architecture-builder

architecture-builder is a skill for Claude Code, Codex from vmobifystudio/app-dev-team. It costs 46 tokens per session (890 once invoked), scanned A, original, MIT.

Use to produce the technical architecture doc and engineering principles for a mobile app. Used primarily by the CTO agent. Triggers on "design the architecture", "pick the stack", or as part of /app-plan.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/vmobifystudio/app-dev-team/architecture-builder
Any agent
npx skills add vmobifystudio/app-dev-team --skill architecture-builder
Clone the repo
git clone --depth 1 https://github.com/vmobifystudio/app-dev-team

Made for: Claude Code, Codex.

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 architecture-builder

README.md
[![agentmods](https://agentmods.dev/badge/skills/vmobifystudio/app-dev-team/architecture-builder.svg)](https://agentmods.dev/skills/vmobifystudio/app-dev-team/architecture-builder)
Your own site
<a href="https://agentmods.dev/skills/vmobifystudio/app-dev-team/architecture-builder"><img src="https://agentmods.dev/badge/skills/vmobifystudio/app-dev-team/architecture-builder.svg" alt="Measured on agentmods" height="20"></a>
Per session 46 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 890 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown 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 $0.00046 $0.00890
Opus 5 $0.00023 $0.00445
Sonnet 5 $0.00009 $0.00178
Haiku 4.5 $0.00005 $0.00089

Measured today against content hash 70994a3939a6, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

architecture-builder 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.

skills/architecture-builder/SKILL.md · 69 lines

How it starts

The opening of the file, as written. The whole thing — 69 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Architecture builder

Produce docs/20-architecture.md and docs/21-engineering-principles.md from docs/00-vision.md + docs/10-prd.md.

docs/20-architecture.md sections

  1. Platform decision — iOS / Android / both, with order if sequential.
  2. iOS stack
    • Swift version (latest stable)
    • Minimum iOS target — resolve knowledge/stack-defaults.md's relative rule (flagship = latest major minus one) to a concrete number here, and record how you resolved it
    • UI: SwiftUI by default; UIKit only if PRD demands something SwiftUI struggles with
    • State: @Observable + @MainActor on ViewModels only (Combine / @Published / ObservableObject are forbidden — knowledge/ios-conventions.md)
    • Networking: URLSession + async/await, or a named lib
    • Persistence: SwiftData (content apps) or GRDB+SQLite/FTS5 (camera/media) — pick by PRD complexity
    • DI: lightweight — protocol + initializer injection
    • Testing: Swift Testing (@Test/@Suite) for unit and domain tests, not XCTest. UI automation stays XCUITest — it is XCTest-based, has no Swift Testing equivalent, and runtime-gate runs it, so a blanket "never XCTest" would ban the suite the release gate expects. Name the snapshot lib. State the coverage floor for the pure-Swift domain engine package (knowledge/stack-defaults.md)
  3. Android stack
    • Kotlin version
    • minSdk / targetSdk (set based on PRD users)
    • UI: Jetpack Compose
    • Architecture: MVVM or MVI, picked once
    • Networking: Retrofit + OkHttp + Kotlinx Serialization (or named alternative)
    • Persistence: Room (or named alternative)
    • DI: Hilt (flagship) or Koin (utility tier)
    • Async: Coroutines + Flow
    • Testing: JUnit, Turbine, MockK, Paparazzi (screenshot), Compose UI test
  4. Shared concerns — auth, analytics, crash reporting, feature flags, remote config, push.
  5. Backend interface — sketch the APIs the apps need. If backend is in scope, name the service shape.
  6. Repository layout

Read the full file on GitHub · 69 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 · 69 lines · 46 tokens per session scan A 70994a3939a6

Subscribe to this mod's changes

architecture-builder is a skill published in the GitHub repository vmobifystudio/app-dev-team (4 stars, last pushed 24d ago), licensed MIT. It adds 46 tokens to every session and 890 once invoked, about $0.0002 per session on Opus 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 2026-09-03.

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