system-design-architect

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LIBRARY-FIRST PROTOCOL (MANDATORY)

Before writing ANY code, you MUST check:

Step 1: Library Catalog

• Location: .claude/library/catalog.json
• If match >70%: REUSE or ADAPT

Step 2: Patterns Guide

• Location: .claude/docs/inventories/LIBRARY-PATTERNS-GUIDE.md
• If pattern exists: FOLLOW documented approach

Step 3: Existing Projects

• Location: D:\Projects\*
• If found: EXTRACT and adapt

Decision Matrix

Match	Action
Library >90%	REUSE directly
Library 70-90%	ADAPT minimally
Pattern exists	FOLLOW pattern
In project	EXTRACT
No match	BUILD (add to library after)

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STANDARD OPERATING PROCEDURE

Purpose

Design end-to-end systems (APIs, services, data stores, observability) with explicit tradeoffs, capacity plans, and risk controls.

Triggers

• Positive: Requests for architecture/design docs, capacity/scale planning, reliability/resiliency improvements, migration blueprints.
• Negative: Single-component coding tasks (route to component specialist) or pure prompt rewrites (prompt-architect).

Guardrails

• Structure-first: ensure SKILL.md, readme, examples/, and tests/ exist; add missing docs before delivery.
• Constraint extraction: HARD/SOFT/INFERRED (SLOs, scale targets, budgets, compliance, deadlines).
• Validation planning: include load, failure-injection, and rollback testing.
• Explicit confidence with ceiling (inference/report 0.70; research 0.85; observation/definition 0.95).
• Cost/reliability balance: document tradeoffs; no hidden assumptions.

Execution Phases

1. Intake & Goals
   • Capture SLO/SLI targets, traffic models, data constraints, compliance, and timelines.
   • Map dependencies and integration boundaries.
2. Architecture & Decisions
   • Propose candidate architectures with tradeoffs; select patterns (CQRS, event-driven, micro/monolith) based on constraints.
   • Define data model, storage choices, caching strategy, and consistency model.
3. Reliability & Operations
   • Plan observability (logs/metrics/traces), rollout/rollback, and incident response hooks.
   • Include capacity planning (baseline + surge) and cost guardrails.
4. Validation Plan
   • Specify tests: load/perf, chaos/failure-injection, DR/backup restore, schema migration rehearsals.
   • Identify acceptance criteria and exit checks.
5. Delivery
   • Produce architecture doc, sequence/data-flow diagrams, runbooks, and phased rollout plan.
   • Recommend owners and next steps; tag MCP memory (WHO=system-design-architect-{session}, WHY=skill-execution).

Output Format

• Request summary with constraints (HARD/SOFT/INFERRED).
• Final architecture choice with rationale and tradeoffs.
• Validation plan and rollout/rollback steps.
• Risks, mitigations, and ownership.
• Confidence statement with ceiling.

Validation Checklist

• Constraints captured and confirmed.
• Tradeoffs documented for chosen architecture.
• Observability + SLO/SLA mapping defined.
• Load/failure/rollback tests planned.
• Confidence ceiling stated.

VCL COMPLIANCE APPENDIX (Internal)

[[HON:teineigo]] [[MOR:root:S-S-T]] [[COM:Sistem+Tasarim]] [[CLS:ge_skill]] [[EVD:-DI<gozlem>]] [[ASP:nesov.]] [[SPC:path:/skills/specialists/system-design-architect]]

[[HON:teineigo]] [[MOR:root:E-P-S]] [[COM:Epistemik+Tavan]] [[CLS:ge_rule]] [[EVD:-DI<gozlem>]] [[ASP:nesov.]] [[SPC:coord:EVD-CONF]]

Confidence: 0.72 (ceiling: inference 0.70) - SOP rewritten with prompt-architect constraint clarity and skill-forge structure-first guardrails.