Claude Code Superpowers Plugin: TDD-Gated Workflow Hits 107K Stars — Brainstorm → Plan → Design Doc → Implement

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The Superpowers plugin for Claude Code enforces a structured development workflow: Brainstorming → Options/Tradeoffs Review → Plan Sketch → Design Doc → Implementation Plan → Implementation Steps. Every phase gates the next — no code is written until the plan is approved. The plugin provides composable skills for TDD, systematic debugging, subagent-driven development with built-in code review, and custom skill authoring. At 107K GitHub stars and 8,600 forks in five months, it was officially accepted into the Anthropic marketplace in January 2026. Builder.io calls it 'the structured workflow that actually works.'