Weak domain layers scatter business rules and make validation inconsistent. This skill helps Claude, Codex, and Claude Code design expressive Rust domain models.

Rust Lambda handlers often mix I/O and CPU work, which can block runtimes or waste parallelism. This skill guides Claude, Codex, and Claude Code toward clear async, blocking, and Rayon patterns.

Rust async APIs can be hard to design when traits, closures, and dispatch choices interact. This skill gives practical guidance for modern native async patterns and async-trait migration.

Choosing among frontend libraries can waste time and create inconsistent dependencies. This skill maps a defined UI task to an opinionated, curated library recommendation.

Sonner integrations can fail through duplicate toasters, server-side calls, styling conflicts, or incorrect promise handling. This skill provides focused setup, API, styling, and troubleshooting guidance.

Mobile animations often stutter, ignore accessibility, or conflict with gestures. This skill designs Expo motion with suitable tools, timing, threading, and device checks.

Teams often add brittle tests that mirror implementation details instead of user behavior. This skill guides Claude, Codex, and Claude Code to write focused tests for critical workflows.

Teams can introduce conflicting frameworks, services, or build tools when stack decisions are scattered. This skill guides Claude, Codex, and Claude Code to follow documented technology standards.

Inconsistent error handling can hide failures and confuse users. This skill guides Claude, Codex, and Claude Code toward clear exceptions, validation, cleanup, and recovery paths.

Project teams often lose consistency across branches, documentation, configuration, and reviews. This skill gives Claude, Codex, and Claude Code shared guidance for development conventions.

Inconsistent code slows reviews and makes maintenance harder. This skill gives Claude, Codex, and Claude Code clear rules for readable, consistent code.

Responsive interfaces often fail across phones, tablets, and desktops. This skill gives Claude, Codex, and Claude Code focused guidance for mobile-first layouts, breakpoints, and touch-friendly UI.

Frontend styling often drifts across files, components, and frameworks. This skill guides Claude, Codex, and Claude Code toward consistent CSS methods and design tokens.

Frontend teams need consistent component structure across frameworks. This skill guides Claude, Codex, and Claude Code to design focused, reusable UI components.

Frontend teams often miss keyboard, semantic, and screen reader requirements during routine UI work. This skill guides Claude, Codex, and Claude Code to apply accessibility checks while creating or editing interfaces.

Frontend bugs can be hard to reproduce from code alone. This skill guides Claude, Codex, and Claude Code through Chrome DevTools MCP evidence gathering.

Poor tests often verify mocks instead of real application behavior. This skill gives Claude, Codex, and Claude Code a checklist for safer TDD, focused mocks, and cleaner test design.

Complex bugs often appear far from their original trigger. This skill guides backward tracing, targeted instrumentation, and test isolation to find the source.

Chrome extension teams need safe Manifest V3 architecture, permissions, and review support. This skill guides Claude, Codex, and Claude Code through secure design, implementation, testing, and publishing tasks.

Invalid data often bypasses a single validation point and fails later in execution. This skill guides Claude, Codex, and Claude Code to add layered checks that make recurring bugs harder to reintroduce.