Add Sparkle auto-update support to a native macOS app. Use this skill whenever the user wants to add auto-updates, implement Sparkle, set up an appcast feed, add "Check for Updates" to their app, or integrate automatic update checking. Also trigger when the user mentions Sparkle, appcast, SUFeedURL, EdDSA signing, or…
Add a Dynamic Island-style notch UI to a macOS app. Use this skill whenever the user wants to create a notch overlay, notch extender, Dynamic Island for Mac, notch indicator, or any UI that extends from the MacBook notch area. Also trigger when the user mentions "notch shape", "notch window", "notch cutout", "notch…
Essential native macOS development patterns that web developers don't know about. Use this skill whenever the user is building a macOS app and needs guidance on native patterns, or when they ask about menu bar apps, floating panels, window levels, keyboard shortcuts, file pickers, clipboard, drag and drop, screen…
Expert skill for building CLI applications with Cobra and Viper, authored by spf13 — the original creator of both libraries. Covers command-first architecture, decoupled business logic, configuration management, environment variable binding, context-aware commands, and in-memory CLI testing. Use whenever a Go CLI or…
Expert skill for safe file operations in Go using spf13/fileflow (move, copy, rename across filesystems with conflict-safe naming) and spf13/pathologize (make filenames and path segments safe on every OS). Use whenever Go code moves, copies, renames, downloads, extracts, or generates files on disk, or builds a…
Expert Go programming skill authored by spf13 (former Go team lead, author of Cobra, Viper, Hugo, Afero). Covers idiomatic Go — package design, error handling, interfaces, concurrency, testing, and project layout, current through Go 1.27. Use whenever Go code is written, reviewed, debugged, or refactored — any .go…
Measure what a change to an AI coding setup actually saved, in dollars. Compares recorded before/after usage from the AI Insights MCP server — either two specific sessions by id, or everything in one period against another — and attributes the cost difference to the factor that moved it: fewer API calls, less context…
Review recorded AI coding-tool usage and recommend concrete optimizations. Reads real token, cost, session and harness-configuration data from the AI Insights MCP server, then reports ranked, evidence-backed fixes — trimming instruction files, raising the prompt-cache hit rate, right-sizing models, cutting MCP…