The search results available for this weekly trading update do not contain specific news coverage about AI agents or agentic AI. While the provided sources discuss important developments in the broader AI technology sector during the week of December 22-30, 2025, they focus on different aspects of artificial intelligence markets.

The primary AI-related news from this period involves Nvidia's $20 billion deal to acquire assets from Grock, a company that designs high-performance AI accelerator chips. This transaction represents a significant development in the infrastructure supporting AI systems, but it concerns hardware and chip technology rather than AI agents or agentic systems specifically. The deal includes a non-exclusive licensing agreement covering Grock's inference technology, which helps make AI systems run faster and at lower costs. However, this is infrastructure-focused rather than focused on autonomous AI agents.

Another major AI stock story involves Oracle, which received significant investor attention due to its agreements with OpenAI but has faced challenges. However, the available search results do not describe Oracle's challenges in terms of AI agents or agentic systems, but rather in terms of scaling infrastructure and managing costs for AI services.

The search results reference the Santa Claus Rally market period from December 24 through January 5, 2025, which shows stock market activity during your requested week. The S&P 500 reached new all-time highs on Christmas Eve, and various technology stocks experienced movement during this period. However, these results do not provide specific information about how AI agent technologies or agentic systems affected trading or market performance.

To provide the accurate, comprehensive news digest focused on AI agents and agentic AI that you've requested, more targeted search results would be necessary. The current search results do not contain sufficient coverage of AI agent developments, agentic system announcements, or AI agent-related market activity from December 22-30, 2025.