Architecture

Architecture analysis with pattern validation and dependency checking.

When to Use

• Architecture compliance verification
• Dependency graph analysis
• Pattern validation (Hexagonal, Clean, Layered)
• Circular dependency detection
• Module boundary evaluation
• Architecture documentation generation

MCP Workflow

# 1. Project structure (high-level first)
serena.list_dir(relative_path=".", recursive=False)  # Top-level only
serena.list_dir(relative_path="src/", recursive=True, skip_ignored_files=True)

# 2. Module/layer overview (signatures only)
serena.get_symbols_overview(relative_path="src/domain/")
serena.get_symbols_overview(relative_path="src/application/")

# 3. Past architecture decisions
claude-mem.search(query="architecture decision", project="<project>")

# 4. Layer dependencies (targeted patterns)
serena.search_for_pattern("^import|^from", relative_path="src/domain/")

# 5. Framework patterns when needed
context7.get-library-docs("<framework>", topic="architecture")

Efficiency Rules

Do (Token-Efficient):

• Start with list_dir(recursive=False) for top-level structure
• Use get_symbols_overview per layer, not entire project
• Search patterns with relative_path to limit scope
• Check memory before re-analyzing

Avoid (Token-Wasteful):

• Reading entire files to understand structure
• Recursive scans without limiting scope
• Re-analyzing architecture already documented

Architecture Patterns

Hexagonal (Ports & Adapters)

Primary Adapters   <- Controllers, CLI
        |
    Application    <- Use Cases
        |
      Domain       <- Entities, Ports
        ^
Secondary Adapters <- Repositories, APIs

Rules: Domain NEVER depends on adapters. Ports in domain, adapters implement.

Layered

Presentation  -> Application -> Domain <- Infrastructure

Rules: Dependencies flow inward. Inner layers know nothing of outer.

Layer Validation

# Domain should NOT import Infrastructure
serena.search_for_pattern("import.*infra", relative_path="src/domain/")

# Domain should NOT import Presentation
serena.search_for_pattern("import.*api|from.*controller", relative_path="src/domain/")

Output Format

## Architecture: [Scope]

### Pattern: [Name]

| Layer | Status | Issues |
|-------|--------|--------|
| Domain | OK / VIOLATION | [details] |
| Application | OK / VIOLATION | [details] |
| Infrastructure | OK / VIOLATION | [details] |

### Violations
1. `file:line` - Domain imports Infrastructure
   - Impact: [description]
   - Fix: Create port interface

### Dependency Graph
```mermaid
graph TD
    API --> APP --> DOMAIN
    INFRA --> DOMAIN

Recommendations

1. [High] Fix layer violation
2. [Medium] Improve cohesion

## Layer Rules

| Layer | Contains | Depends On |
|-------|----------|------------|
| Presentation | Controllers, Views | Application |
| Application | Use Cases | Domain |
| Domain | Entities, Ports | Nothing (pure) |
| Infrastructure | Repositories | Domain (implements ports) |

## Anti-Patterns to Detect

- **God class**: Class doing too much
- **Circular dependency**: A -> B -> A
- **Layer leaking**: Infrastructure in domain
- **Entity exposure**: Domain objects in API
- **Tight coupling**: No abstraction between components

## ADR Template

```markdown
# ADR-001: [Title]

## Status
Proposed / Accepted / Deprecated

## Context
What issue motivates this decision?

## Decision
What change are we making?

## Consequences
What becomes easier or harder?

Architecture Diagram Templates

Component Diagram (C4 Style)

graph TB
    subgraph "System Boundary"
        subgraph "Presentation"
            UI[Web UI]
            CLI[CLI Tool]
        end
        subgraph "Application"
            API[API Server]
        end
        subgraph "Domain"
            SVC[Services]
        end
        subgraph "Infrastructure"
            REPO[Repositories]
            DB[(Database)]
        end
    end
    UI --> API
    CLI --> API
    API --> SVC
    SVC --> REPO
    REPO --> DB

Data Flow Diagram

flowchart LR
    A[Request] --> B{Validate}
    B -->|Valid| C[Process]
    B -->|Invalid| D[Error Response]
    C --> E[Persist]
    E --> F[Response]

Module Dependencies

graph TD
    API[module-server-api] --> APP[module-core-domain]
    API --> INFRA[module-core-infra]
    INFRA --> APP
    COMMON[module-core-common] --> APP

Documentation Workflow

When documenting architecture:

1. Gather - Use MCP workflow above
2. Diagram - Create Mermaid diagrams
3. Describe - Explain key decisions
4. Validate - Check against code