<!-- START doctoc generated TOC please keep comment here to allow auto update -->
<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
**Table of Contents**

- [ggen Marketplace Production Architecture](#ggen-marketplace-production-architecture)
  - [Executive Summary](#executive-summary)
  - [Table of Contents](#table-of-contents)
  - [System Overview](#system-overview)
    - [Core Responsibilities](#core-responsibilities)
    - [Key Architectural Decisions](#key-architectural-decisions)
  - [Architecture Layers](#architecture-layers)
    - [Layer 1: CLI Interface (`ggen-cli`)](#layer-1-cli-interface-ggen-cli)
    - [Layer 2: Domain Logic (`ggen-domain/marketplace`)](#layer-2-domain-logic-ggen-domainmarketplace)
    - [Layer 3: Infrastructure (`ggen-marketplace`)](#layer-3-infrastructure-ggen-marketplace)
  - [Data Models](#data-models)
    - [1. Package Metadata (`PackageMetadata`)](#1-package-metadata-packagemetadata)
    - [2. Maturity Scoring (`MaturityAssessment`)](#2-maturity-scoring-maturityassessment)
    - [3. Search & Filter Types](#3-search--filter-types)
    - [4. Recommendation System](#4-recommendation-system)
    - [5. Validation & Quality Gates](#5-validation--quality-gates)
  - [Integration Patterns](#integration-patterns)
    - [Pattern 1: CLI → Domain → Infrastructure](#pattern-1-cli-%E2%86%92-domain-%E2%86%92-infrastructure)
    - [Pattern 2: Maturity Assessment Pipeline](#pattern-2-maturity-assessment-pipeline)
    - [Pattern 3: Registry Synchronization](#pattern-3-registry-synchronization)
  - [Test Data Fixtures](#test-data-fixtures)
    - [Mock Registry Structure](#mock-registry-structure)
    - [Sample Packages (5 Fixtures)](#sample-packages-5-fixtures)
      - [1. `agent-editor` (Enterprise - Score: 92)](#1-agent-editor-enterprise---score-92)
      - [2. `microservice-template` (Production - Score: 72)](#2-microservice-template-production---score-72)
      - [3. `cli-starter` (Beta - Score: 55)](#3-cli-starter-beta---score-55)
      - [4. `experimental-gql` (Experimental - Score: 35)](#4-experimental-gql-experimental---score-35)
      - [5. `healthcare-fhir` (Production - Score: 78)](#5-healthcare-fhir-production---score-78)
    - [Mock `index.json`](#mock-indexjson)
  - [Command Flows](#command-flows)
    - [1. `marketplace search`](#1-marketplace-search)
    - [2. `marketplace install`](#2-marketplace-install)
    - [3. `marketplace maturity`](#3-marketplace-maturity)
    - [4. `marketplace validate`](#4-marketplace-validate)
    - [5. `marketplace recommend`](#5-marketplace-recommend)
  - [Quality Attributes](#quality-attributes)
    - [1. Performance](#1-performance)
    - [2. Reliability](#2-reliability)
    - [3. Security](#3-security)
    - [4. Maintainability](#4-maintainability)
  - [Future Extensions](#future-extensions)
    - [Phase 2: Remote Registry Support](#phase-2-remote-registry-support)
    - [Phase 3: GraphQL API](#phase-3-graphql-api)
    - [Phase 4: Machine Learning Recommendations](#phase-4-machine-learning-recommendations)
  - [Appendix A: File Structure](#appendix-a-file-structure)
  - [Appendix B: Key Metrics Dashboard](#appendix-b-key-metrics-dashboard)

<!-- END doctoc generated TOC please keep comment here to allow auto update -->

# ggen Marketplace Production Architecture

**Version**: 1.0
**Date**: 2025-01-16
**Status**: Design Document

## Executive Summary

This document defines the production-ready architecture for the ggen marketplace system, providing a comprehensive framework for package discovery, quality assessment, and installation. The architecture emphasizes data-driven maturity scoring, clean separation of concerns, and integration with existing ggen infrastructure.

---

## Table of Contents

1. [System Overview](#system-overview)
2. [Architecture Layers](#architecture-layers)
3. [Data Models](#data-models)
4. [Integration Patterns](#integration-patterns)
5. [Test Data Fixtures](#test-data-fixtures)
6. [Command Flows](#command-flows)
7. [Quality Attributes](#quality-attributes)

---

## System Overview

### Core Responsibilities

The marketplace subsystem handles:

1. **Package Registry Management**: Centralized index of available template packages
2. **Maturity Assessment**: 6-dimension scoring system (100-point scale)
3. **Package Search & Discovery**: Multi-criteria filtering and recommendations
4. **Installation & Validation**: Dependency resolution and production readiness checks
5. **Quality Reporting**: Dashboards, exports, and improvement plans

### Key Architectural Decisions

| Decision | Rationale | Trade-offs |
|----------|-----------|------------|
| **Local-first registry** | Fast queries, offline support, deterministic behavior | Requires sync mechanism |
| **JSON-based index** | Human-readable, tooling support, git-friendly | Slower than binary formats |
| **Async I/O throughout** | Non-blocking operations for file/network access | Increased complexity |
| **Trait-based abstractions** | Pluggable implementations (local/remote) | More boilerplate code |
| **Maturity-driven recommendations** | Objective quality metrics reduce bad installs | Requires accurate data collection |

---

## Architecture Layers

### Layer 1: CLI Interface (`ggen-cli`)

**Responsibility**: User-facing commands and output formatting

```
┌─────────────────────────────────────────────┐
│         CLI Command Layer                   │
│  (clap-noun-verb pattern)                   │
├─────────────────────────────────────────────┤
│  ggen marketplace search                    │
│  ggen marketplace install                   │
│  ggen marketplace list                      │
│  ggen marketplace validate                  │
│  ggen marketplace maturity                  │
│  ggen marketplace dashboard                 │
│  ggen marketplace recommend                 │
│  ggen marketplace compare                   │
└─────────────────────────────────────────────┘
```

**Key Files**:
- `crates/ggen-cli/src/cmds/marketplace.rs`

**Responsibilities**:
- Parse command-line arguments using `#[verb]` macros
- Convert CLI inputs to domain `Input` types
- Execute domain layer functions via `execute_async_verb`
- Format domain `Output` types for human/JSON display
- Handle errors gracefully with user-friendly messages

---

### Layer 2: Domain Logic (`ggen-domain/marketplace`)

**Responsibility**: Business logic and orchestration

```
┌─────────────────────────────────────────────┐
│         Domain Layer                        │
│  (Pure business logic)                      │
├─────────────────────────────────────────────┤
│  Search Filters & Queries                   │
│  Maturity Assessment Logic                  │
│  Recommendation Engine                      │
│  Validation Workflows                       │
│  Bundle Management                          │
│  Production Readiness Checks                │
└─────────────────────────────────────────────┘
```

**Key Modules**:

```rust
ggen-domain/src/marketplace/
├── search.rs              // execute_search(SearchInput) -> SearchResult
├── install.rs             // execute_install(InstallInput) -> InstallResult
├── list.rs                // execute_list(ListInput) -> ListOutput
├── validate.rs            // validate_package() -> PackageValidation
├── publish.rs             // execute_publish() -> PublishOutput
├── recommender.rs         // generate_recommendations()
├── bundles.rs             // Bundle & sector management
├── guards.rs              // Quality guard checks
├── quality_autopilot.rs   // Improvement suggestions
├── production_readiness.rs // Production gates
└── types.rs               // Poka-yoke validated types
```

**Pattern**: Input → Domain Logic → Output

```rust
// Example: Search Command Flow
pub async fn execute_search(input: SearchInput) -> Result<Vec<SearchResult>> {
    // 1. Validate input (NonEmptyQuery type guarantees non-empty)
    let query = NonEmptyQuery::new(input.query)?;

    // 2. Load registry (from ggen-marketplace layer)
    let registry = Registry::new()?.load().await?;

    // 3. Apply filters (category, maturity level, tags)
    let packages = registry.search(&query)?
        .filter_by_category(input.category)
        .filter_by_min_maturity(input.min_maturity)
        .collect();

    // 4. Enrich with maturity scores
    let results = packages.into_iter()
        .map(|pkg| SearchResult {
            name: pkg.name,
            version: pkg.latest_version(),
            description: pkg.description,
            maturity_score: calculate_maturity(&pkg),
            downloads: pkg.downloads,
            stars: pkg.stars,
        })
        .collect();

    Ok(results)
}
```

---

### Layer 3: Infrastructure (`ggen-marketplace`)

**Responsibility**: Technical implementations (storage, indexing, crypto)

```
┌─────────────────────────────────────────────┐
│       Infrastructure Layer                  │
│  (Technical implementations)                │
├─────────────────────────────────────────────┤
│  Registry: LocalRegistry, RemoteRegistry    │
│  Storage: FilesystemStore, MemoryStore      │
│  Search: TantivySearchEngine                │
│  Crypto: Ed25519Verifier                    │
│  Maturity: MaturityEvaluator                │
└─────────────────────────────────────────────┘
```

**Key Traits**:

```rust
// Trait-based abstractions allow pluggable implementations
pub trait Registry {
    async fn search(&self, query: &Query) -> Result<Vec<Package>>;
    async fn get_package(&self, name: &str) -> Result<Option<Package>>;
    async fn install(&self, name: &str, version: &str) -> Result<PathBuf>;
}

pub trait PackageStore {
    async fn store(&self, package: &Package, content: &[u8]) -> Result<ContentId>;
    async fn retrieve(&self, id: &ContentId) -> Result<Vec<u8>>;
}

pub trait SearchEngine {
    async fn index(&mut self, packages: Vec<Package>) -> Result<()>;
    async fn search(&self, query: &str, filters: SearchFilters) -> Result<Vec<SearchResult>>;
}
```

---

## Data Models

### 1. Package Metadata (`PackageMetadata`)

**Source**: `registry/index.json`, `package.toml`

```rust
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PackageMetadata {
    // Core identification
    pub name: String,                    // e.g., "agent-editor"
    pub version: Vec<VersionMetadata>,   // All available versions
    pub description: String,

    // Discoverability
    pub category: Option<String>,        // "ai-agents", "microservices", etc.
    pub tags: Vec<String>,               // ["ai", "editor", "refactoring"]
    pub keywords: Vec<String>,           // For search indexing

    // Provenance
    pub author: Option<String>,
    pub repository: Option<String>,
    pub license: Option<String>,
    pub homepage: Option<String>,

    // 8020 Innovation Fields
    pub is_8020: bool,                   // Critical 20% bundle
    pub is_8020_certified: bool,         // Passed all guards
    pub dark_matter_reduction_target: Option<String>,
    pub sector: Option<String>,          // "observability", "paper", etc.
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct VersionMetadata {
    pub version: String,                 // e.g., "1.2.0"
    pub download_url: String,
    pub checksum: String,                // SHA-256 hash
    pub dependencies: Vec<Dependency>,
    pub published_at: String,            // RFC3339 timestamp
    pub size_bytes: u64,
}
```

### 2. Maturity Scoring (`MaturityAssessment`)

**Source**: Calculated from package metadata + file analysis

```rust
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct MaturityAssessment {
    pub package_id: String,
    pub package_name: String,
    pub assessed_at: DateTime<Utc>,

    // 6-Dimension Scoring (100 points total)
    pub documentation: DocumentationScore,   // 0-20 points
    pub testing: TestingScore,               // 0-20 points
    pub security: SecurityScore,             // 0-20 points
    pub performance: PerformanceScore,       // 0-15 points
    pub adoption: AdoptionScore,             // 0-15 points
    pub maintenance: MaintenanceScore,       // 0-10 points
}

// Maturity levels derived from total score (0-100)
pub enum MaturityLevel {
    Experimental,   // 0-40:  Not production-ready
    Beta,           // 41-60: Functional but incomplete
    Production,     // 61-80: Stable and reliable
    Enterprise,     // 81-100: Fully mature
}
```

**Dimension Breakdown**:

| Dimension | Max Points | Criteria |
|-----------|------------|----------|
| **Documentation** | 20 | README (5), API docs (5), Examples (5), Changelog (5) |
| **Testing** | 20 | Unit tests (8), Integration tests (6), E2E tests (4), Coverage % |
| **Security** | 20 | Vulnerability scan (10), Dependency audit (5), Safe code (5) |
| **Performance** | 15 | Benchmarks (8), Optimization (4), Determinism (3) |
| **Adoption** | 15 | Downloads (6), Citations (5), Community (4) |
| **Maintenance** | 10 | Release cadence (5), Responsiveness (3), Active maint. (2) |

### 3. Search & Filter Types

```rust
#[derive(Debug, Clone)]
pub struct SearchInput {
    pub query: String,                   // NonEmptyQuery (validated)
    pub limit: usize,                    // Max results (default: 10)
    pub category: Option<String>,        // Filter by category
    pub min_maturity: Option<String>,    // "production", "enterprise"
    pub tags: Vec<String>,               // Match any tag
    pub sort_by: Option<SortField>,      // Name, Score, Downloads
}

#[derive(Debug, Clone, Serialize)]
pub struct SearchResult {
    pub name: String,
    pub version: String,                 // Latest version
    pub description: String,
    pub maturity_score: u32,             // 0-100
    pub maturity_level: String,          // "production"
    pub downloads: u64,
    pub stars: u32,
    pub category: Option<String>,
}
```

### 4. Recommendation System

```rust
#[derive(Debug, Clone)]
pub struct RecommendationSet {
    pub use_case: String,                // "production", "research", "startup"
    pub priority: Option<String>,        // "security", "performance"
    pub min_score: u32,                  // Minimum maturity score
    pub recommendations: Vec<Recommendation>,
}

#[derive(Debug, Clone)]
pub struct Recommendation {
    pub rank: usize,
    pub package_id: String,
    pub package_name: String,
    pub maturity_level: MaturityLevel,
    pub total_score: u32,
    pub reason: String,                  // Why recommended
    pub best_for: Vec<String>,           // Use cases
}
```

### 5. Validation & Quality Gates

```rust
#[derive(Debug, Clone)]
pub struct PackageValidation {
    pub package_name: String,
    pub package_path: PathBuf,
    pub score: f64,                      // 0-100
    pub production_ready: bool,          // score >= 80
    pub checks: Vec<CheckResult>,        // Individual validation results
}

#[derive(Debug, Clone)]
pub struct CheckResult {
    pub name: String,                    // "has_readme", "test_coverage"
    pub passed: bool,
    pub message: String,
    pub severity: Severity,              // Error, Warning, Info
}

// Example checks:
// - has_readme: Ensure README.md exists
// - test_coverage: Check coverage >= 80%
// - no_unsafe: No unsafe blocks
// - dependency_audit: All deps scanned
// - has_changelog: CHANGELOG.md exists
```

---

## Integration Patterns

### Pattern 1: CLI → Domain → Infrastructure

**Example: `marketplace search` Command**

```
┌──────────────┐
│  User Input  │  ggen marketplace search --query "rust api" --min-maturity production
└──────┬───────┘
       │
       v
┌──────────────────────────────────────────────────────────┐
│  CLI Layer (marketplace.rs)                              │
│  - Parse arguments (query, min_maturity)                 │
│  - Create SearchInput { query, filters }                 │
│  - Call execute_async_verb(execute_search)               │
└──────┬───────────────────────────────────────────────────┘
       │
       v
┌──────────────────────────────────────────────────────────┐
│  Domain Layer (search.rs)                                │
│  - Validate NonEmptyQuery                                │
│  - Load Registry (via Infrastructure)                    │
│  - Apply filters (category, maturity, tags)              │
│  - Enrich results with maturity scores                   │
│  - Return Vec<SearchResult>                              │
└──────┬───────────────────────────────────────────────────┘
       │
       v
┌──────────────────────────────────────────────────────────┐
│  Infrastructure Layer (registry.rs)                      │
│  - Load index.json from ~/.ggen/registry/                │
│  - Query LRU cache for package metadata                  │
│  - Search via TantivySearchEngine                        │
│  - Return raw Package objects                            │
└──────┬───────────────────────────────────────────────────┘
       │
       v
┌──────────────┐
│  JSON Output │  { "packages": [...], "total": 5 }
└──────────────┘
```

### Pattern 2: Maturity Assessment Pipeline

```
Package Discovery
      │
      v
┌─────────────────────────────────────────┐
│  File Analysis                          │
│  - Scan package directory               │
│  - Check for README, tests/, docs/      │
│  - Parse package.toml metadata          │
│  - Count code files, examples           │
└─────────────┬───────────────────────────┘
              │
              v
┌─────────────────────────────────────────┐
│  Maturity Evaluator                     │
│  - evaluate_documentation()             │
│  - evaluate_testing()                   │
│  - evaluate_security()                  │
│  - evaluate_performance()               │
│  - evaluate_adoption()                  │
│  - evaluate_maintenance()               │
└─────────────┬───────────────────────────┘
              │
              v
┌─────────────────────────────────────────┐
│  Maturity Assessment                    │
│  - Total score: 0-100                   │
│  - Level: Experimental/Beta/Prod/Ent    │
│  - Dimension breakdowns                 │
│  - Feedback & next steps                │
└─────────────────────────────────────────┘
```

### Pattern 3: Registry Synchronization

```
┌──────────────────────────────────────────┐
│  Remote Registry (GitHub/CDN)            │
│  - Canonical source of truth             │
│  - index.json (all packages)             │
│  - Package archives (.tar.gz)            │
└─────────────┬────────────────────────────┘
              │
              │  HTTP GET
              v
┌──────────────────────────────────────────┐
│  Local Registry Cache                    │
│  ~/.ggen/registry/                       │
│  ├── index.json (synced copy)            │
│  └── packages/ (installed packages)      │
└──────────────────────────────────────────┘
```

**Sync Strategy**:
1. **On First Use**: Auto-download registry if missing
2. **Manual Sync**: `ggen marketplace sync` forces refresh
3. **TTL-Based**: Check last modified timestamp (e.g., daily)
4. **Incremental**: Only download updated packages

---

## Test Data Fixtures

### Mock Registry Structure

**Location**: `tests/fixtures/marketplace/`

```
tests/fixtures/marketplace/
├── registry/
│   └── index.json              # Mock registry index
└── packages/
    ├── agent-editor/
    │   ├── package.toml
    │   ├── README.md
    │   ├── src/
    │   └── tests/
    ├── microservice-template/
    │   ├── package.toml
    │   ├── README.md
    │   └── templates/
    └── cli-starter/
        ├── package.toml
        └── README.md
```

### Sample Packages (5 Fixtures)

#### 1. `agent-editor` (Enterprise - Score: 92)

```toml
# tests/fixtures/marketplace/packages/agent-editor/package.toml
[package]
name = "agent-editor"
version = "1.0.0"
description = "AI-powered code editor automation"
category = "ai-agents"
author = "ggen-team"
repository = "https://github.com/seanchatmangpt/ggen"
license = "MIT"

[package.metadata]
production_ready = true
test_coverage = "95%"
documentation_score = 20
testing_score = 18
security_score = 19
performance_score = 14
adoption_score = 12
maintenance_score = 9

[package.features]
features = [
    "Multi-language support",
    "Semantic code understanding",
    "Intelligent refactoring",
]

[package.maturity]
level = "enterprise"
total_score = 92
```

#### 2. `microservice-template` (Production - Score: 72)

```toml
[package]
name = "microservice-template"
version = "2.1.0"
description = "Production-ready Rust microservice template"
category = "microservices"

[package.metadata]
production_ready = true
test_coverage = "82%"
documentation_score = 18
testing_score = 16
security_score = 18
performance_score = 10
adoption_score = 7
maintenance_score = 3

[package.maturity]
level = "production"
total_score = 72
```

#### 3. `cli-starter` (Beta - Score: 55)

```toml
[package]
name = "cli-starter"
version = "0.5.0"
description = "Basic CLI application template"
category = "cli-tools"

[package.metadata]
production_ready = false
test_coverage = "60%"
documentation_score = 12
testing_score = 10
security_score = 15
performance_score = 6
adoption_score = 8
maintenance_score = 4

[package.maturity]
level = "beta"
total_score = 55
```

#### 4. `experimental-gql` (Experimental - Score: 35)

```toml
[package]
name = "experimental-gql"
version = "0.1.0"
description = "Experimental GraphQL API generator"
category = "api"

[package.metadata]
production_ready = false
test_coverage = "25%"
documentation_score = 5
testing_score = 4
security_score = 8
performance_score = 3
adoption_score = 10
maintenance_score = 5

[package.maturity]
level = "experimental"
total_score = 35
```

#### 5. `healthcare-fhir` (Production - Score: 78)

```toml
[package]
name = "healthcare-fhir"
version = "1.5.0"
description = "FHIR-compliant healthcare integration"
category = "healthcare"
sector = "healthcare"

[package.metadata]
production_ready = true
test_coverage = "88%"
documentation_score = 19
testing_score = 17
security_score = 20
performance_score = 12
adoption_score = 6
maintenance_score = 4

[package.maturity]
level = "production"
total_score = 78
```

### Mock `index.json`

```json
{
  "version": "1.0.0",
  "updated_at": "2025-01-16T00:00:00Z",
  "packages": {
    "agent-editor": {
      "name": "agent-editor",
      "versions": [
        {
          "version": "1.0.0",
          "download_url": "https://example.com/packages/agent-editor-1.0.0.tar.gz",
          "checksum": "abc123...",
          "dependencies": [],
          "published_at": "2025-01-15T00:00:00Z",
          "size_bytes": 102400
        }
      ],
      "description": "AI-powered code editor automation",
      "author": "ggen-team",
      "category": "ai-agents",
      "tags": ["ai", "editor", "refactoring"],
      "repository": "https://github.com/seanchatmangpt/ggen",
      "license": "MIT",
      "homepage": "https://ggen.io",
      "is_8020": true,
      "is_8020_certified": true,
      "sector": "ai-agents"
    },
    "microservice-template": {
      "name": "microservice-template",
      "versions": [
        {
          "version": "2.1.0",
          "download_url": "https://example.com/packages/microservice-template-2.1.0.tar.gz",
          "checksum": "def456...",
          "dependencies": [],
          "published_at": "2025-01-10T00:00:00Z",
          "size_bytes": 204800
        }
      ],
      "description": "Production-ready Rust microservice template",
      "category": "microservices",
      "tags": ["microservice", "rust", "production"],
      "is_8020": true,
      "sector": "microservices"
    }
  }
}
```

---

## Command Flows

### 1. `marketplace search`

```
User: ggen marketplace search --query "healthcare" --min-maturity production

Flow:
1. CLI parses: query="healthcare", min_maturity="production"
2. Domain creates SearchInput { query, min_maturity: Some("production") }
3. Domain loads Registry from ~/.ggen/registry/index.json
4. Domain filters packages:
   - Match query against name/description/tags
   - Filter by maturity >= 61 (production threshold)
5. Domain enriches results with maturity scores
6. CLI formats output:
   {
     "packages": [
       {
         "name": "healthcare-fhir",
         "version": "1.5.0",
         "description": "FHIR-compliant healthcare integration",
         "maturity_score": 78,
         "maturity_level": "production",
         "downloads": 1250,
         "stars": 45
       }
     ],
     "total": 1
   }
```

### 2. `marketplace install`

```
User: ggen marketplace install microservice-template

Flow:
1. CLI parses: package="microservice-template"
2. Domain creates InstallInput { package, target: None, force: false }
3. Domain loads Registry, resolves latest version
4. Domain validates:
   - Package exists in registry
   - Maturity score >= 60 (configurable threshold)
   - No security vulnerabilities
5. Domain downloads package from download_url
6. Domain verifies checksum (SHA-256)
7. Domain extracts to ~/.ggen/packages/microservice-template/
8. Domain resolves and installs dependencies recursively
9. CLI outputs:
   {
     "package": "microservice-template",
     "version": "2.1.0",
     "path": "~/.ggen/packages/microservice-template",
     "dependencies": []
   }
```

### 3. `marketplace maturity`

```
User: ggen marketplace maturity agent-editor

Flow:
1. CLI parses: package_id="agent-editor"
2. Domain creates EvaluationInput from package metadata
3. Domain calls MaturityEvaluator::evaluate()
   - Scans package directory for files
   - Analyzes package.toml metadata
   - Calculates 6-dimension scores
4. Domain returns MaturityAssessment
5. CLI outputs:
   {
     "package_id": "agent-editor",
     "total_score": 92,
     "maturity_level": "enterprise",
     "scores": {
       "documentation": 20,
       "testing": 18,
       "security": 19,
       "performance": 14,
       "adoption": 12,
       "maintenance": 9
     },
     "feedback": [],
     "next_steps": [
       "Maintain comprehensive documentation",
       "Sustain test coverage above 90%"
     ]
   }
```

### 4. `marketplace validate`

```
User: ggen marketplace validate --package healthcare-fhir --require-level production

Flow:
1. CLI parses: package="healthcare-fhir", require_level="production"
2. Domain loads package from marketplace/packages/healthcare-fhir/
3. Domain runs validation checks:
   - README exists: PASS
   - API docs exist: PASS
   - Test coverage >= 80%: PASS (88%)
   - No security vulnerabilities: PASS
   - Benchmarks present: PASS
4. Domain calculates maturity score: 78
5. Domain checks: 78 >= 61 (production threshold) → PASS
6. CLI outputs:
   {
     "package": "healthcare-fhir",
     "score": 78.0,
     "production_ready": true,
     "total_packages": 1,
     "ready_count": 1,
     "needs_improvement_count": 0,
     "not_ready_count": 0,
     "details": { ... }
   }
```

### 5. `marketplace recommend`

```
User: ggen marketplace recommend --use-case production --priority security

Flow:
1. CLI parses: use_case="production", priority="security"
2. Domain generates all MaturityAssessments
3. Domain filters:
   - Min score >= 65 (production use case)
   - Security dimension >= 15 (high priority)
4. Domain sorts by total_score descending
5. CLI outputs:
   {
     "title": "Production-Ready Recommendations",
     "use_case": "production",
     "priority": "security",
     "total_matches": 3,
     "recommendations": [
       {
         "rank": 1,
         "package_id": "agent-editor",
         "maturity_level": "Enterprise",
         "total_score": 92,
         "reason": "Score: 92 - Fully mature, recommended for mission-critical systems"
       },
       {
         "rank": 2,
         "package_id": "healthcare-fhir",
         "maturity_level": "Production",
         "total_score": 78,
         "reason": "Score: 78 - Stable and reliable, suitable for production use"
       }
     ]
   }
```

---

## Quality Attributes

### 1. Performance

| Metric | Target | Measurement |
|--------|--------|-------------|
| **Registry load time** | < 100ms | Time to parse index.json from disk |
| **Search latency** | < 50ms | Time to filter 1000 packages |
| **Install time** | < 5s | Download + extract 10MB package |
| **Maturity assessment** | < 200ms | Evaluate 1 package across 6 dimensions |

**Optimization Strategies**:
- LRU cache for package metadata (100-entry capacity)
- Lazy loading of package details (only on demand)
- Async I/O for all file operations
- Tantivy search engine for large-scale indexing

### 2. Reliability

| Aspect | Strategy | Implementation |
|--------|----------|----------------|
| **Data integrity** | Checksums on all packages | SHA-256 verification before extraction |
| **Crash recovery** | Atomic file operations | Write to .tmp, then rename |
| **Validation** | Fail-fast on errors | Strict registry validation (no silent degradation) |
| **Idempotency** | Safe to retry | Install checks if package already exists |

### 3. Security

| Threat | Mitigation | Location |
|--------|-----------|----------|
| **Path traversal** | Validated package names | `types.rs::ValidatedPackageName` |
| **Dependency confusion** | Explicit version pinning | `registry.rs::Dependency` |
| **Malicious packages** | Ed25519 signature verification | `crypto::Ed25519Verifier` |
| **Unsafe code** | Static analysis checks | `maturity::SecurityScore::safe_code` |

### 4. Maintainability

**Design Principles**:
1. **Separation of Concerns**: CLI → Domain → Infrastructure layers
2. **Trait-Based Abstractions**: Pluggable Registry/Store/SearchEngine
3. **Type Safety**: Poka-yoke types prevent invalid states
4. **Testability**: Domain logic is pure (no I/O side effects)
5. **Documentation**: Comprehensive ADRs and inline comments

---

## Future Extensions

### Phase 2: Remote Registry Support

```rust
pub struct RemoteRegistry {
    base_url: Url,
    client: reqwest::Client,
    cache: LocalRegistry,
}

impl Registry for RemoteRegistry {
    async fn search(&self, query: &Query) -> Result<Vec<Package>> {
        // Fetch from remote API
        let response = self.client
            .get(format!("{}/api/search", self.base_url))
            .query(&[("q", query.as_str())])
            .send()
            .await?;

        // Cache results locally
        let packages = response.json::<Vec<Package>>().await?;
        self.cache.store_batch(&packages).await?;

        Ok(packages)
    }
}
```

### Phase 3: GraphQL API

```graphql
type Package {
  name: String!
  version: String!
  description: String!
  maturityScore: Int!
  maturityLevel: MaturityLevel!
  downloads: Int!
  category: String
  tags: [String!]!
}

enum MaturityLevel {
  EXPERIMENTAL
  BETA
  PRODUCTION
  ENTERPRISE
}

type Query {
  searchPackages(
    query: String!
    category: String
    minMaturity: MaturityLevel
    limit: Int = 10
  ): [Package!]!

  getPackage(name: String!, version: String): Package

  recommendPackages(
    useCase: String!
    priority: String
    minScore: Int
  ): [Recommendation!]!
}
```

### Phase 4: Machine Learning Recommendations

- **Collaborative Filtering**: "Users who installed X also installed Y"
- **Content-Based**: Match package features to user requirements
- **Hybrid Approach**: Combine maturity scores with usage patterns

---

## Appendix A: File Structure

```
ggen/
├── crates/
│   ├── ggen-cli/
│   │   └── src/cmds/marketplace.rs         # CLI commands
│   ├── ggen-domain/
│   │   └── src/marketplace/
│   │       ├── search.rs                   # Search logic
│   │       ├── install.rs                  # Installation logic
│   │       ├── list.rs                     # Package listing
│   │       ├── validate.rs                 # Validation logic
│   │       ├── recommender.rs              # Recommendation engine
│   │       ├── bundles.rs                  # Bundle management
│   │       ├── guards.rs                   # Quality guards
│   │       └── types.rs                    # Validated types
│   └── ggen-marketplace/
│       └── src/
│           ├── registry.rs                 # Registry implementation
│           ├── maturity.rs                 # Maturity scoring
│           ├── maturity_evaluator.rs       # Evaluation logic
│           ├── backend/                    # LocalRegistry, etc.
│           ├── search/                     # TantivySearchEngine
│           └── crypto/                     # Signature verification
├── marketplace/
│   ├── registry/
│   │   └── index.json                      # Package index
│   └── packages/
│       ├── agent-editor/                   # Package directories
│       ├── microservice-template/
│       └── cli-starter/
└── tests/
    └── fixtures/
        └── marketplace/                     # Test data
```

## Appendix B: Key Metrics Dashboard

```
┌────────────────────────────────────────────────────────────┐
│  ggen Marketplace Health Dashboard                         │
├────────────────────────────────────────────────────────────┤
│  Total Packages:              68                           │
│  Average Maturity Score:      67.5                         │
│                                                            │
│  Level Distribution:                                       │
│    Enterprise (81-100):       8  (12%)  ████               │
│    Production (61-80):        32 (47%)  ████████████████   │
│    Beta (41-60):              18 (26%)  ████████           │
│    Experimental (0-40):       10 (15%)  ████               │
│                                                            │
│  Average Dimension Scores:                                 │
│    Documentation:             14.2 / 20  (71%)             │
│    Testing:                   13.1 / 20  (66%)             │
│    Security:                  15.8 / 20  (79%)             │
│    Performance:               9.5  / 15  (63%)             │
│    Adoption:                  8.7  / 15  (58%)             │
│    Maintenance:               6.2  / 10  (62%)             │
└────────────────────────────────────────────────────────────┘
```

---

**End of Architecture Document**
