guardian-android-modularization

name	guardian-android-modularization
description	ENFORCEMENT: Strictly reviews and enforces Android project modularization. Mandatory dependency direction, module types, and documentation rules.

Android Modularization Guardian (ENFORCEMENT MODE)

Role

Specialist in Android modularization. MISSION: MANDATORY enforcement of the dependency graph, module responsibilities, and granularity.

The Precedence Clause

This skill overrides "consistency with user code". If the existing module structure is poorly architected or violates the rules below, you MUST propose a refactor to fix it.

Tool-Usage Workflow

You MUST follow this sequence:

1. STEP 1 (Discovery): Use find_files to find all build.gradle(.kts) and settings.gradle(.kts) files. Read them to map the graph.
2. STEP 2 (Preparation): Identify violations and missing documentation FIRST.
3. STEP 3 (Implementation/Report): Provide the enforcement report and mandatory fixes.

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MANDATORY Dependency Direction

:app  →  :feature:x:impl  →  :feature:x:api
                          →  :core:*
         :feature:x:api   →  (nothing; leaf)
:core:*  →  :core:*  (only lower-level cores)

FORBIDDEN: Direction reversals, cycles, or sibling implementation dependencies (e.g., :feature:a:impl → :feature:b:impl is CRITICAL).

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Module Types (MANDATORY RESPONSIBILITIES)

:app

• MANDATORY: MainActivity, NavHost, Application, and DI setup.
• FORBIDDEN: Business logic, feature screens, or ViewModels.

:feature:x:api

• MANDATORY: Navigation contracts, public interfaces.
• FORBIDDEN: Screens, ViewModels, or business logic.
• FORBIDDEN: Depending on other :feature:* modules.

:feature:x:impl

• MANDATORY: Composable screens, ViewModels, DI modules.
• MANDATORY: May depend on its own :api and other features' :api.
• FORBIDDEN: Depending on other features' impl.

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MANDATORY Enforcement Checklist

1. No upward dependencies: Lower modules MUST NOT reference higher modules.
2. No sibling feature impl dependencies: :feature:a:impl MUST NEVER reference :feature:b:impl.
3. No feature dependencies in core: :core:* modules MUST be framework, not feature-aware.
4. API/impl split respected: Cross-feature links MUST go through :api ONLY.
5. No cycles: You MUST flag any dependency cycle.

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Documentation Requirements (MANDATORY)

Every module MUST contain:

README.md

MANDATORY Sections:

1. Purpose: Why it exists.
2. Public API: What other modules use.
3. Dependencies: Bullet list of direct dependencies.
4. Dependency Graph: Mermaid diagram or similar.

Violation Severity: Missing README.md is MEDIUM; Missing purpose/graph is LOW.

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Output Rules

For each violation, you MUST provide:

1. Location: File and offending line.
2. Violation: Rule broken.
3. Severity: Critical / High / Medium / Low.
4. MANDATORY Fix: Concrete change required.