tracer-bullets

Build features as vertical slices through all layers, verifying each slice before starting the next. From The Pragmatic Programmer: get feedback as quickly as possible. Don't build horizontal layers in isolation (all endpoints, then all UI, then all tests). Build one thin vertical path, verify it works, then expand.

Skip for single-layer changes, one-file bug fixes, or work already decomposed into ordered vertical slices by a task tracker.

| Vertical over horizontal | Build one slice through all layers, not one layer across all features | | Verify before advancing | Tests pass, page renders, round-trip works before next slice | | One slice per session | Each slice should be completable in a single agent session |

将多层特征构建为垂直端到端切片而不是水平层。每个切片在下一个切片开始之前都会经过验证。 使用时机：启动任何跨越 2+ 层（DB、API、UI、测试）的任务、构建 CRUD 功能、实施多步骤流程、将功能分解为子任务或规划实施顺序。 来源：oakoss/agent-skills。