Service Duplicate Prevention Check

Desired functionality: $ARGUMENTS

Before creating ANY new service, verify it doesn't already exist.

Step 1: Search Existing Services

Search Services/ directory for related functionality:

Core Services

• HouseholdService — Household management, CloudKit sharing, member invitations
• RecipeService — Recipe CRUD
• WeeklyListService — Grocery list CRUD
• MealPlanService — Meal plan operations
• IngredientTemplateService — Template management, normalization, deduplication
• IngredientParsingService — PUBLIC API for ingredient parsing (3-tier hybrid)
• RecipeImportService — Recipe import orchestrator
• OptimizedRecipeDataService — Recipe queries
• CloudKitSyncMonitor — Real-time sync tracking
• UserPreferencesService — Settings

Utility Services

• RecipeScalingService — 0.25x-4x scaling
• QuantityMergeService — Intelligent quantity consolidation
• UnitConversionService — cups/tbsp/tsp, lbs/oz
• GroceryMergeService — Duplicate grocery consolidation
• IngredientAutocompleteService — Search suggestions
• ParsingTelemetryService — Telemetry collection
• KeychainHelper — Secure storage
• DuplicateDetectionService — Import duplicate avoidance

Import Services

• RecipeJSONLDExtractor — JSON-LD schema parsing
• WKWebViewExtractor — WKWebView DOM scraping
• ImageOCRService — Vision framework OCR
• OCRLineClassifier — Line classification
• FoundationModelsExtractor — LLM-based extraction

Step 2: Can an Existing Service Be Extended?

For each potentially related service found, assess:

• Does it already handle the desired functionality?
• Can a new method be added to it?
• Would extending it violate single responsibility?

Step 3: Report

## Service Check: [Functionality]

### Existing Related Services
- [Service name]: [relevance to desired functionality]

### Recommendation
- [ ] **Extend existing service** — [which one, what to add]
- [ ] **Create new service** — [justification for why existing services can't cover it]

### If Creating New Service
Follow the service layer pattern in `docs/architecture/service-layer-pattern.md`:
- @MainActor class with @Published errorMessage and isLoading
- Intent-style methods with error handling
- Single context.save() per operation