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Nexus Architect

System architecture toolkit with 51 skills for legacy refactoring, greenfield design, database migration, and consulting deliverables using Claude Code.

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What it does

Nexus Architect is a comprehensive system architecture toolkit that provides 51 specialized skills across two plugin suites: architect (40 skills) and scalardb (11 skills). It guides you through complete architecture projects—from investigating existing systems to designing scalable solutions and generating implementation specifications.

How it works

Install as Claude Code plugins or use directly with Codex. Access skills via slash commands like /architect:start or /architect:pipeline. The toolkit orchestrates investigation, analysis, evaluation, design, code generation, infrastructure provisioning, and multi-perspective review phases. Each skill generates structured outputs: tech stack assessments, ER diagrams, Mermaid visualizations, Kubernetes manifests, and cost estimates.

Use cases

  • Legacy refactoring: Assess monolith tech debt, map domains using DDD, design bounded contexts, and plan phased migration
  • Greenfield projects: Design microservices architecture, database schemas, API contracts, and infrastructure from scratch
  • Database migration: Transform Oracle/MySQL/PostgreSQL systems to ScalarDB with schema analysis and code generation
  • Consulting deliverables: Generate comprehensive reports with architecture diagrams, security assessments, and disaster recovery plans
  • ScalarDB development: Interactive schema design, Spring Boot code generation, local Docker environments

Who benefits

Systems architects, engineering leads, and technical consultants who need systematic approaches to large-scale design problems. Product teams planning infrastructure overhauls. Organizations migrating to distributed databases or microservices.

Frequently asked questions

How do I install Nexus Architect?
Install as Claude Code plugins: `claude plugin install architect@nexus-architect --scope user` and `claude plugin install scalardb@nexus-architect --scope user`. Then use commands like `/architect:start ./path/to/target`. Alternatively, clone the repository and use with Codex via `AGENTS.md` compatibility rules.
What's the difference between architect and scalardb plugins?
The architect plugin (40 skills) handles system investigation, DDD analysis, microservices design, infrastructure, and security for any architecture. The scalardb plugin (11 skills) specializes in ScalarDB application development—schema design, code generation, configuration, error handling, and code review for distributed transactions.
Can I use Nexus Architect for legacy system refactoring?
Yes. Run `/architect:start ./path/to/target` to investigate tech stack, code structure, and technical debt. Then use `/architect:analyze` for domain mapping, `/architect:evaluate-ddd` for maturity assessment, and `/architect:redesign` to plan bounded context restructuring. Generate reports with `/architect:report`.
How does Nexus Architect generate code?
Skills like `/architect:generate-scalardb-code` produce Spring Boot + ScalarDB implementation, while `/architect:generate-infra-code` creates Kubernetes/Terraform specifications. `/scalardb:scaffold` generates complete starter projects. All output includes SQL schemas, Java classes, configuration files, and deployment manifests.
What databases can Nexus Architect migrate?
The toolkit supports Oracle, MySQL, and PostgreSQL migration to ScalarDB. Run `/architect:migrate-database` for automated routing or use database-specific skills: `/architect:migrate-oracle`, `/architect:migrate-mysql`, `/architect:migrate-postgresql`. Each analyzes schemas, stored procedures, and triggers.
Can I use this with Codex instead of Claude Code?
Yes. Clone the repository, then open Codex at the repo root. Use the same command syntax—`/architect:start ./path`, `/scalardb:model`—and Codex translates them to skill files via `AGENTS.md`. No Claude Code plugin installation needed.
How does the review phase work?
Nexus Architect runs 5-7 parallel reviews: consistency (structural coherence), ScalarDB constraints, data integrity, operations readiness, distributed system risks, and business requirements. `/architect:review-synthesizer` consolidates findings into a quality gate report with actionable improvement priorities.
What's included in the architecture report?
Reports include executive summary, tech stack analysis, domain maps, bounded contexts, ER diagrams, API specifications, Kubernetes configs, security assessments, disaster recovery plans, cost estimates, and recommendations. Output is Markdown, convertible to HTML via `/architect:report`.

Glossary

Bounded Context
A Domain-Driven Design concept defining explicit boundaries where a specific model applies. Nexus Architect maps these contexts and designs microservices around them to reduce coupling and improve scalability.
DDD Evaluation
A 12-criteria assessment across domain understanding, ubiquitous language, and architecture layers. Nexus Architect scores systems to identify DDD maturity and readiness for distributed refactoring.
MMI (Modular Maturity Index)
A 4-axis qualitative evaluation measuring modularity, maintainability, interoperability, and interchangeability. Nexus Architect uses this to assess legacy system health before redesign.
ScalarDB
A distributed database offering ACID transactions across heterogeneous datastores. Nexus Architect specializes in migrating monoliths to ScalarDB for horizontal scalability without distributed transaction complexity.

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