Languages & Frameworks for Claude Code

Write idiomatic C# code with modern language features, async patterns, and LINQ. Masters .NET ecosystem, Entity Framework Core, and ASP.NET Core. Use PROACTIVELY for C# optimization, refactoring, or complex .NET solutions.

Query ChEMBL's bioactive molecules and drug discovery data. Search compounds by structure/properties, retrieve bioactivity data (IC50, Ki), find inhibitors, perform SAR studies, for medicinal chemistry.

Expert in building Chrome Extensions using Manifest V3. Covers background scripts, service workers, content scripts, and cross-context communication.

Quantum computing framework for building, simulating, optimizing, and executing quantum circuits. Use this skill when working with quantum algorithms, quantum circuit design, quantum simulation (noiseless or noisy), running on quantum hardware (Google, IonQ, AQT, Pasqal), circuit optimization and compilation, noise modeling and characterization, or quantum experiments and benchmarking (VQE, QAOA, QPE, randomized benchmarking).

Migrate prompts and code from Claude Sonnet 4.0, Sonnet 4.5, or Opus 4.1 to Opus 4.5. Use when the user wants to update their codebase, prompts, or API calls to use Opus 4.5. Handles model string updates and prompt adjustments for known Opus 4.5 behavioral differences. Does NOT migrate Haiku 4.5.

Pragmatic coding standards - concise, direct, no over-engineering, no unnecessary comments

Expert patterns for Clerk auth implementation, middleware, organizations, webhooks, and user sync Use when: adding authentication, clerk auth, user authentication, sign in, sign up.

Use this agent when building command-line tools and terminal applications that require intuitive command design, cross-platform compatibility, and optimized developer experience. Specifically:\\n\\n<example>\\nContext: A development team needs a new CLI tool for managing local database migrations and seeding with interactive workflows.\\nuser: \"We need a CLI tool that lets developers manage database migrations. It should support interactive prompts, show migration status, handle rollbacks, and

ClickHouse database patterns, query optimization, analytics, and data engineering best practices for high-performance analytical workloads.

Expert Clojure pair programmer with REPL-first methodology, architectural oversight, and interactive problem-solving. Enforces quality standards, prevents workarounds, and develops solutions incrementally through live REPL evaluation before file modifications.

Deploy applications and infrastructure to Cloudflare using Workers, Pages, and related platform services. Use when the user asks to deploy, host, publish, or set up a project on Cloudflare.

Constraint-based metabolic modeling (COBRA). FBA, FVA, gene knockouts, flux sampling, SBML models, for systems biology and metabolic engineering analysis.

Designs feature architectures by analyzing existing codebase patterns and conventions, then providing comprehensive implementation blueprints with specific files to create/modify, component designs, data flows, and build sequences

Simplifies and refines code for clarity, consistency, and maintainability while preserving all functionality. Use when asked to "simplify code", "clean up code", "refactor for clarity", "improve readability", or review recently modified code for elegance. Focuses on project-specific best practices.

Simplifies and refines code for clarity, consistency, and maintainability while preserving all functionality. Focuses on recently modified code unless instructed otherwise.

Specialist for finding code patterns and examples in the codebase, providing concrete implementations that can serve as templates for new work

Universal coding standards, best practices, and patterns for TypeScript, JavaScript, React, and Node.js development.

Computer vision and image processing specialist. Use PROACTIVELY for image analysis, object detection, face recognition, OCR implementation, and visual AI applications.

Expert in latest library versions, best practices, and correct syntax using up-to-date documentation

Automatically fetch latest library/framework documentation for Claude Code via Context7 API

Convex reactive backend expert: schema design, TypeScript functions, real-time subscriptions, auth, file storage, scheduling, and deployment.

Core component library and design system patterns. Use when building UI, using design tokens, or working with the component library.

Write idiomatic C++ code with modern features, RAII, smart pointers, and STL algorithms. Handles templates, move semantics, and performance optimization.

Use this agent when building high-performance C++ systems requiring modern C++20/23 features, template metaprogramming, or zero-overhead abstractions for systems programming, embedded systems, or performance-critical applications. Specifically:\\n\\n<example>\\nContext: Implementing a low-latency trading system that needs custom memory allocators and lock-free data structures.\\nuser: \"We need a high-frequency trading engine that processes 100k orders/sec with sub-microsecond latency. Requireme

Use this agent when building ASP.NET Core web APIs, cloud-native .NET solutions, or modern C# applications requiring async patterns, dependency injection, Entity Framework optimization, and clean architecture. Specifically:\\n\\n<example>\\nContext: Building a production ASP.NET Core REST API with database integration, authentication, and comprehensive testing.\\nuser: \"I need to create an ASP.NET Core 8 API with EF Core, JWT authentication, Swagger documentation, and 85%+ test coverage. Should

Perform janitorial tasks on C#/.NET code including cleanup, modernization, and tech debt remediation.

Expert assistant for developing Model Context Protocol (MCP) servers in C#

Write modern C# code with advanced features like records, pattern matching, and async/await. Optimizes .NET applications, implements enterprise patterns, and ensures comprehensive testing.

Expert at designing and creating VS Code custom agents with optimal configurations

Database architecture and design specialist. Use PROACTIVELY for database design decisions, data modeling, scalability planning, microservices data patterns, and database technology selection. This agent designs and plans; hand off PostgreSQL tuning to postgres-pro and Neon-specific work to neon-database-architect. Specifically:\n\n<example>\nContext: A startup is building a new SaaS platform for project management and needs to design the database from scratch.\nuser: \"We're starting a new mult

Database design principles and decision-making. Schema design, indexing strategy, ORM selection, serverless databases.

Design robust, scalable database schemas for SQL and NoSQL databases. Provides normalization guidelines, indexing strategies, migration patterns, constraint design, and performance optimization. Ensures data integrity, query performance, and maintainable data models.

Pythonic wrapper around RDKit with simplified interface and sensible defaults. Preferred for standard drug discovery: SMILES parsing, standardization, descriptors, fingerprints, clustering, 3D conformers, parallel processing. Returns native rdkit.Chem.Mol objects. For advanced control or custom parameters, use rdkit directly.

Expert guidance for distributed training with DeepSpeed - ZeRO optimization stages, pipeline parallelism, FP16/BF16/FP8, 1-bit Adam, sparse attention

Validate user understanding of code, design patterns, and implementation details through guided questioning.

Design optimized database schemas with proper relationships, constraints, and performance considerations

Design RESTful API architecture with comprehensive endpoints, authentication, and documentation

Pixel-perfect Figma to React conversion using coderio. Generates production-ready code (TypeScript, Vite, TailwindCSS V4) with high visual fidelity. Features robust error handling, checkpoint recovery, and streamlined execution via helper script.