Architecture review

Architecture Review (System Level)

Audit structural health: boundaries, dependency direction, layering, ADR drift. Report findings — never modify code.

Scope

In scope: module/context boundaries, dependency cycles, layer violations, namespace cohesion, public-API surface leaks, shared-model pollution, drift from documented ADRs.

Out of scope: SOLID inside a class, naming of private methods, style, line-level bugs (→ component-review or general code review).

Examples

# Review architecture of a specific PR
/architecture-review pr 42

# Review a branch against main
/architecture-review branch feat/orders-refactor

# Focus on a single namespace/module
/architecture-review namespace src/Order

# Review the whole project
/architecture-review

Workflow

flowchart TD
  A["Parse target mode"] --> B["Load project context"]
  B --> C["Collect files in scope"]
  C --> D["Build dependency map"]
  D --> E["Run checks"]
  E --> F["Report findings"]

Phase 1: Parse Target

From $ARGUMENTS:

• pr <N> → gh pr diff <N>, gh pr view <N> --json headRefName,files, read full file context via git show <branch>:<file>
• branch <name> → git diff main...<name>, git ls-tree -r <name>, read files via git show <branch>:<file>
• namespace <path> → recursively read files under <path>
• empty → full-project review (sample entry points + top-level modules)

Phase 2: Load Project Context

Check in order:

1. .agent-context/layer1-bootstrap.md, layer2-project-core.md
2. .agent-context/decisions.json → ADRs that define intended structure
3. docs/architecture/**/*.md
4. CLAUDE.md, AGENTS.md, CONTRIBUTING.md
5. Manifest files for stack detection

Never block on missing context — infer from code layout.

Phase 3: Build Dependency Map

Per detected stack, extract imports/uses:

• PHP/Symfony/Shopware → use statements, PSR-4 namespaces from composer.json
• TypeScript/JavaScript/Vue/Nuxt → import statements, path aliases from tsconfig.json/nuxt.config
• Go → import blocks, module path from go.mod
• Java/Kotlin → import + package declarations
• Python → import/from, top-level packages

Group imports by top-level module/namespace. Flag:

• Imports that cross declared module boundaries
• Imports going "upward" in a layered architecture
• Imports into another module's internal/private sub-path

Phase 4: Architectural Checks

Run each relevant check and record findings with file:line:

1. Dependency Direction

• Layered: higher layers may import lower, never the reverse
• Hexagonal: adapters → ports → domain (never domain → adapters)
• Modular: module A imports only B's public API, never internal/

2. Circular Dependencies

• Build a module-level graph, detect cycles
• Even acceptable cycles should be listed as risks

3. Boundary Cohesion

• Does each module have a single clear responsibility?
• Public API surface: how many files/classes does an outside caller touch?
• "God module" symptom: one module imported by almost everything

4. Shared Model Pollution

• Domain entities reused across bounded contexts without translation
• Shared "Common" / "Util" module growing unbounded

5. ADR Drift

• For each ADR in decisions.json or docs/architecture/adr/: does the current code still match?
• Flag the specific ADR ID and the divergent file

6. Framework Convention Drift

• Use WebFetch / Context7 for current-version best practices when the stack version matters
• Example: Nuxt 3 server/client boundary, Symfony bundle structure, Go internal/

7. Cross-Cutting Concerns

• Is auth enforced at a single seam or scattered?
• Is logging/observability concentrated or repeated ad-hoc?

Phase 5: Report

Output in the user's language. Structure:

## Architecture Review — <scope>

**Risk Level:** LOW | MEDIUM | HIGH | CRITICAL

**Detected stack:** <stack>

**Checks run:** <list>

## Critical (must fix)

- **<Title>** — `path/to/file:line`
  - Problem: <what>
  - Why it matters: <impact>
  - Suggested direction: <high-level fix, not code>

## Warnings (should fix)

- ...

## Observations (worth knowing)

- ...

## ADR Compliance

| ADR                   | Status      | Notes                              |
| --------------------- | ----------- | ---------------------------------- |
| ADR-0003 Hexagonal    | ✅ ok       |                                    |
| ADR-0007 No shared DB | ⚠️ drifting | `OrderRepo` touches billing tables |

## Suggested Next Steps

1. ...
2. ...

Rules

• Read-only. Never modify source files. Findings are reports.
• Structural focus. If the only findings are code-quality issues, recommend component-review instead.
• Evidence-based. Every finding needs a concrete file:line reference.
• Prioritize. Not every boundary leak is critical — severity matters more than count.
• Fallback, don't block. Missing ADRs or context layers → infer intent from code layout.
• Ignore style. Linters and formatters own that territory.