Coding standards, frameworks, refactoring, and code review (18.4K skills)
Specifies standards for RestController classes, including API route mappings, HTTP method annotations, dependency injection, and error handling with ApiResponse and GlobalExceptionHandler.
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Enhanced code search with custom ripgrep binary supporting ES module extensions and advanced patterns.
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Rust programming expert including ownership, borrowing, lifetimes, async Tokio patterns, error handling, trait system, performance optimization, testing, and production systems development
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Prioritizes the use of new features available in Python 3.12 and later versions.
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Compiler-level code intelligence via native LSP — definitions, references, types, call hierarchies, and diagnostics.
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Guide developers in creating Model Context Protocol (MCP) servers. Use for building MCP tools that enable LLMs to interact with external services. Covers TypeScript (primary) and Python FastMCP (secondary), tool annotations, Zod/Pydantic validation, and evaluation question creation.
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iOS development expert including SwiftUI, UIKit, and Apple frameworks
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Shell out to OpenAI Codex CLI for headless code generation, analysis, and question-answering. Optimized for code tasks. Requires OPENAI_API_KEY env var.
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Shell out to Claude Code CLI to invoke a second Claude session headlessly. Useful for cross-validation, second opinions, and isolated analysis without sharing current agent context. Requires Anthropic account.
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Java and Spring Boot expert including REST APIs, JPA, and microservices
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Modern Python tooling best practices using uv, ruff, ty, and pytest. Mandates the Trail of Bits Python coding standards for project setup, dependency management, linting, type checking, and testing. Based on patterns from trailofbits/cookiecutter-python.
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Applies general coding standards and best practices for Kafka development with Scala.
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Node.js backend expert including Express, NestJS, and async patterns
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Entity and relation tracking skill using MCP memory server patterns and local knowledge graph storage. Build persistent knowledge graphs of entities, relationships, and observations across agent sessions. Covers the MCP memory server (@modelcontextprotocol/server-memory), local JSON-based graphs, and entity-relation querying patterns for long-running agents.
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Next.js framework expert including App Router, Server Components, and API routes
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Use when the user wants to use Google Gemini for analysis, large files or codebases, sandbox execution, or brainstorming. Uses headless Gemini CLI scripts (no MCP). Triggers on "use Gemini", "analyze with Gemini", "large file", "sandbox", "brainstorm with Gemini".
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Shell out to Cursor Agent CLI for headless IDE-aware code tasks. Supports multi-model routing (auto mode routes to Claude, Gemini, GPT). Requires Cursor Pro/Business subscription.
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Next.js 16 caching model expertise covering the 'use cache' directive, cacheLife() API, cacheTag() for invalidation, cacheComponents configuration, and Partial Prerendering (PPR). Use when implementing caching strategies in Next.js 16+ applications, migrating from unstable_cache, or optimizing server component rendering.
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GitHub API operations - repositories, issues, pull requests, actions, code security, discussions, gists, and more. Use for GitHub-related tasks like managing PRs, issues, searching code, and monitoring workflows.
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Frontend development expert including UI/UX patterns, responsive design, and accessibility
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File system operations guidance - read, write, search, and manage files using Claude Code's built-in tools.
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Go programming expert including APIs, gRPC, concurrency, and best practices
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Elixir and Phoenix expert including OTP, Ecto, and functional programming
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Advanced Git operations wrapper. Optimizes token usage by guiding complex git workflows into efficient CLI commands.
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