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Bogdan Timofte
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a month ago
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# HealthProbe – Multi-Model Development Guide
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## Overview
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HealthProbe is built by multiple AI models, each owning a distinct domain.
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This document defines boundaries, interfaces, and handoff contracts.
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---
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## Model Allocation
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| Domain | Owner | Tools |
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|--------|-------|-------|
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| **UI / SwiftUI Views** | Claude Code | Xcode, SwiftUI, CLAUDE.md |
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| **Data Models (SwiftData)** | Dedicated model session | Xcode, Swift |
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| **HealthKit Integration** | Dedicated model session | Xcode, HealthKit docs |
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| **Anomaly Detection Algorithms** | Dedicated model session | Swift, statistical references |
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| **Sync Monitoring** | Dedicated model session | Xcode, CloudKit docs |
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| **Documentation** | Claude Code + dedicated session | Markdown |
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| **Tests** | Dedicated model session | XCTest, Swift Testing |
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---
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## Directory Ownership
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```
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HealthProbe/
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├── Views/ ← Claude Code (UI)
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├── ViewModels/ ← Claude Code (UI)
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├── Utilities/ ← Claude Code (shared helpers, mocks)
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├── Models/ ← Models agent (SwiftData schemas)
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├── Services/ ← Services agent (HealthKit, anomaly, sync)
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└── Tests/ ← Tests agent
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```
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**Rule:** Each agent writes only within its owned directories.
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Cross-boundary changes require an explicit interface contract (protocol) first.
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---
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## Interface Contracts
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All service boundaries are defined as Swift protocols.
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Claude Code (UI) consumes protocols — never concrete implementations.
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### HealthMonitorProtocol
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```swift
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/// Owned by: Services agent
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/// Consumed by: UI (DashboardViewModel)
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protocol HealthMonitorProtocol {
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var currentStatus: HealthStatus { get }
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var lastChecked: Date? { get }
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func runCheck() async throws
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}
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```
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### AnomalyStoreProtocol
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```swift
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/// Owned by: Services agent
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/// Consumed by: UI (AnomalyListViewModel)
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protocol AnomalyStoreProtocol {
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var anomalies: [DetectedAnomaly] { get }
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func markResolved(_ anomaly: DetectedAnomaly) async throws
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}
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```
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### AuditTrailProtocol
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```swift
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/// Owned by: Services agent
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/// Consumed by: UI (AuditTrailView)
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protocol AuditTrailProtocol {
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var entries: [AuditTrailEntry] { get }
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func export() async throws -> Data // JSON
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}
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```
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### SyncMonitorProtocol
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```swift
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/// Owned by: Services agent
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/// Consumed by: UI (SyncViewModel)
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protocol SyncMonitorProtocol {
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var iCloudEnabled: Bool { get }
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var lastSyncDate: Date? { get }
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var stateChanges: [SyncStateChange] { get }
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}
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```
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---
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## Shared Types (Models Agent)
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These types are defined once in `Models/` and shared across all agents:
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```swift
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// Models/TypeDistributionBin.swift
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@Model
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final class TypeDistributionBin {
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var bucketStart: Date
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var bucketEnd: Date
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var count: Int
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}
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// Models/TypeCount.swift
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Bogdan Timofte
authored
3 weeks ago
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// TypeCount owns zero or more TypeDistributionBin records.
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// These bins store sample counts and import anchors, not raw health values.
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// Interface updated 2026-05-12 — see AGENTS.md
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// Models/HealthRecord.swift
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// HealthRecord stores one anonymized HealthKit record fingerprint plus its start/end dates.
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// It intentionally does not store raw health values, device identifiers, or source metadata.
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// UI may compare HealthRecord fingerprints between adjacent snapshots to expose losses
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// that are masked by newly-added records with the same total count.
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// High-volume snapshots store these records in TypeCount.recordArchiveData instead of
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// creating one SwiftData model per record, avoiding main-thread stalls after import.
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// Interface updated 2026-05-13 — see AGENTS.md
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// TypeDistributionBin also stores content hashes and HealthKit query anchors.
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// Import uses a global anchored query per data type so follow-up snapshots fetch only
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// HealthKit deltas instead of scanning calendar blocks with fixed per-query latency.
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Bogdan Timofte
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a month ago
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Bogdan Timofte
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// Interface updated 2026-05-14 — see AGENTS.md
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// TypeCount.recordArchiveData is stored with SwiftData external storage.
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// The archive remains a complete per-record forensic snapshot, but large blobs should
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// not be kept inline with the TypeCount row because high-volume HealthKit stores can
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// exceed device memory during import or detail inspection.
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// Initial high-volume imports stream records directly into a compact binary archive
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// instead of building a full in-memory dictionary/array; plist archives remain readable
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// for backwards compatibility.
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Bogdan Timofte
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// Interface updated 2026-05-17 — see AGENTS.md
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// Models/TypeCount.detailCacheData stores precomputed detail data for the current
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// TypeCount compared with the immediately previous snapshot on the same device.
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// The cache contains aggregate added/disappeared counts, capped preview records for
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// UI drill-down, and daily change bins for temporal charts. It must be computed when
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// snapshots are saved and refreshed for neighboring snapshots when snapshot deletion
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// changes chain links. Existing stores are backfilled incrementally with a strict
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// per-launch TypeCount cap to avoid decoding many large archives in one run.
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Bogdan Timofte
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a month ago
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// Models/DetectedAnomaly.swift
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enum AnomalyType: String, Codable {
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case historicalInsertion = "historical_insertion"
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case silentDeletion = "silent_deletion"
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case duplicate = "duplicate"
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case divergence = "divergence"
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}
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enum Severity: String, Codable, Comparable {
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case info, warning, critical
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}
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enum HealthStatus: String {
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case healthy, warning, critical, unknown
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}
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```
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Any model changes must be announced in this file before other agents consume them.
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---
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## Handoff Process
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When a module is ready to be consumed by another agent:
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1. **Define the protocol** in `Services/Protocols/` (services agent)
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2. **Implement a mock** in `Utilities/Mocks.swift` (Claude Code)
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3. **Build UI against the mock** (Claude Code)
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4. **Replace mock with real implementation** (services agent)
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5. **Integration test** (tests agent)
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This allows UI development and service development to proceed in parallel.
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---
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## Algorithms & Detection Logic
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The following modules involve non-trivial logic and should be reviewed carefully:
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| Module | File | Description |
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| **Anomaly Detector** | `Services/AnomalyDetector.swift` | Statistical detection: insertions, deletions, duplicates, divergence |
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| **Divergence Engine** | `Services/DivergenceEngine.swift` | Time-series trend analysis, σ comparison |
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| **Fingerprinter** | `Services/SampleFingerprinter.swift` | Duplicate detection via sample hashing |
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| **Snapshot Comparator** | `Services/SnapshotComparator.swift` | Diff between two HealthKit snapshots |
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| **Distribution Comparator** | `Services/SnapshotDiffService.swift` | Daily per-type distribution diff to reveal old-data disappearance masked by new data |
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**Guidelines for algorithm modules:**
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- Document assumptions explicitly (e.g., "assumes continuous monitoring since install")
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- All thresholds (e.g., `age > 7 days`) must be configurable constants, not magic numbers
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- Include unit tests for edge cases (empty snapshots, partial data, clock skew)
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- No UI code; return plain Swift types only
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---
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## Privacy Directives — All Agents
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**Mandatory across all modules:**
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- No credentials, API keys, tokens, or certificates in any file
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- No personal data: names, emails, phone numbers, dates of birth
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- No device identifiers: UDID, serial number, advertising ID, device name
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- No account identifiers: Apple ID, iCloud account info, CloudKit record IDs
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- No raw health values in code, tests, previews, logs, or comments
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- No location data or patterns enabling re-identification
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- Synthetic data only in tests and previews
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---
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## Communication Between Agents
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When one agent needs to communicate a decision or change to another:
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1. **Update this file** (`AGENTS.md`) with the protocol/interface change
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2. **Update the relevant protocol** in `Services/Protocols/`
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3. **Add a comment** in the affected file: `// Interface updated YYYY-MM-DD — see AGENTS.md`
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---
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## Current Status
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| Module | Status | Owner |
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| SwiftData Models | ✅ Done | Models agent |
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| HealthKit Integration | ✅ Done | Services agent |
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| Snapshot Diff Service | ✅ Done | Services agent |
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| Service Protocols | ⏳ Not started | Services agent |
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| Anomaly Detection | ⏳ Not started | Services agent |
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| Sync Monitor | ⏳ Not started | Services agent |
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| UI – App entry + TabView | ✅ Done | Claude Code |
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| UI – Dashboard | ✅ Done (functional, minimal) | Claude Code |
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| UI – Snapshots + Detail | ✅ Done | Claude Code |
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| UI – Data Types | ✅ Done | Claude Code |
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| UI – Settings | ✅ Done | Claude Code |
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| Unit Tests | ⏳ Not started | Tests agent |
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