Sion WuPersonal site and writing by Sion Wu.https://sionwu.com/Understanding Large Models, Tools, and Agents from First Principles: A Unified Account of Contexthttps://sionwu.com/posts/context-first-principles-llm-tools-agents/https://sionwu.com/posts/context-first-principles-llm-tools-agents/A context-first account of how large models, tool calling, memory systems, and agents work—and why the real engineering competition centers on context governance.Fri, 28 Aug 2026 14:40:00 GMTai-engineeringreading-learning