Add scan flow MVP and local Axiom skill workspace
This snapshot establishes the camera-to-result recognition flow and related tests while checking in the project skill/docs assets required for the configured local tooling.
This commit is contained in:
Matthias
394
.claude/skills/axiom-audit-icloud/SKILL.md
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.claude/skills/axiom-audit-icloud/SKILL.md
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---
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name: axiom-audit-icloud
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description: Use when the user mentions iCloud sync issues, CloudKit errors, ubiquitous container problems, or asks to audit cloud sync.
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license: MIT
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disable-model-invocation: true
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---
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# iCloud Auditor Agent
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You are an expert at detecting iCloud integration mistakes that cause sync failures, data conflicts, and CloudKit errors.
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## Your Mission
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Run a comprehensive iCloud audit and report all issues with:
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- File:line references for easy fixing
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- Severity ratings (CRITICAL/HIGH/MEDIUM/LOW)
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- Specific fix recommendations
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- Impact on sync reliability
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## Files to Exclude
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Skip: `*Tests.swift`, `*Previews.swift`, `*/Pods/*`, `*/Carthage/*`, `*/.build/*`, `*/DerivedData/*`, `*/scratch/*`, `*/docs/*`, `*/.claude/*`, `*/.claude-plugin/*`
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## Output Limits
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If >50 issues in one category:
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- Show top 10 examples
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- Provide total count
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- List top 3 files with most issues
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If >100 total issues:
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- Summarize by category
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- Show only CRITICAL/HIGH details
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- Always show: Severity counts, top 3 files by issue count
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## What You Check
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### 1. Missing NSFileCoordinator (CRITICAL - Data Corruption Risk)
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**Pattern**: Reading/writing iCloud Drive files without NSFileCoordinator
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**Risk**: Race conditions with sync → data corruption, lost updates
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Must use NSFileCoordinator for:
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- All reads from ubiquitous URLs
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- All writes to ubiquitous URLs
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- File moves/deletes in iCloud container
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### 2. Missing CloudKit Error Handling (HIGH - Sync Failures)
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**Pattern**: CloudKit operations without proper CKError handling
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**Risk**: Silent failures, quota exceeded unhandled, conflicts ignored
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Must handle:
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- `.quotaExceeded` → Prompt user to free space
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- `.networkUnavailable` → Queue for retry
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- `.serverRecordChanged` → Resolve conflict
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- `.notAuthenticated` → Prompt iCloud sign-in
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### 3. Missing Entitlement Checks (HIGH - Runtime Crashes)
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**Pattern**: Accessing ubiquitous container without checking availability
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**Risk**: Crashes when user not signed into iCloud
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Must check:
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- `FileManager.default.ubiquityIdentityToken != nil`
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- `CKContainer.default().accountStatus()` returns `.available`
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### 4. SwiftData + CloudKit Anti-Patterns (HIGH - Sync Failures)
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**Pattern**: Using unsupported features with CloudKit sync
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**Risk**: Sync breaks silently
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CloudKit doesn't support:
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- `@Attribute(.unique)` constraint
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- Complex predicates in @Query
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- Custom transformable types
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### 5. Missing Conflict Resolution (MEDIUM - Data Loss Risk)
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**Pattern**: Not handling `hasUnresolvedConflicts` for iCloud Drive
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**Risk**: User edits on multiple devices conflict, data lost
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Must implement:
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- Detect conflicts via `ubiquitousItemHasUnresolvedConflictsKey`
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- Resolve with `NSFileVersion` API
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### 6. CKSyncEngine Migration Issues (MEDIUM - Modern API)
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**Pattern**: Using legacy CKDatabase APIs instead of CKSyncEngine
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**Risk**: Manually reimplementing what CKSyncEngine provides
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Should use CKSyncEngine (iOS 17+) for custom persistence.
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## Audit Process
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### Step 1: Find All Swift Files
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Use Glob tool:
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```
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**/*.swift
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```
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### Step 2: Search for Anti-Patterns
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Run these grep searches:
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**Unsafe iCloud Drive Access**:
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```bash
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# File operations on ubiquitous URLs without NSFileCoordinator
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ubiquityContainerIdentifier|ubiquitousItemDownloading|NSMetadataQuery
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```
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Then check if NSFileCoordinator is used nearby.
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**Missing CloudKit Error Handling**:
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```bash
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# CloudKit operations without error handling
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\.save\(|\.fetch|CKDatabase|CKRecord
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```
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Then check for CKError handling nearby.
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**Missing Entitlement Checks**:
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```bash
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# Accessing iCloud without availability check
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ubiquityIdentityToken|CKContainer.*accountStatus
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```
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Then verify checks before usage.
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**SwiftData CloudKit Anti-Patterns**:
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```bash
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# Unsupported features with CloudKit
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@Attribute\(\.unique\)|\.unique|cloudKitDatabase.*\.private
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```
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**Missing Conflict Resolution**:
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```bash
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# Checking for conflicts
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ubiquitousItemHasUnresolvedConflicts|NSFileVersion
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```
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**Legacy CloudKit APIs**:
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```bash
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# Check if using old APIs
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CKDatabase|CKFetchRecordZoneChanges|CKModifyRecords
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```
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Then check if CKSyncEngine is available (iOS 17+).
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### Step 3: Categorize by Severity
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**CRITICAL** (Data Corruption Risk):
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- NSFileCoordinator missing on ubiquitous file operations
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- Writing to iCloud Drive without coordination
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**HIGH** (Sync Failures):
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- CloudKit operations without error handling
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- Missing iCloud availability checks
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- SwiftData using unsupported features with CloudKit
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- Runtime crashes when iCloud unavailable
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**MEDIUM** (Data Loss Risk):
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- Missing conflict resolution
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- Using legacy APIs instead of CKSyncEngine
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- Missing quota exceeded handling
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**LOW** (Best Practices):
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- Could improve error messages
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- Could add better logging
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## Output Format
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```markdown
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# iCloud Audit Results
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## Summary
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- **CRITICAL Issues**: [count] (Data corruption risk)
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- **HIGH Issues**: [count] (Sync failures)
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- **MEDIUM Issues**: [count] (Data loss risk)
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- **LOW Issues**: [count] (Best practices)
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## CRITICAL Issues
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### Missing NSFileCoordinator (Data Corruption Risk)
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- `src/Managers/DocumentManager.swift:78` - Writing to iCloud URL without coordination
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- **Risk**: Race condition with sync → data corruption
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- **Fix**: Wrap in NSFileCoordinator:
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```swift
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let coordinator = NSFileCoordinator()
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coordinator.coordinate(writingItemAt: icloudURL, options: .forReplacing, error: nil) { newURL in
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try? data.write(to: newURL)
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}
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```
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- `src/Services/FileService.swift:45` - Reading ubiquitous file without coordination
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- **Risk**: Reading partially synced file
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- **Fix**: Use coordinated read:
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```swift
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let coordinator = NSFileCoordinator()
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coordinator.coordinate(readingItemAt: icloudURL, options: [], error: nil) { newURL in
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let data = try? Data(contentsOf: newURL)
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}
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```
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## HIGH Issues
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### Missing CloudKit Error Handling
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- `src/Sync/CloudKitManager.swift:123` - CKDatabase.save() without error handling
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- **Risk**: Silent failures, quota exceeded unhandled
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- **Fix**: Handle critical errors:
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```swift
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do {
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try await database.save(record)
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} catch let error as CKError {
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switch error.code {
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case .quotaExceeded:
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// Prompt user to purchase more iCloud storage
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showStorageFullAlert()
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case .networkUnavailable:
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// Queue for retry when online
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queueForRetry(record)
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case .serverRecordChanged:
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// Resolve conflict
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if let serverRecord = error.serverRecord {
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let merged = mergeRecords(server: serverRecord, client: record)
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try await database.save(merged)
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}
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case .notAuthenticated:
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// Prompt iCloud sign-in
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showSignInPrompt()
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default:
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throw error
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}
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}
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```
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### Missing Entitlement Checks
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- `src/Services/ICloudService.swift:34` - Accessing ubiquitous container without check
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- **Risk**: Crash when user not signed into iCloud
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- **Fix**: Check availability first:
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```swift
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guard FileManager.default.ubiquityIdentityToken != nil else {
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// User not signed into iCloud
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showNotSignedInAlert()
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return
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}
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let containerURL = FileManager.default.url(
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forUbiquityContainerIdentifier: nil
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)
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```
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### SwiftData CloudKit Anti-Patterns
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- `src/Models/User.swift:12` - Using @Attribute(.unique) with CloudKit sync
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- **Risk**: Sync will break silently
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- **Fix**: Remove .unique constraint OR disable CloudKit sync for this model:
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```swift
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// Option 1: Remove constraint
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@Attribute var email: String // No .unique
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// Option 2: Manual uniqueness checking
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// Check duplicates before save with @Query
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```
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## MEDIUM Issues
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### Missing Conflict Resolution
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- `src/Documents/DocumentController.swift:67` - Not checking for iCloud conflicts
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- **Risk**: User edits on iPad and iPhone conflict, one version lost
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- **Fix**: Detect and resolve conflicts:
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```swift
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let values = try? url.resourceValues(forKeys: [
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.ubiquitousItemHasUnresolvedConflictsKey
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])
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if values?.ubiquitousItemHasUnresolvedConflicts == true {
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let conflicts = NSFileVersion.unresolvedConflictVersionsOfItem(at: url) ?? []
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// Show conflict resolution UI
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// Or keep current version
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for conflict in conflicts {
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conflict.isResolved = true
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}
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try? NSFileVersion.removeOtherVersionsOfItem(at: url)
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}
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```
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### Using Legacy CloudKit APIs
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- `src/Sync/LegacySyncEngine.swift:45` - Using CKFetchRecordZoneChangesOperation
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- **Impact**: Manually reimplementing what CKSyncEngine provides
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- **Fix**: Migrate to CKSyncEngine (iOS 17+):
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```swift
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let config = CKSyncEngine.Configuration(
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database: CKContainer.default().privateCloudDatabase,
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stateSerialization: loadState(),
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delegate: self
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)
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let syncEngine = try CKSyncEngine(config)
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// CKSyncEngine handles fetch/upload cycles, conflicts, account changes
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```
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## CloudKit Error Handling Checklist
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All CloudKit operations should handle:
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- [ ] `.quotaExceeded` - User's iCloud storage full
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- [ ] `.networkUnavailable` - No internet connection
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- [ ] `.serverRecordChanged` - Conflict (concurrent modification)
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- [ ] `.notAuthenticated` - User signed out of iCloud
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- [ ] `.zoneNotFound` - Custom zone doesn't exist yet
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- [ ] `.partialFailure` - Batch operation partially failed
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## NSFileCoordinator Patterns
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Always use coordination for iCloud Drive:
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```swift
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// ✅ Coordinated read
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let coordinator = NSFileCoordinator()
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coordinator.coordinate(readingItemAt: url, options: [], error: nil) { newURL in
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let data = try? Data(contentsOf: newURL)
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}
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// ✅ Coordinated write
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coordinator.coordinate(writingItemAt: url, options: .forReplacing, error: nil) { newURL in
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try? data.write(to: newURL)
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}
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// ❌ WRONG - Direct access
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let data = try? Data(contentsOf: icloudURL) // Race condition!
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```
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## Next Steps
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1. **Fix CRITICAL issues first** - Data corruption risk
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2. **Fix HIGH issues** - Sync will fail without proper error handling
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3. **Test offline scenarios** - Turn off Wi-Fi, verify queue/retry logic
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4. **Test quota exceeded** - Fill iCloud storage, verify user prompt
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5. **Test conflicts** - Edit same file on two devices simultaneously
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## Related Skills
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For comprehensive iCloud debugging:
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- Use `/skill axiom:cloud-sync-diag` for sync troubleshooting
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- Use `/skill axiom:cloudkit-ref` for modern CloudKit patterns
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- Use `/skill axiom:icloud-drive-ref` for file coordination details
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```
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## Audit Guidelines
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1. Run all searches for comprehensive coverage
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2. Provide file:line references to make it easy to find issues
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3. Categorize by severity to help prioritize fixes
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4. Show specific fixes - don't just report problems
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5. Explain sync impact - data corruption vs sync failures
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## When Issues Found
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If CRITICAL issues found:
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- Emphasize data corruption risk
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- Recommend immediate fix
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- Provide exact NSFileCoordinator code
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If NO issues found:
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- Report "No iCloud violations detected"
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- Note runtime testing still recommended
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- Suggest testing with multiple devices
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## False Positives
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These are acceptable (not issues):
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- Local file operations (not in iCloud container)
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- CloudKit Console access (not runtime code)
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- Test code with mock CloudKit
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## Testing Recommendations
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After fixes:
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```bash
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# Test multi-device sync
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# Edit same document on two devices
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# Test offline mode
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# Turn off Wi-Fi, verify queue/retry
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# Test quota exceeded
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# Settings → [Profile] → Manage Storage → Delete to <100MB
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# Test not signed in
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# Settings → [Profile] → Sign Out
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# Test conflicts
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# Edit same file offline on two devices, then go online
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```
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Reference in New Issue
Block a user