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AGENTS

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 Android SDK engineer specializing in customer data platform (CDP) SDK development.

  • Treat this as a public SDK (multi-module Gradle library published to Maven Central), not a full consumer app.
  • Prioritize: API stability, minimal footprint (APK size impact), no unnecessary allocations, thread-safety, backward compatibility (minSdk 14+), privacy compliance.
  • The SDK handles event tracking, identity management, consent, commerce events, and integration kit orchestration.
  • Avoid proposing big refactors unless explicitly asked; prefer additive changes + deprecations.

Quick Start for Agents

  • Use latest Android Studio + JDK 17.
  • Run all commands with ./gradlew (wrapper).
  • Primary tasks:
    • Build: ./gradlew build
    • Run unit tests: ./gradlew test
    • Lint: trunk check (primary), ./gradlew ktlintCheck, ./gradlew lint
    • Instrumented tests: ./gradlew connectedAndroidTest (requires emulator, API 28)
    • Isolated kit tests: cd kits/urbanairship-kit && ./gradlew testRelease (for kits excluded from settings-kits.gradle due to Kotlin version)
  • 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.
  • Use Kotlin idioms: data classes, sealed classes, value classes for immutability.
  • Keep public API surface additive; deprecate instead of remove (use @Deprecated).
  • Mark public APIs with thorough KDoc (/** ... */).
  • Dispatch work safely off the main thread.
  • Measure & report APK/size impact before proposing dependency or code changes.
  • Run trunk check and unit tests before any commit.

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/), release scripts (scripts/), or CI YAML without explicit request.
  • Propose raising minSdk beyond current (API 14+).
  • Break kit/integration compatibility without explicit coordination.
  • Modify ProGuard rules without verifying impact on consumer apps.

When to Ask for Clarification

  • Before adding any new dependency.
  • Before dropping support for API levels.
  • 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 Android SDK (Rokt fork): a multi-module Gradle library for customer data platform functionality on Android.
  • Handles event tracking, user identity management, consent management, commerce events, and integration kit orchestration.
  • Published to Maven Central.
  • Integration kits (like the Rokt kit) plug into this SDK to forward events to third-party services.

Key paths

  • android-core/ — Core SDK library (Java + Kotlin source).
  • android-kit-base/ — Base classes for kit implementations.
  • kits/ — Integration kit implementations.
  • kit-plugin/ — Gradle plugin for kit development.
  • tooling/ — Build tools and utilities.
  • testutils/ — Shared testing infrastructure.
  • scripts/ — Build, release, and CI scripts.
    • release.sh — Release automation.
    • maven.gradle — Maven Central publishing config.
    • install-start-emulator.sh — Emulator setup for CI.
    • startup_perf_tests.sh — Performance testing.
  • .editorconfig — Code style configuration (max line length 150, Kotlin style rules).
  • android-core/lint-baseline.xml — Lint baseline.
  • android-core/proguard.pro — ProGuard rules.
  • android-core/consumer-proguard.pro — Consumer ProGuard rules.
  • CHANGELOG.md — Release notes (extensive).
  • RELEASE.md — Release process documentation.
  • settings-kits.gradle — Kit inclusion list (some kits excluded for Kotlin version; see comments).
  • CONTRIBUTING.md — Contribution guidelines.
  • ONBOARDING.md — Onboarding guide.

Code style, quality, and validation

  • Lint & format tools:

    • ktlint: v13.0.0 (configured via .editorconfig with intellij_idea code style, max line 150).
    • Android Lint: with baseline file.
    • SonarQube: v3.5.0 (sonarcloud.io analysis).
    • Primary enforcement tool: trunk check (via Trunk.io). If Trunk unavailable, fall back to ./gradlew ktlintCheck lint.
    • 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: ./gradlew build.
    3. Run unit tests: ./gradlew test.
    4. ./gradlew ktlintCheck — Kotlin lint verification.
    5. If change affects core SDK: run instrumented tests with emulator (API 28).
    6. If change affects code, assets, or dependencies: confirm no unacceptable size increase.
    • 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:

    • Prefer val over var; use immutable data structures (data class, List, Map).
    • Use coroutines for async code where appropriate.
    • Write thorough KDoc for all public APIs.
    • Avoid !! force-unwraps; prefer safe calls/elvis/let.
    • Follow .editorconfig rules: max line 150, trailing comma on call/declaration sites.
    • Use @JvmStatic, @JvmOverloads for Java interop where needed.

  • Testing expectations:

    • Unit tests in android-core/src/test/ (JUnit 4, Mockito 2.0.2, PowerMock 2.0.7).
    • Instrumented tests in android-core/src/androidTest/ (API 28 emulator, optional orchestrator via -Porchestrator).
    • When adding or updating tests follow the AAA pattern (Arrange-Act-Assert).
    • 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

  • PR checks include: Trunk checks, hardcoded secrets detection, branch name validation, PR title semantic checks, unit tests, instrumented tests, code coverage, and SonarQube analysis.

External Resources