The Agent Layer Is Hardening: OpenAI Sandboxes, Anthropic's Advisor Pattern, and the Protocol Wars Are Over
· 9 min read
April 16, 2026. The AI agent ecosystem just had one of its most consequential 72-hour windows of the year. OpenAI restructured how agents interact with compute. Anthropic published a new cost-efficiency architecture and shipped Claude Cowork to GA. Microsoft unified its fractured agentic SDKs. DeepSeek V4 is days away. And across developer communities, the backlash against unreliable agents is getting louder.
This is not hype. This is infrastructure. The agent layer is hardening.