A guide for starting full-stack applications with project templates, monorepos, and automated testing and deployment. A monorepo stores multiple related apps or packages in one repository.

Use it to scaffold applications, organize multiple services or packages, choose a technology stack, define APIs and data models, and configure CI/CD.

It helps turn early project decisions into a consistent codebase structure, development setup, and delivery process.

app-builder — Skill for Claude Code and Codex by bugrabilge

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.

Any agent

npx skills add bugrabilge/bilge-development-kit --skill app-builder

Clone the repo

git clone --depth 1 https://github.com/bugrabilge/bilge-development-kit

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/bugrabilge/bilge-development-kit/app-builder.svg)](https://agentmods.dev/skills/bugrabilge/bilge-development-kit/app-builder)

Your own site

<a href="https://agentmods.dev/skills/bugrabilge/bilge-development-kit/app-builder"><img src="https://agentmods.dev/badge/skills/bugrabilge/bilge-development-kit/app-builder.svg" alt="Measured on agentmods" height="20"></a>

Per session 28 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,836 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.

Model	Per session	Once invoked
Fable 5.1	$0.00028	$0.01836
Opus 5	$0.00014	$0.00918
Sonnet 5	$0.00006	$0.00367
Haiku 4.5	$0.00003	$0.00184

Measured 4d ago against content hash 415f3b2f7fd1, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

app-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 4d 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.

skills/app-builder/SKILL.md · 197 lines

How it starts

The opening of the file, as written. The whole thing — 197 lines — stays where its author put it; the contents beside it link to each section on GitHub.

App Builder

"Weeks of coding can save you hours of planning." -- Unknown

When to Use

Scaffolding a new full-stack application from scratch
Setting up monorepo structures with multiple packages or services
Configuring CI/CD pipelines for automated testing and deployment
Choosing and configuring project templates and starter kits
Establishing project conventions (linting, formatting, commit hooks)
Planning technology stack decisions for new projects

Project Scaffolding Principles

Before Writing Code

Define the scope: What does the MVP look like? What are the core features?
Choose the stack: Pick technologies based on team expertise, requirements, and ecosystem maturity
Design the data model: Sketch entities, relationships, and access patterns before coding
Plan the API surface: Define endpoints or queries/mutations before implementing
Set up the repository: Structure, tooling, and CI/CD before feature development

Directory Structure Conventions

A well-organized project follows predictable patterns:

project-root/
  apps/               # Application entry points
    web/              # Frontend application
    api/              # Backend API server
    mobile/           # Mobile application
  packages/           # Shared libraries
    ui/               # Shared UI components
    config/           # Shared configurations
    types/            # Shared TypeScript types
    utils/            # Shared utility functions
  infra/              # Infrastructure as code
  scripts/            # Build and maintenance scripts
  docs/               # Project documentation

Technology Stack Selection

Frontend Frameworks

Framework	Best For	Considerations
Next.js	Full-stack React, SSR/SSG, SEO	Vercel ecosystem, app router maturity
Nuxt	Full-stack Vue, SSR/SSG	Vue ecosystem, auto-imports
SvelteKit	Performance-critical apps	Smaller ecosystem, growing fast
Remix	Nested routing, progressive enhancement	React Router foundation
Astro	Content-heavy sites, multi-framework	Content collections, island architecture

Read the full file on GitHub · 197 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.

4d ago First seen · 197 lines · 28 tokens per session scan A 415f3b2f7fd1

Subscribe to this mod's changes

app-builder is a skill published in the GitHub repository bugrabilge/bilge-development-kit (10 stars, last pushed 4mo ago), licensed MIT. It adds 28 tokens to every session and 1,836 once invoked, about $0.0001 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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