The state of harness engineering

Models are getting better fast. But when an agent fails in production, the model often isn’t the problem these days. Instead, problems increasingly start and stop with the agent harness. The failure might be in the context it received, the tool it called, the path it took through a workflow, the state it carried forward, or the recovery logic that kicked in when something went wrong. Together, those systems make up the agent harness, and they increasingly determine whether an agent actually works. Join Arize and Google DeepMind in London for a practical evening on how to find and fix failures across the systems surrounding the model. We’ll look at where agent harnesses break in production, how teams use traces and evals to understand what went wrong, and the patterns developers are using to make agents more reliable as models become more capable. You’ll hear perspectives from Arize, Google DeepMind, and another team building agents in production, followed by drinks, food, and time to compare notes with fellow AI builders. Who this is forAI engineers, agent builders, technical leads, and PMs building LLM-based products, especially anyone working on tools, context, evals, tracing, orchestration, or agent reliability. What you'll leave with A practical model for thinking about the systems that make up an agent harness A clearer picture of where agents fail beyond the model itself Techniques for using traces and evals to find the source of failures Patterns for debugging and improving tools, context, workflows, and recovery logic Perspectives from Google DeepMind and teams shipping agents in production New connections with fellow AI builders in London FormatThree talks plus networking, approximately 2.5 hours. LevelBeginner to advanced. No specific platform experience required.Agenda (TBC) 6:00 - 6:30 PM | Opening: Check-in, welcome drinks & snacks, opening remarks 6:30 - 7:00 PM | Session 1: Google DeepMind (Talk title TBC) 7:00 - 7:30 PM | Session 2: Everything that breaks around the model: How to diagnose and improve the agent harness - Dat Ngo, Arize AI 7:30 - 7:45 PM | Break 7:45 - 8:15 PM | Session 3: Third partner/Panel (TBC) 8:15 - 9:00 PM | Networking & catering