Plan Then Code

Anthropic's explore-plan-code-commit workflow for AI-assisted development: clarify requirements before coding, write a plan for non-trivial changes, iterate in small verified steps, and treat context as a finite resource. Use when starting any non-trivial implementation task, when requirements are ambiguous, or when the user says 計画して, いきなり書かないで, 手順を決めて, 要件を整理して. Skip planning only when the entire diff can be described in one sentence. Not for the red-green-refactor cycle itself (use test-driven-development) or for orchestrating a multi-step business engagement as project leader (use agent-team; this skill applies to the individual implementation task within it).