Pattern: 'Agentic Engineering' Is Hardening Into a Discipline Distinct From Vibe Coding

Simon Willison·medium signal

The 2026 framing has settled into a bifurcation: vibe coding (intent-first, accept-without-reading) optimizes for speed with tools like Lovable, Bolt, v0, Replit Agent, and Cursor Composer; agentic engineering optimizes for correctness with Claude Code, Cursor Agent, Aider, and Cline under structured human oversight. The tell is process — spec-driven SOPs, TDD-for-agents, and review gates are migrating from blog theory into default tool workflows. For a solo builder, the leverage is picking the right mode per task rather than treating them as the same activity.