Use for test lifecycle hooks: beforeAll, afterAll, beforeEach, afterEach, fixtures, preload.

Use for mock functions in Bun tests, spyOn, mock.module, implementations, and test doubles.

Configure Bun's built-in test runner with Jest-compatible APIs. Use when setting up testing infrastructure, writing unit/integration/snapshot tests, migrating from Jest, or configuring test coverage. 3-10x faster than Jest.

Use when writing tests with Bun's built-in test runner. Covers test organization, assertions, mocking, and snapshot testing using Bun's fast test infrastructure.

Configures Bun as an all-in-one JavaScript runtime, bundler, package manager, and test runner with native TypeScript support. Use when building fast applications, bundling for production, or replacing Node.js tooling.

Analyze and optimize JavaScript bundle size, identify large dependencies, and improve load times. Use when bundles are large, investigating performance issues, or optimizing frontend assets.

Analyzes JavaScript bundle sizes, identifies optimization opportunities, and helps reduce bundle size for faster page loads.

Import directly from source files instead of barrel files. Apply when using libraries like lucide-react, @mui/material, or @radix-ui/react-* to reduce bundle size and improve dev boot time.

Bundle size reduction strategies, icon optimization, tree-shaking, and performance analysis. Use when reducing bundle size or optimizing imports.

You are an expert in optimizing JavaScript bundle sizes and build performance

Monitor JavaScript bundle size and execution performance. Use when tracking bundle size, identifying large chunks, or optimizing load performance.

Reduce JavaScript and CSS bundle sizes through code splitting, tree shaking, and optimization techniques. Improve load times and overall application performance.

Reduce bundle size with splitting and compression.

How to write idiomatic assertions with the Bupkis assertion library for TypeScript and JavaScript

Expert on ISA system bus for ES-1841. Provides guidance on bus timing, I/O port addressing, memory mapping, bus signals, and expansion card interface.

Expert in bridging the gap between business needs and technical solutions. Specializes in Requirements Engineering, BPMN, and Agile User Stories. Use when gathering requirements, creating user stories, modeling business processes, or translating business needs to technical specs.

Business process analysis, requirements documentation, and workflow optimization for retail, supply chain, and technology organizations

Extract contact information from business card images using OCR - name, company, email, phone, address.

Perform comprehensive competitor analysis for any business. Produces an executive-summary markdown report with target customer profile, market positioning, pricing/business model, product features, funding/company size, SWOT analysis, and competitive matrix. All findings are data-grounded. Use when the user asks to analyze competitors, understand competitive landscape, compare a business to alternatives, or perform market research.

This skill should be used when the user requests to create professional business documents (proposals, business plans, or budgets) from templates. It provides PDF templates and a Python script for generating filled documents from user data.

Master business documentation including BRD, FRD, specifications, and technical documentation for clear communication and requirements management.

business-english-game

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Especialista en Business Forge: gestión de assets post-magia, Fusion Engine y generación de visuales.

Systematically validate business ideas with proven scoring frameworks. Produces comprehensive 2,000-3,000 word validation report with actionable recommendations and go/no-go decision.

Expert in Japanese business communication covering keigo, email etiquette, meeting protocols, and corporate culture nuances

Implement business logic with ActiveInteraction and AASM state machines. Routes to specialized skills for typed operations and state management.

Create and refactor Python dataclass business models and mappers following clean architecture patterns with proper separation of concerns.

Business model design using Alexander Osterwalder's 9 building blocks. Use when: business model, canvas, value proposition, customer segments, revenue streams, startup planning, analyze business, business strategy.

Complete Business Model Canvas design with all 9 blocks analyzed. Transforms validated ideas into viable business models with revenue clarity and operational strategy.

business-model-preferences

Expert business planning consultant for creating comprehensive, investor-ready business plans from scratch or refining existing plans. Use when users request help creating a new business plan, updating/reviewing an existing business plan, need guidance on specific business plan sections, or require financial projection assistance. Applies to startups and established businesses across all industries seeking funding or strategic planning.

Transform any boring B2B business problem into a complete software blueprint with architecture, database schema, feature breakdown, and step-by-step implementation plan formatted as a CLAUDE.md file ready for development.

Create comprehensive business context profiles through guided interview. Use when the user wants to build or update their business profile, needs help defining their offerings, positioning, or brand identity.

Business rules elicitation and analysis techniques. Covers rule types (constraints, derivations, inferences), decision tables, rule templates, and policy documentation. Use when identifying business policies, constraints, calculations, and decision logic during requirements elicitation.

Business strategy expert - defines users, value propositions, use cases, and business requirements. Connects technical development with market realities and ROI. Includes LATAM market (Chile) specialization.

Standardize button component heights, padding, and transitions across all variants. Ensures consistent appearance for default, outline, secondary, ghost, and link variants. Updates button.tsx with unified styles.

Create persona × journey grids for AEO (Answer Engine Optimization) content strategy. Maps specific questions to buyer stages for AI citation optimization.

Create detailed buyer personas and Ideal Customer Profiles (ICP) for B2B and B2C marketing. Generates comprehensive profiles with demographics, psychographics, pain points, goals, objections, and messaging strategies. Use when defining target audience, creating ICP, or developing customer profiles.

Beads Viewer - graph-aware triage engine for Beads issue tracker with 9 graph metrics (PageRank, betweenness, HITS, etc.), dependency-aware planning, and purpose-built robot protocol for AI agents.

Save session state (continue working or exit safely)

Advanced memory and knowledge management workflows for Byterover MCP Server. Use when creating implementation reports with timelines, documenting features as PRDs, or syncing project documentation folders with automatic conflict resolution. Extends basic retrieve/store operations with structured workflows for documentation, analysis, and knowledge synthesis.

Manages project knowledge using ByteRover context tree. Provides two operations: query (retrieve knowledge) and curate (store knowledge). Invoke when user requests information lookup, pattern discovery, or knowledge persistence.

Use when implementing data structures in C including arrays, linked lists, trees, and hash tables with manual memory management.

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Convert C/C++ project build.sh and test.sh scripts to support incremental builds. Use when fixing build scripts for re-execution after docker commit, converting to out-of-tree builds, or making scripts idempotent for repeated execution.

Use when managing memory in C programs with malloc/free, pointers, and avoiding common memory safety pitfalls.

Write efficient C code with proper memory management, pointer

Use when bootstrapping C3 documentation for any project - guides through Socratic discovery and delegates to layer skills for document creation