langsmith

Prompt engineering was the primitive of 2023, context engineering owned 2024–2025, and 2026 is settling on a new one: loop engineering — the discipline of designing the feedback loops that surround an agent, not just the agent itself. Sydney Runkle (PM on LangChain’s open-source team) makes the case in this webinar that the durable advantage is never the agent, it’s the loops built around it. Why loops, not agents Runkle opens with a simple framing: a model has some fixed level of intelligence; a harness wrapped around it converts that intelligence into useful work on a specific problem....

Weekly Video Notes — a short article distilling one talk from the weekly digest. Source video and key frames are embedded throughout. LangChain’s annual conference Interrupt 2026 opened with co-founder Harrison Chase laying out a thesis the company has been quietly building toward for two years: agents aren’t software, and you can’t ship them with a software lifecycle. What follows are the key ideas from the keynote, plus the half-dozen product launches LangChain announced to back the thesis....