Languages & Frameworks for Claude Code

Test-driven development with red-green-refactor loop. Use when user wants to build features or fix bugs using TDD, mentions "red-green-refactor", wants integration tests, or asks for test-first development.

Three.js performance optimization and best practices guidelines. Use when writing, reviewing, or optimizing Three.js code. Triggers on tasks involving 3D scenes, WebGL/WebGPU rendering, geometries, materials, textures, lighting, shaders, or TSL.

Use when working on developer tool creation, CLI development, and productivity enhancement, including tool architecture, plugin systems, and user experience design, with emphasis on building efficient, extensible tools that significantly improve developer workflows.

Use when building TypeScript applications requiring advanced type systems, generics, or full-stack type safety. Invoke for type guards, utility types, tRPC integration, monorepo setup.

Use when designing, refactoring, or debugging Vue state management with Pinia, Vuex, composables, server state, forms, caching, and reactivity.

Use when implementing scalable WebSocket architectures, including bidirectional protocols, event-driven systems, and low-latency messaging for interactive applications.

Use when working on full-stack development, performance optimization, and enterprise solutions, including custom theme/plugin development, multisite management, security hardening, and scaling WordPress from small sites to enterprise platforms handling millions of visitors.

Guided installation and SDK integration skills for OpenRAG.

Best practices for writing Remotion animations that stay intuitive for agents and editable in Remotion Studio Visual Mode.

Best practices for writing Remotion React Markup

Install, repair, and validate DeepScientist on Windows with WSL2 until the Windows browser can open the DeepScientist Web UI. Use when an agent needs to set up or fix DeepScientist on a Windows machine, including WSL distro creation, Linux-side Node/Python prerequisites, Codex auth/relay configuration, WSL proxy troubleshooting, and final `ds doctor` or Web UI verification.

System architecture specialist for design decisions, ADR creation, scalability assessment, and technology selection

Create a tool function for an AG2 agent with type annotations, docstrings, and JSON return contracts

Scaffold Next.js components following best practices

Create cloud provider architecture diagrams using PlantUML syntax with official AWS, Azure, GCP, and Alibaba Cloud service icons. Best for multi-service cloud topologies and migration blueprints.

Create UML diagrams using PlantUML syntax. Best for software modeling — Class, Sequence, Activity, State Machine, Component, Use Case, and Deployment diagrams with concise text-based notation and auto-layout.

> End-to-end binder design using BindCraft hallucination. Use this skill when: (1) Designing protein binders with built-in AF2 validation, (2) Running production-quality binder campaigns, (3) Using different design protocols (fast, default, slow), (4) Need joint backbone and sequence optimization, (5) Want high experimental success rate. For backbone-only generation, use rfdiffusion. For QC thresholds, use protein-qc. For tool selection guidance, use binder-design.

Read and write compressed sequence files (gzip, bzip2, BGZF) using Biopython. Use when working with .gz or .bz2 sequence files. Use BGZF for indexable compressed files.

Parse and write protein structure files using Biopython Bio.PDB. Use when reading PDB, mmCIF, and MMTF files, downloading structures from RCSB PDB, or writing structures to various formats.

Modify protein structures using Biopython Bio.PDB. Use when transforming coordinates, removing atoms or residues, adding new entities, modifying B-factors and occupancies, or building structures programmatically.

> Ligand-aware protein sequence design using LigandMPNN. Use this skill when: (1) Designing sequences around small molecules, (2) Enzyme active site design, (3) Ligand binding pocket optimization, (4) Metal coordination site design, (5) Cofactor binding proteins. For standard protein design, use proteinmpnn. For solubility optimization, use solublempnn.

Select and configure linear solvers for systems Ax=b in dense and sparse problems. Use when choosing direct vs iterative methods, diagnosing convergence issues, estimating conditioning, selecting preconditioners, or debugging stagnation in GMRES/CG/BiCGSTAB.

> Generate protein backbones using RFdiffusion, a diffusion-based generative model for de novo protein structure generation. Use this skill when: (1) Designing binder scaffolds for a target protein, (2) Generating novel protein backbones from scratch, (3) Scaffolding functional motifs into new proteins, (4) Specifying hotspot residues for interface design, (5) Creating symmetric oligomers. For sequence design after backbone generation, use proteinmpnn. For structure validation, use alphafold or

Initialize a multi-agent orchestration project with AI SDK v5 agents,...

Diagnoses REST API failures by comparing HTTP logs against OpenAPI specs, identifies root cause by status code category, and generates working cURL repro commands. Use when an API call returns unexpected errors or status codes. Trigger with "why is my API failing", "debug this API error".

Use when designing a new system or subsystem, or making a structural change to an existing one — the system-design specialist that decomposes the architecture, sets module/service/component boundaries, analyzes failure modes and data flow, designs frontend behavior at scale (debouncing, virtualization, pagination, caching), and reviews structural changes for drift. Verifies against the architect persona standards.

> Generate authentication boilerplate with JWT, OAuth, and session support

> Generate authentication boilerplate with JWT, OAuth, and session support

Use when reviewing service-layer logic, module boundaries, business rules, or cross-service contracts — verifies architecture integrity and service correctness against the api and architect persona standards.

> Build production-ready API gateway with intelligent routing, authentication,...

> Build comprehensive API authentication and authorization system

Build a GraphQL server with schema-first design

> Build WebSocket servers for real-time bidirectional communication

> Convert Terraform to CloudFormation or generate CFN templates

> Generate React components from descriptions with TypeScript and tests

> Generate React components from descriptions with TypeScript and tests

Set up and optimize database connection pooling

> Generate utility CSS classes for spacing, colors, typography, and layout

> Generate utility CSS classes for spacing, colors, typography, and layout