Zack Proser
AI Engineer on WorkOS’s Applied AI team, where he builds retrieval systems, agent harnesses, and evaluations. He also teaches applied AI and agent workflows through workshops, including at AI Engineer conferences.
Coding Agents Need Testable Definitions of Done
Nick Nisi and Zack Proser of WorkOS argue that engineers can delegate more work to coding agents only when they define completion in terms the agents must verify. Their workshop turns a failed test loop—an agent touched a file meant to prove tests had run, without running them—into a broader operating rule: use measurable goals, automated checks and human review to keep parallel and recurring work in bounds.
Human Attention Is Becoming the Bottleneck in AI Coding Workflows
Zack Proser, an Applied AI engineer at WorkOS, argues that AI coding has shifted the bottleneck from tool speed to human attention. His proposed workflow uses voice dispatch, isolated git worktrees, Slack and Linear-reading agents, remote phone control, and layered verification so developers can keep agent loops moving without staying pinned to a desk or rubber-stamping work they can no longer track.
Agent Skills Turn Repeated Instructions Into Portable Workflows
WorkOS engineers Nick Nisi and Zack Proser make the case that AI “skills” are a practical way to turn repeated agent instructions into portable, reusable workflows. They argue that small markdown-and-script packages can encode team context, constraints, evidence-gathering commands and output formats so agents stop producing generic answers and start following a team’s way of working. Their warning is that skills only help when they are focused, routed correctly, tested against a no-skill baseline and managed like shared software rather than treated as another giant context file.