Developer Uses AI Agent to Stress-Test Handoff Prompts Before Passing Them to Worker AIs

A developer building an app with Claude Code discovered a critical flaw in their multi-agent workflow, where one AI session writes instructions and separate AI sessions implement them in parallel. Before passing instructions to worker agents, they began routing prompts through a dedicated 'demolition' subagent tasked with finding weaknesses. The adversarial agent caught two significant issues: a test marked as a completion condition that passed even when the underlying feature failed, and a referenced config flag that was never actually connected to any code. Both flaws had been written with full confidence by the developer, who had not re-read the relevant code before drafting the instructions. The experience highlights that handoff prompts function as specifications, and a quick adversarial review against the actual codebase can prevent costly implementation errors downstream.