check agent work, approve or redirect
4. Guide strategy — Make architectural and product decisions

Tools for Agentic Engineering

• Claude Code: Terminal-based agent with full filesystem access, now with Opus 4.6 fast mode
• OpenAI Codex App: Multi-agent command center for macOS
• Cursor CLI: Plan mode + Cloud Agent for cross-device workflows
• GitHub Copilot: Multiple agents (Explore, Task, Plan, Code-review) running in parallel
• Xcode 26.3: Apple's native agent support via MCP

Key Principles

• Use Plan mode before coding — let the agent design the approach first
• Run multiple agents in parallel on independent tasks
• Pick the right model per task: Opus for planning, Codex for speed, Gemini for iterations
• Always review diffs and run tests before accepting changes