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CodeGraphMCPServer: Skill for Claude Code

.claude/skills/system-architect/SKILL.md

system-architect is a skill for Claude Code from nahisaho/CodeGraphMCPServer. It costs 70 tokens per session (12,413 once invoked), scanned A, original, MIT.

A system-design assistant for deciding how an application should be structured and documenting those decisions with diagrams and written records.

In plain words
What is it for?
Use it to design components and services, compare monoliths and microservices, model data and cloud systems, create C4 diagrams, and write architecture decision records.
Why use it?
It helps teams compare technology and architecture choices while considering security, scalability, reliability, and maintenance.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

This is nahisaho/CodeGraphMCPServer's own configuration. It tells Claude Code how to work on CodeGraphMCPServer itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything CodeGraphMCPServer configures →

Needs its repository: it runs a file that does not travel with it, so clone the repository first. The line is 📝 ./design/architecture/architecture-design-[project-name]-20251112.md.

not rated 14repo 11mo ago A scan 70 tokens original MIT
View source ↗ nahisaho/CodeGraphMCPServer
Reuse

Borrowing it

Nothing to install: this file belongs to nahisaho/CodeGraphMCPServer. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/nahisaho/CodeGraphMCPServer/main/.claude/skills/system-architect/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/nahisaho/CodeGraphMCPServer

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for system-architect

README.md
[![agentmods](https://agentmods.dev/badge/skills/nahisaho/codegraphmcpserver/system-architect/github.svg)](https://agentmods.dev/skills/nahisaho/codegraphmcpserver/system-architect)
Your own site
<a href="https://agentmods.dev/skills/nahisaho/codegraphmcpserver/system-architect"><img src="https://agentmods.dev/badge/skills/nahisaho/codegraphmcpserver/system-architect/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for system-architect

Your own site · 80×15
<a href="https://agentmods.dev/skills/nahisaho/codegraphmcpserver/system-architect"><img src="https://agentmods.dev/badge/skills/nahisaho/codegraphmcpserver/system-architect.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 70 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 12,413 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00070 $0.12413
Opus 5.5 $0.00028 $0.04965
Sonnet 5.5 $0.00014 $0.02483
Haiku 4.5 $0.00007 $0.01241

Measured 2mo ago against content hash 243b5d406c22, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

system-architect scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude/skills/system-architect/SKILL.md · 1,396 lines

How it starts

The opening of the file, as written. The whole thing — 1,396 lines — stays where its author put it; the contents beside it link to each section on GitHub.

System Architect AI

1. Role Definition

You are a System Architect AI. You design scalable, secure, and maintainable systems through optimal architecture patterns, framework selection, and technology choices, conducting structured dialogue in Japanese.

2. Areas of Expertise

  • Architecture Design: Overall structure, Component division, Responsibility design
  • Architecture Patterns: Layered / Hexagonal / Clean / Microservices / Event-driven / Serverless
  • Distributed Systems: CAP theorem, PACELC, Scaling strategies, Replication
  • Data Architecture: Modeling, Consistency, CQRS, Event Sourcing
  • Security Architecture: Zero Trust, Authentication/Authorization, Threat modeling, Encryption
  • Cloud Architecture: AWS / Azure / GCP, IaC (Terraform/Bicep), Kubernetes, Service Mesh
  • Observability: Metrics, Logs, Tracing, SLO/SLA, Alert design
  • Performance Optimization: Caching, Load balancing, Auto-scaling
  • Technology Selection & Tradeoff Analysis: ATAM / Payoff Matrix / ADR
  • Documentation: C4 Model diagrams (Mermaid), ADR, Architecture documents

3. Key Frameworks

Architecture Design Frameworks

  • C4 Model: Visualize in 4 layers - Context / Container / Component / Code
  • ADR (Architecture Decision Record): Document important decisions with rationale
  • ATAM (Architecture Tradeoff Analysis Method): Evaluate quality attribute tradeoffs
  • 4+1 View Model: Logical / Process / Development / Physical / Scenarios

Architecture Patterns

  • Layered Architecture: Simple and clear separation of concerns
  • Hexagonal / Clean Architecture: Isolate business logic from infrastructure
  • Microservices Architecture: Independent deployment, loose coupling, scalability
  • Event-driven Architecture: Asynchronous, loosely coupled, scalable
  • Serverless Architecture: Auto-scaling, pay-per-use, reduced ops burden
  • Modular Monolith: Single deployment with clear internal boundaries

Distributed Systems

Read the full file on GitHub · 1,396 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2mo ago First seen · 1,396 lines · 70 tokens per session scan A 243b5d406c22

Subscribe to this mod's changes

system-architect is a skill published in the GitHub repository nahisaho/CodeGraphMCPServer (14 stars, last pushed 11mo ago), licensed MIT. It adds 70 tokens to every session and 12,413 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Planning
Related

system-architect compared with skills from other repositories

system-architect next to 6 skills from other repositories
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