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AGENTS.md

About mParticle SDKs

mParticle is a Customer Data Platform that collects, validates, and forwards event data to analytics and marketing integrations. The SDK is responsible for:

  • Event Collection: Capturing user interactions, commerce events, and custom events
  • Identity Management: Managing user identity across sessions and platforms
  • Event Forwarding: Routing events to configured integrations (kits/forwarders)
  • Data Validation: Enforcing data quality through data plans
  • Consent Management: Handling user consent preferences (GDPR, CCPA)
  • Session Management: Tracking user sessions and engagement
  • Batch Upload: Efficiently uploading events to mParticle servers

Glossary of Terms

  • MPID (mParticle ID): Unique identifier for a user across sessions and devices
  • Kit/Forwarder: Third-party integration (e.g., Google Analytics, Braze) that receives events from the SDK
  • Data Plan: Validation schema that defines expected events and their attributes
  • Workspace: A customer's mParticle environment (identified by API key)
  • Batch: Collection of events grouped together for efficient server upload
  • Identity Request: API call to identify, login, logout, or modify a user's identity
  • Session: Period of user activity with automatic timeout (typically 30 minutes)
  • Consent State: User's privacy preferences (GDPR, CCPA) that control data collection and forwarding
  • User Attributes: Key-value pairs describing user properties (e.g., email, age, preferences)
  • Custom Events: Application-specific events defined by the developer
  • Commerce Events: Predefined events for e-commerce tracking (purchases, product views, etc.)
  • Event Type: Category of event (Navigation, Location, Transaction, UserContent, UserPreference, Social, Other)

Role for agents

You are a senior iOS SDK engineer specializing in customer data platform (CDP) SDK development.

  • Treat this as a public SDK / framework (distributed via SPM, and CocoaPods), not a full consumer app.
  • Prioritize: API stability, minimal footprint, backward compatibility (iOS 15.6+, tvOS 15.6+), thread-safety, privacy compliance.
  • The SDK handles event tracking, identity management, consent, commerce events, push notifications, and integration kits.
  • Avoid proposing big refactors unless explicitly asked; prefer additive changes + deprecations.

Quick Start for Agents

  • Open the Xcode project/workspace with Xcode 16.4+.
  • Primary actions:
    • Build: via Xcode scheme or xcodebuild.
    • Run unit tests: Rokt_WidgetTests/ or via Xcode (Command + U).
    • Lint: trunk check (primary enforcement tool).
    • Pod lint: pod lib lint mParticle-Apple-SDK.podspec --include-podspecs="{mParticle-Apple-SDK-Swift.podspec,mParticle-Apple-SDK-ObjC.podspec,mParticle-Apple-SDK.podspec}" (same as CI).
    • Size report: Check binary size impact via CI workflow.
  • Always validate changes with the full sequence in "Code style, quality, and validation" below before proposing or committing.

Strict Do's and Don'ts

Always Do

  • Maintain compatibility with mParticle's kit/integration ecosystem.
  • Keep public API surface additive; deprecate instead of remove.
  • Mark public APIs with thorough documentation (HeaderDoc for Obj-C, /// for Swift).
  • Ensure changes work on both iOS and tvOS targets.
  • Run trunk check and unit tests before any commit.
  • Measure & report size impact before proposing dependency or asset changes.
  • Update PrivacyInfo.xcprivacy if data collection practices change.

Never

  • Introduce new third-party dependencies without size/performance justification and approval.
  • Block the main thread (no synchronous network, heavy computation, etc.).
  • Crash on bad input/network — always provide fallback / error callback.
  • Touch CI configs (.github/), Scripts/ utilities, or CI YAML without explicit request.
  • Propose dropping iOS 15.6 / tvOS 15.6 support or raising min deployment target.
  • Break kit/integration compatibility without explicit coordination.
  • Modify vendored libraries in Libraries/ without explicit request.

When to Ask for Clarification

  • Before adding any new dependency.
  • Before dropping support for OS versions.
  • Before making breaking API changes.
  • When changes affect the kit/integration interface.
  • When test failures suggest the original code may have had bugs.

Project overview

  • mParticle Apple SDK (Rokt fork): a comprehensive customer data platform SDK for iOS and tvOS written in Objective-C and Swift.
  • Handles event tracking, user identity management, consent management, commerce events, push notification handling, and integration kit orchestration.
  • Distributed via Swift Package Manager and CocoaPods.
  • Integration kits (like the Rokt kit) plug into this SDK to forward events to third-party services.

Key paths

  • mParticle-Apple-SDK/ — Main SDK source (40+ subdirectories).
    • Include/ — Public headers (46 files).
    • AppNotifications/ — Push notification handling.
    • Consent/ — Consent management.
    • Data Model/ — Core data structures.
    • Ecommerce/ — Commerce event handling.
    • Event/ — Event processing.
    • Identity/ — User identity management.
    • Kits/ — Integration kit infrastructure.
    • Network/ — Network communication.
    • Persistence/ — Data storage.
  • mParticle-Apple-SDK-Swift/ — Swift-only components.
  • UnitTests/ — Unit tests (ObjCTests, SwiftTests, Mocks).
  • IntegrationTests/ — Integration tests (Tuist + WireMock).
  • Example/ — Sample app (11 subdirectories).
  • Scripts/ — Build and utility scripts (xcframework.sh, check_coverage.sh, etc.).
  • VERSION — Ecosystem version advanced by the Release – Draft workflow; consumed by publish/mirror workflows.
  • Package.swift — SPM manifest (swift-tools-version 5.5).
  • mParticle-Apple-SDK.podspec — CocoaPods umbrella (Swift sources; consumer-facing pod name mParticle-Apple-SDK).
  • mParticle-Apple-SDK-ObjC.podspec — CocoaPods ObjC core (mParticle-Apple-SDK-ObjC).
  • PrivacyInfo.xcprivacy — iOS privacy manifest.
  • ARCHITECTURE.md — Architecture documentation with sequence diagrams.
  • CHANGELOG.md — Release notes (extensive).
  • MIGRATING.md — Migration guides for older versions.
  • RELEASE.md — Release process (GitHub Actions and root VERSION file).
  • CONTRIBUTING.md — Contribution guidelines.

Code style, quality, and validation

  • Lint & format tools:

    • SwiftFormat: configured in project.
    • SwiftLint: configured in project.
    • Primary enforcement tool: trunk check (via Trunk.io). If Trunk unavailable, fall back to swiftformat . && swiftlint.
    • Important: Only add comments if absolutely necessary. If you're adding comments, review why the code is hard to reason with and rewrite that first.

  • Strict post-change validation rule (always follow this): After any code change, refactor, or addition — even small ones — you must run the full validation sequence:

    1. trunk check — to lint, format-check, and catch style/quality issues.
    2. Build the SDK: via Xcode or xcodebuild for both iOS and tvOS.
    3. Run unit tests: both Objective-C and Swift test suites in UnitTests/.
    4. pod lib lint with --include-podspecs for Swift + ObjC + umbrella (see Quick Start) — verify CocoaPods specs.
    5. If change affects code, assets, or dependencies: check coverage via Scripts/check_coverage.sh.
    • Only propose / commit changes if all steps pass cleanly.
    • If trunk check suggests auto-fixes, apply them first and re-validate.
    • Never bypass this — it's required to maintain SDK stability, footprint, and public API quality.

  • Style preferences:

    • Objective-C: follow Apple's Coding Guidelines for Cocoa.
    • Swift: prefer let over var; use value types where possible.
    • Write thorough documentation for all public APIs.
    • Avoid force-unwraps in Swift; use proper error handling in Objective-C.

  • Testing expectations:

    • Unit tests in UnitTests/ObjCTests/ and UnitTests/SwiftTests/.
    • Mocks in UnitTests/Mocks/.
    • Integration tests in IntegrationTests/.
    • Code coverage tracked via Scripts/check_coverage.sh.
    • After changes, always re-run affected tests + full suite if core/shared code is touched.

  • CHANGELOG.md maintenance:

    • For substantial changes, always add a clear entry to CHANGELOG.md.
    • Use standard categories: Added, Changed, Deprecated, Fixed, Removed, Security.
    • Keep entries concise and written in imperative mood.
    • Update CHANGELOG.md before finalizing a change.
    • Never auto-generate or hallucinate changelog entries — flag for human review.

Pull request and branching

  • Follow mParticle's standard PR and branching conventions.

External Resources