AI architecture review: Architecture Review: Draw the Box Diagram First

Day 91: Architecture Review: Draw the Box Diagram First
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This guide focuses on AI architecture review for production systems, with practical trade-offs for reliability, security, and cost. No model until the boxes exist. Architecture review for AI features starts with data flow, trust boundaries, and SLOs on a whiteboard — not with a Bedrock model id in a ticket.
⚡ TL;DR: Draw producers → stores → gateway → model → tools → users. Mark trust boundaries and PII. Write SLOs before prompt drafts. Reject designs that skip the diagram.

AI architecture review: production guidance

text
[User] → [Product API] → [AI Gateway] → [Model]
                │              │
                │              ├→ [RAG index]
                │              └→ [Tools / twin]
                └→ [Audit log]
Question Fail if unanswered
Where does PII flow? —
What can tools mutate? —
What’s the rollback? —
What’s the faithfulness SLO? —
Who owns eval? —
markdown
## ADR stub
### Context
### Data flow (link diagram)
### Trust boundaries
### SLOs
### Model/tool choices (after the above)
### Risks
❌ Starting the ADR with “We will use Claude Sonnet” before tools and tenants are drawn.

Failure modes

Diagrams that omit the logging pipeline (where prompts land). If logs leave the trust boundary, that is a feature surface. Also omit “batch eval jobs” that share prod indexes — draw them.

Closing checklist

  • [ ] Diagram reviewed by security + platform
  • [ ] Trust boundaries labeled
  • [ ] SLOs drafted (Day 93)
  • [ ] Twin/dry-run called out (Day 88)
  • [ ] Model choice is last, not first

Series navigation

Day 90: Project: Incident Timeline Summarizer · Day 92: Threat Model an AI Feature Last updated September 11, 2026 Related: AI-Powered Code Review: Catch Security Issues and Architecture Violations Automatically; Day 58: Spec-First: OpenAPI Remains Source of Truth; Day 2: Transformer Attention as a Systems Diagram.

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