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Evaluate acquisition channels by unit economics, customer quality, and scalability to decide whether to scale, test, or kill. \n \n Assesses three core dimensions: unit economics (CAC, LTV, payback period, LTV:CAC ratio), customer quality (retention, churn, NRR by channel), and scalability (magic number, addressable volume, CAC trends) \n Delivers one of four recommendations: scale aggressively (LTV:CAC >3:1, payback <12mo), test and optimize (marginal economics with fixable problems), kill

Survey design framework grounded in product research best practices from nine leaders. \n \n Prioritize CSAT over NPS for better statistical properties and business outcome correlation; use 5-7 item scales \n Design single-variable questions only; avoid double-barreled phrasing that conflates multiple concepts \n Target customers 3-6 months post-signup when memory of the \"before\" state is fresh and relevant \n Use MaxDiff (Most/Least) methodology for feature prioritization rather than unlimite

You are an expert full-stack web developer focused on producing clear, readable Next.js code. You always use the latest stable versions of Next.js 14, Supabase, TailwindCSS, and TypeScript, and you are familiar with the latest features and best practices. You carefully provide accurate, factual, thoughtful answers, and are a genius at reasoning.

Modern SwiftUI patterns for iOS 26+ with MV architecture, state management, and view composition. \n \n Covers @Observable ownership rules, @State / @Bindable / @Environment wiring, and view decomposition best practices for clean, performant UIs \n Includes async data loading with .task , custom ViewModifier styling, environment value patterns, and granular state tracking that only re-renders affected views \n Provides iOS 26+ API updates (scroll edge effects, background extensions, @Animatable

Bridge design and engineering teams by clarifying roles, organizational placement, and hiring strategy. \n \n Defines design engineering as merging UX design with engineering to accelerate prototyping and production shipping, with scope varying from validation prototypes to production-ready code \n Emphasizes combining design sensibility with shipping ability rather than seeking unicorn-level expertise in both disciplines \n Guides organizational placement decisions, handoff friction diagnosis,

Team culture frameworks drawn from 138 product leaders at startups through Google and Airbnb. \n \n Focuses on articulating existing culture rather than inventing new values; helps identify behaviors in high performers and document what already works \n Emphasizes culture as a decentralized decision-making tool for remote and distributed teams, enabling sound choices when leadership isn't present \n Covers psychological safety, trust-building, and feedback loops as foundations for organizational

Structural design patterns and principles for reliable multi-step Claude Code workflow skills. \n \n Covers five workflow patterns (routing, sequential pipeline, linear progression, safety gate, task-driven) with numbered phases, entry/exit criteria, and decision trees for pattern selection \n Enforces progressive disclosure: SKILL.md stays under 500 lines with details split into references/ and workflows/ directories, one level deep \n Provides 20 anti-patterns with before/after fixes, covering

Practical guidance for building effective AI applications using techniques from 60 product leaders and practitioners. \n \n Covers core prompting patterns: few-shot examples, decomposition for complex tasks, self-criticism, and context placement for cache efficiency \n Emphasizes architecture decisions over prompt tuning: context engineering, RAG data preparation, layered model supervision, and specialized models for specific tasks \n Provides evaluation frameworks: mandatory evals with binary P

Audit UI code against Web Interface Guidelines for compliance and best practices. \n \n Fetches the latest guidelines from Vercel Labs before each review to ensure current rule compliance \n Accepts file paths or patterns as arguments; prompts for files if none specified \n Outputs findings in concise file:line format for quick identification of violations \n Covers accessibility, design patterns, and UX best practices as defined in the guidelines repository \n

Next.js 16+ uses Turbopack by default for local development: an incremental bundler written in Rust that significantly speeds up dev startup and hot updates.