According to Satya Nadella, GitHub Copilot has introduced 'Agent Mode' which enhances its capabilities with an Autonomous Software Engineering (SWE) agent, potentially impacting software development practices and productivity. This new mode may influence trading strategies for tech companies involved in AI-driven development tools, as it suggests a shift towards more automated coding solutions. Investors may consider the growth potential in AI and software development sectors as GitHub's advancements could lead to increased adoption and integration in tech ecosystems.