Visual + UX design defaults for new UIs. Material Design 3, dark/light theme, modern type, Behance-grade polish, i18n (en, pt-BR, es), context-aware favicon. No emojis and no em-dashes; use MD3/modern icons instead. Apply when building something new. Project conventions in .claude/conventions/web.md override these defaults.
Re-install / upgrade harness-kit in the current project to the version bundled in the installed plugin. Run after /plugin update harness-kit fetches a newer plugin version.
Generate a Product Requirements Prompt for engineering handoff. Needs an approved PRD. Sensors, link validation, and eval gates.
Install the harness-kit pipeline into the current project. Copies agents, slash commands, skills, hooks, and the status bar into the project's .claude/, plus AGENTS.md and CLAUDE.md at the repo root. Run after adding the harness-kit plugin from the marketplace.
Design any system from scratch into a rigorous System Design Doc. Generic fallback when no topic-specific playbook fits. Sensors and evals gate.
Design a distributed rate limiter at scale, policy model, enforcement layers (edge/gateway/service), algorithms (token bucket, sliding window), hot keys, fail-open vs fail-closed, multi-region, shadow mode. Topic playbook from the System Design series EP (Rate Limit
Adversarial design review of a System Design Doc. Interrogates the staff questions, finds the cost-explosion and failure risks, returns a verdict. Sensors and evals gate.
Design a web-scale search engine (crawler, processing, indexing, query serving). Topic playbook from the System Design series EP24. Use when the system is a search engine, web crawler, or large-scale retrieval system. Sensors and evals gate.