Coding standards, frameworks, refactoring, and code review (16.4K skills)
Diagnose macOS app launch and trust failures by inspecting code signatures, app permissions, and Gatekeeper checks. Identify the failure category and get a minimal validation or repair sequence that distinguishes local development issues from distribution requirements.
Profile app launches and individual user flows in iOS Simulator with ETTrace. Collect traces with readable function names, identify CPU-heavy call stacks, and compare performance changes when recording conditions are consistent.
Build and run iOS apps in Simulator using XcodeBuildMCP, then inspect screens, interact with controls, and capture logs to investigate runtime problems. It also supports launching an already built app and checking that the expected app opened.
Choose Stripe APIs and payment interfaces for one-time payments, subscriptions, marketplaces, and financial accounts. Helps plan, modify, or review integrations, including connected account setup, payment method storage, and migration from deprecated APIs.
Refactor large macOS SwiftUI views into focused files and components. Clarify window state, selection, commands, and AppKit integration while preserving existing behavior and keeping the main layout stable as users change selections.
Customize windows in macOS SwiftUI apps, including titles, toolbars, drag areas, sizing, placement, and restoration. It helps give main windows, utility panels, and media players behavior suited to their purpose.
Apply Vercel Engineering’s performance guidelines when writing, reviewing, or refactoring React and Next.js code. Prioritize improvements to data fetching, downloaded code size, server processing, and unnecessary rendering using rules with explanations and code examples.
Implement and review Liquid Glass interfaces in macOS SwiftUI apps. The skill prioritizes standard layouts and controls, removes backgrounds that obscure system materials, and guides custom glass surfaces, toolbar grouping, search placement, and transitions.
Check macOS apps before distribution by reviewing bundle structure, code signing, and notarization readiness. Identify missing prerequisites and distinguish packaging problems from trust-policy issues, with concrete validation or repair steps to follow.
View and interact with an iOS Simulator inside the Codex browser. Display SwiftUI previews from importable Swift packages, see source edits update the running preview, and capture screenshots to document the visible results.
Add native macOS behavior when SwiftUI alone falls short. Choose a small AppKit bridge for views, windows, panels, or menus, while clarifying state ownership, data flow, and lifecycle risks that need validation.
Build and maintain interfaces with shadcn/ui components, reusable pieces such as forms, cards, and dialogs. Find suitable components, follow project settings, fix composition and styling issues, and review updates while preserving local changes.
Add focused runtime logs to a macOS app and verify that expected events appear. Uses Apple’s Logger to trace window, sidebar, menu, and background activity while keeping logs concise and excluding sensitive data.
Expose useful iOS app actions and content through Shortcuts, Siri, Spotlight, widgets, and controls. Guides action selection, system-facing data types, implementation, and checks that actions complete correctly or open the intended app workflow.
Refactor large SwiftUI screens into smaller views with clear inputs and state ownership. Organize actions, shared dependencies, and observable models while preserving existing layout and behavior, making the code easier to read and test.
Create websites, dashboards, games, and app interfaces from image-generated design concepts. The skill turns the accepted concept into reusable UI components, implements working controls, and checks browser rendering, interactions, and responsive layouts against the design.
Write, review, and optimize Postgres queries, database structures, and configuration using guidance maintained by Supabase. Prioritized rules and SQL examples help assess query speed, connections, indexes, and row-level security, which controls access to individual rows.
Build dense, frequently updated charts with Canvas2D, including zooming, clicking, and dragging. Guides rendering performance, mobile interactions, and the use of SVG or HTML for labels, controls, and accessibility.
Create dark-themed diagrams of systems, cloud infrastructure, security, or networks in a single HTML file. Color-coded components and connection arrows explain the structure, with built-in controls for copying images and exporting PNG or PDF files.
Turn an early software idea into a concrete recommendation or implementation plan. Assess whether to build, compare approaches, and define success criteria, constraints, tests, and handoff steps so another engineer or agent can proceed.
Investigate errors, crashes, and failures after updates using reproducible steps, logs, and runtime checks. Identify the root cause before making authorized fixes, then verify the result and check for the same problem elsewhere.
Audit Claude, Codex, or Pi configuration, instruction conflicts, hooks, and MCP connections to external tools. It also checks safeguards for maintaining AI-assisted projects and returns prioritized findings with evidence and concrete corrective or diagnostic steps.
Review code changes and pull requests, assess release readiness, or triage issues using project rules and current evidence. Reports identify concrete triggers and verification gaps, while authorized shipping tasks include checks of the resulting delivery state.
Review code for readability, security weaknesses, performance bottlenecks, test quality, and ease of maintenance. Receive findings grouped by importance, with explanations and concrete suggestions that reflect the project's context and constraints.