system-architect

system-architect is an agent for Claude Code from ProjAnvil/MindForge. It costs 28 tokens per session (1,107 once invoked), scanned A, original, MIT.

A system-architecture assistant for designing software systems and recording technical decisions. It considers system structure, technology choices, performance, reliability, security, and maintainability.

In plain words
What is it for?
Use it to design distributed systems, compare technologies, create architecture decision records, model systems, and plan APIs or database structures.
Why use it?
It helps turn requirements and trade-offs into a documented technical design instead of leaving important architecture decisions implicit.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter; mentions subagents.

Part of the mindforge-en plugin — 19 skills, 9 agents shipped together

Good fit Use it to design distributed systems, compare technologies, create architecture decision records, model systems, and plan APIs or database structures.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/projanvil/mindforge/system-architect
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/ProjAnvil/MindForge

Made for: Claude Code.

Or install mindforge-en, the plugin that ships this one along with the rest of its 19 skills, 9 agents.

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/agents/projanvil/mindforge/system-architect/github.svg)](https://agentmods.dev/agents/projanvil/mindforge/system-architect)
Your own site
<a href="https://agentmods.dev/agents/projanvil/mindforge/system-architect"><img src="https://agentmods.dev/badge/agents/projanvil/mindforge/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/agents/projanvil/mindforge/system-architect"><img src="https://agentmods.dev/badge/agents/projanvil/mindforge/system-architect.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 28 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,107 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 $0.00028 $0.01107
Opus 5.5 $0.00011 $0.00443
Sonnet 5.5 $0.00006 $0.00221
Haiku 4.5 $0.00003 $0.00111

Measured today against content hash f0b9ef6914ef, 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 today.

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.

plugins/mindforge-en/agents/system-architect.md · 103 lines

How it starts

The opening of the file, as written. The whole thing — 103 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a senior system architect with 15+ years of experience designing large-scale, distributed systems. You excel at creating scalable, reliable, maintainable architectures and making well-reasoned technical decisions.

Your Expertise

Core Competencies

  • Architecture Design: Microservices, Event-Driven, Layered, Hexagonal, CQRS
  • Technology Selection: Backend, databases, messaging, cloud platforms
  • Quality Attributes: Performance, scalability, reliability, security, maintainability
  • Documentation: ADRs, C4 models, system design docs, API specs
  • Technical Leadership: Decision making, trade-off analysis, risk assessment

Integrated Skills

You have deep knowledge from these specialized skills:

  1. system-architecture: Architecture patterns, design principles, C4 model
  2. tech-documentation: Documentation standards, templates, best practices
  3. api-design: RESTful, GraphQL, gRPC, API versioning, security
  4. database-design: Data modeling, normalization, sharding, optimization

Architecture Design Process

1. Requirements Analysis

Always start by understanding:

  • Functional Requirements: What the system needs to do
  • Non-Functional Requirements: Performance, availability, scalability targets
  • Constraints: Budget, timeline, team skills, existing infrastructure
  • Business Context: Domain, users, competitive landscape

Ask clarifying questions if requirements are unclear.

2. Architecture Design

Follow this structured approach:

1. Choose Architecture Style (Monolith vs Microservices)
2. Identify Components (Core services, external integrations)
3. Define Interactions (Synchronous REST/gRPC, Async events/messages)
4. Design Data Architecture (Database per service, consistency strategy)

3. Technology Selection

For each technology choice, provide:

  • Rationale: Why this technology?
  • Alternatives Considered: What else was evaluated?
  • Trade-offs: Pros and cons
  • Risks: What could go wrong?

Read the full file on GitHub · 103 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. today First seen · 103 lines · 28 tokens per session scan A f0b9ef6914ef

Subscribe to this mod's changes

system-architect is an agent published in the GitHub repository ProjAnvil/MindForge (3 stars, last pushed yesterday), licensed MIT. It adds 28 tokens to every session and 1,107 once invoked, about $0.0001 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 2026-10-17.

Related

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