Agent is Model plus Harness: Getting to Know Nexo

Nexo shipped this week. The announcement covers what it is in one sitting: a harness for Ruby AI agents, composed on top of the RubyLLM ecosystem instead of reinventing it, with two real additions, a sandbox and permissions seam, and a workflow lifecycle for jobs you need to watch, resume, or schedule rather than just chat with. What that post does not cover is what building with it actually feels…