State of Context Engineering in 2026

Context Engineering has gone from a niche concern to the core discipline of AI Engineering in under a year. In mid-2025, two posts laid much of the groundwork. Manus shared lessons from rebuilding their agent framework four times (July 2025). Anthropic followed with their guide on effective context engineering for agents (September 2025). That was eight months ago. The patterns they described have since matured and were adopted across platforms. Why Context Engineering Matters Than Model Capability The core insight is simple. LLMs have a finite attention budget.