Last week saw the release of several influential guides and updates in the artificial intelligence sector from major industry players including McKinsey, OpenAI, and Google. McKinsey published insights on how AI agents are transforming business operations. OpenAI released two key documents: one focused on scaling AI use cases and another providing a practical guide to building AI agents, covering architecture, tools, and safety considerations. Google contributed a comprehensive 68-page prompt engineering guide aimed at API users. Additionally, notable AI research papers from April 14 to 20 included works on GUI-R1, AgentA/B, DocAgent, SocioVerse, and advancements in large language model (LLM) reasoning and diffusion LLMs via reinforcement learning. OpenAI also introduced new model versions such as GPT-4.1 in full, mini, and nano formats, along with tools like Codex CLI, and smaller models like o3 and o4-mini. Amazon announced the launch of AI agents capable of autonomous actions rather than mere conversational abilities. Stability AI released updates enhancing 3D video and audio capabilities. Furthermore, the PENSIEVE system was highlighted for its life-saving applications through tablet technology. These developments collectively underscore a week of significant progress and resource availability in AI research, deployment, and practical applications.