Programming languages: skills, plugins, subagents, slash commands and mcp servers

pufferlib K-Dense-AI skill Skill for PufferLib: choose between native 5.0, PyPI 3.0.0, or pinned 4.0, validate Gymnasium contracts, adapt environments, and review checkpoints safely. Requires Python 3.10+ and native C/CUDA for training. Claude Code CX Codex Cursor +1 1,900installs simpy K-Dense-AI skill Builds, tests, and inspects process-based discrete-event simulations using SimPy. Helpful for modeling service queues, logistics, and resource contention. Claude Code CX Codex Cursor +1 1,900installs navigation-3 Google LLC skill A reference skill for Jetpack Navigation 3: the move from Navigation 2 plus ready recipes for deep links, multiple back stacks, scenes, Hilt and ViewModel. Claude Code CX Codex Cursor +1 3,200installs swift-expert https://github.com/Jeffallan skill A Swift skill that walks the agent through architecture, SwiftUI state, async/await and actors, with build checks in between. Built for iOS and macOS work. Claude Code CX Codex Cursor +1 4,100installs vue-expert-js https://github.com/Jeffallan skill Builds Vue 3 code in JavaScript with JSDoc annotations instead of TypeScript. Use it for components, composables, routing, and state management in JS-only projects. Claude Code CX Codex Cursor +1 4,000installs V3 Core Implementation ruvnet skill Builds the claude-flow v3 core in TypeScript and hands each domain to the core-implementer subagent. Claude Code CX Codex Cursor +1 1,100installs freecad-scripts official github skill Writes FreeCAD Python scripts and macros: 3D geometry, parametric objects, PySide dialogs. Useful when you automate CAD work. GitHub Copilot 1,200installs fact-check leonardomso skill Verifies technical accuracy in JavaScript educational pages by checking code snippets against MDN documentation and the ECMAScript specification. Claude Code CX Codex Cursor +1 331installs v4-new-features phaserjs skill Skill for learning Phaser 4 updates: Filters replace FX, RenderNodes, new game objects (CaptureFrame, Gradient, Noise, SpriteGPULayer), and tint modes. Helps navigate the rewritten WebGL engine. Claude Code CX Codex Cursor +1 951installs dart-use-doc-examples flutter skill Teaches agents to inject external code examples into Dartdoc using the {@example} directive instead of inline blocks. Claude Code CX Codex Cursor +1 6,300installs write-concept leonardomso skill Creates and reviews JavaScript concept pages for 33 JavaScript Concepts. Use it when adding, rewriting, or checking material in /docs/concepts/. Claude Code CX Codex Cursor +1 305installs cargo-fuzz trailofbits skill Sets up cargo-fuzz inside a Cargo-based Rust crate and walks through the harness, sanitizers and crash triage. Claude Code CX Codex Cursor +1 5,400installs lsp-setup official github skill Installs a language server and configures LSP for Copilot CLI. Use it when you need code navigation such as go-to-definition or find-references. GitHub Copilot 1,100installs dart-use-path-package flutter skill Teaches the agent to handle Dart file paths via package:path, avoiding string operations that break on Windows. Claude Code CX Codex Cursor +1 5,900installs swiftdata-pro Paul Hudson skill A skill for writing, reviewing, and improving SwiftData code with modern APIs and best practices. Essential when working with SwiftData-based projects in Swift. Claude Code CX Codex Cursor +1 9,200installs typescript-advanced-types sickn33 skill Teaches the agent generics, conditional and mapped types in TypeScript, and stays honest about where type checking stops. Claude Code CX Codex Cursor +1 1,300installs atheris trailofbits skill Guides setup of coverage-guided fuzzing for Python code and C extensions with Atheris. Use it to investigate crashes and memory corruption. Claude Code CX Codex Cursor +1 5,200installs dwarf-expert trailofbits skill Inspects DWARF debug sections in compiled binaries, verifies DIE trees, and assists with parsers. Handy when analyzing compiled code. Claude Code CX Codex Cursor +1 5,200installs dart-add-unit-test dart-lang skill Writes Dart and Flutter unit tests with package:test: files under test/, mockito mocks when dependencies get in the way, and a rerun loop until the suite is green. Claude Code CX Codex Cursor +1 19,100installs dart-run-static-analysis dart-lang skill Runs dart analyze to catch errors and dart fix --apply to resolve mechanical linter issues. Helps verify Dart code quality during development and before commits. Claude Code CX Codex Cursor +1 19,000installs ios-developer Seth Hobson subagent Builds native iOS apps using Swift 6 and SwiftUI for iOS 18, configures data storage, and handles App Store deployment guidelines. Claude Code CX Codex Cursor 2,684installs dart-use-pattern-matching dart-lang skill A skill that tells the agent how to use Dart 3 patterns, switch expressions and destructuring on real code: JSON, sealed classes, path segments. Claude Code CX Codex Cursor +1 18,700installs rust-skills leonardomso skill A Rust rulebook the agent reads before it writes: 265 rules in 26 categories. Useful when you review a module or fight the borrow checker. Claude Code CX Codex Cursor +1 6,400installs dart-generate-test-mocks dart-lang skill A Dart testing skill: the agent injects external services through constructors, generates mock classes with mockito and build_runner, then writes the unit test. Claude Code CX Codex Cursor +1 18,200installs dart-build-cli-app dart-lang skill Skill for building command-line applications in Dart. Provides architectural patterns, entrypoint structure, exit codes, stream routing, and subprocess spawning. Claude Code CX Codex Cursor +1 18,000installs dart-migrate-to-checks-package dart-lang skill Migrates Dart test suites from legacy package:matcher to package:checks. Useful when modernizing test assertions for static type safety and detailed diagnostics. Claude Code CX Codex Cursor +1 18,000installs react19-source-patterns official github skill A reference for moving React source files to React 19, covering API changes, refs, context, and props. Useful during an existing project upgrade. GitHub Copilot 967installs node mcollina skill Gives an agent Node.js and TypeScript guidance, from running .ts files directly to streams, tests and graceful shutdown. Claude Code CX Codex Cursor +1 5,900installs php-pro VoltAgent Community subagent Claude Code subagent for PHP 8.3+, Laravel, and Symfony projects requiring strict typing, PHPStan level 9 checks, and async patterns. Claude Code 2,019installs golang-pro VoltAgent Community subagent This subagent examines a Go project, helps implement changes, and guides testing and performance checks. Use it for work involving concurrency, microservices, or cloud-native applications. Claude Code 1,911installs php-pro Seth Hobson subagent Writes idiomatic PHP 8+ code focused on low memory usage. Employs generators, SPL data structures, and native standard library features. Claude Code CX Codex Cursor 2,019installs react-19 prowler-cloud skill Skill for React 19 with React Compiler: no manual memoization, server components first, ref as a prop. Claude Code CX Codex Cursor +1 671installs godot-gdscript gamedev-skills skill Guides coding assistants in writing statically typed GDScript 2.0 for Godot 4.7 and porting legacy scripts from Godot 3.x. Helpful when structuring node lifecycles and signals. Claude Code CX Codex Cursor +1 6,200installs golang-pro Seth Hobson subagent This subagent helps design Go services, inspect concurrent code, and profile performance. Use it when a task calls for tested code and careful goroutine handling. Claude Code CX Codex Cursor 1,911installs unity-csharp-scripting gamedev-skills skill Guides coding agents in writing Unity 6.3 LTS MonoBehaviour scripts, managing lifecycle callbacks, Inspector serialization, and coroutine execution. Claude Code CX Codex Cursor +1 5,700installs analyzing-dotnet-performance dotnet skill Scans C# and .NET code for about 50 performance anti-patterns across async, memory, LINQ, and I/O. Handy when auditing hot paths and memory allocations before release. Claude Code CX Codex Cursor +1 4,800installs manimce-best-practices adithya-s-k skill A skill that steers the agent through Manim Community Edition: scenes, MathTex, 3D, camera work. Useful once a project starts with from manim import *. Claude Code CX Codex Cursor +1 3,900installs migrate-to-rust official google skill Migrates legacy C++, Fortran, Java, and Python codebases to safe Rust with telemetry benchmarks. Claude Code Gemini CLI CX Codex 538installs unreal-cpp-gameplay gamedev-skills skill Teaches the agent to write UE5 gameplay C++: reflection macros, Gameplay Framework class roles, and module dependencies in *.Build.cs. Claude Code CX Codex Cursor +1 5,000installs dotnet-webapi dotnet skill A coding-agent skill for ASP.NET Core Web API work: it keeps new endpoints in the style the project already uses, adds OpenAPI metadata and central error handling. Claude Code CX Codex Cursor +1 4,200installs