FOSUtilities

Discover FOSUtilities APIs before writing helper code. Use when reaching for JSON/Codable encoding-decoding, wire-format date formatting, URLSession/HTTP fetching, WebSockets, network mocking in tests, collection grouping or throttled iteration, string casing/hashing/obfuscation/CSV parsing, hex or rounded-number formatting, semantic version comparison, semaphores or async-from-sync bridging, typed model identifiers, runtime environment/bundle-version checks (simulator/TestFlight detection), ViewModel declaration and localization, form fields and validation, ServerRequests/CRUD, SwiftUI ViewModel binding, Vapor boot wiring/routes/Fluent/Leaf/middleware, ViewModel or ServerRequest or UI testing, or PDF generation — in any project that imports FOSFoundation, FOSMVVM, FOSMVVMVapor, FOSTesting, or FOSReporting.

Update the FOSUtilities API catalog after API changes. Runs the symbol-graph audit, fixes stale entries, writes curated entries for gaps, maintains the reach-for index, and bumps the plugin version. Use in the FOSUtilities repo when CI's catalog audit warns/fails, after adding or renaming public API, or when a reach-for index line is missing.

Generate FOSMVVM Fields protocols with validation rules, FormField definitions, and localized messages. Define form contracts once, validate everywhere.

Generate Fluent DataModels for FOSMVVM server-side persistence. Scaffolds models, migrations, and tests for database-backed entities.

Generate Leaf templates for FOSMVVM WebApps. Create full-page views and HTML-over-the-wire fragments that render ViewModels.

Plan FOSMVVM implementation work with a design-first, DocC-first gate. Use BEFORE writing an implementation plan that adds or changes FOSMVVM types, protocols, ViewModels, requests, identities, or persistence — it applies FOSMVVM's design and documentation discipline up front, then hands task decomposition to your generic plan process.

Generate React components that render FOSMVVM ViewModels. Scaffolds ViewModelView pattern with hooks, loading states, and TypeScript types.

Review FOSMVVM code against per-area check files. Triages changed files by area, dispatches one subagent per affected area for parallel review, emits severity-tagged report. Report-only, no auto-fix. Use when reviewing a branch before merge, sweeping the codebase periodically, or in CI.

Generate FOSMVVM ServerRequest types for CRUD operations and client-server communication. Scaffolds requests, response bodies, and typed error handling.

Generate ServerRequest tests using VaporTesting. Covers typed request/response validation for Show, Create, Update, and Delete operations.

Set up the @main App struct for FOSMVVM SwiftUI apps. Configures MVVMEnvironment, deployment URLs, and test infrastructure.

Generate SwiftUI views that render FOSMVVM ViewModels. Scaffolds ViewModelView pattern with binding, loading states, and previews.

Generate UI tests for FOSMVVM SwiftUI views using XCTest and FOSTestingUI. Covers accessibility identifiers, ViewModelOperations, and test data transport.

Generate FOSMVVM ViewModels for SwiftUI screens, pages, and components. Scaffolds RequestableViewModel, localization bindings, and stub factories.

Generate ViewModel tests with codable round-trip, versioning stability, and multi-locale translation verification.

Generate new Claude Code skills following the context-aware pattern. Scaffolds SKILL.md, reference docs, and frontmatter.