sinatra-scaffold

sinatra-scaffold is a command for coding agents from geoffjay/claude-plugins. It costs 18 tokens per session (3,600 once invoked), scanned A, original, MIT.

A project generator for Sinatra applications, which are web applications built with the Ruby Sinatra framework. It creates a starting structure with tests and deployment settings.

In plain words
What is it for?
Use it to start classic, modular, or API-only Sinatra projects. You can choose RSpec or Minitest for tests, Sequel or ActiveRecord for database access, and ERB, Haml, or no frontend.
Why use it?
It removes the repetitive setup work involved in choosing an application style, testing tool, database connection, and view format.

Command

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 commands/geoffjay/claude-plugins/sinatra-scaffold
Clone the repo
git clone --depth 1 https://github.com/geoffjay/claude-plugins

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 sinatra-scaffold

README.md
[![agentmods](https://agentmods.dev/badge/commands/geoffjay/claude-plugins/sinatra-scaffold.svg)](https://agentmods.dev/commands/geoffjay/claude-plugins/sinatra-scaffold)
Your own site
<a href="https://agentmods.dev/commands/geoffjay/claude-plugins/sinatra-scaffold"><img src="https://agentmods.dev/badge/commands/geoffjay/claude-plugins/sinatra-scaffold.svg" alt="Measured on agentmods" height="20"></a>
Per session 18 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 3,600 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00018 $0.03600
Opus 5 $0.00009 $0.01800
Sonnet 5 $0.00004 $0.00720
Haiku 4.5 $0.00002 $0.00360

Measured 3d ago against content hash 6ab8762d2acf, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

sinatra-scaffold 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 3d 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.

plugins/ruby-sinatra-advanced/commands/sinatra-scaffold.md · 655 lines

How it starts

The opening of the file, as written. The whole thing — 655 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Sinatra Scaffold Command

Scaffolds a new Sinatra application with modern project structure, testing framework, and deployment configuration.

Arguments

  • $1: project-name (required) - Name of the project/application
  • $2: type (optional) - Application type: classic, modular, or api (default: modular)
  • $3: options (optional) - JSON string with configuration options:
    • testing: rspec or minitest (default: rspec)
    • database: sequel, activerecord, or none (default: sequel)
    • frontend: none, erb, or haml (default: erb)

Usage Examples

# Basic modular app with defaults
/sinatra-scaffold my-app

# Classic app with RSpec and no database
/sinatra-scaffold simple-app classic '{"testing":"rspec","database":"none","frontend":"erb"}'

# API-only app with Minitest and ActiveRecord
/sinatra-scaffold api-service api '{"testing":"minitest","database":"activerecord","frontend":"none"}'

# Full-featured modular app
/sinatra-scaffold webapp modular '{"testing":"rspec","database":"sequel","frontend":"haml"}'

Workflow

Step 1: Validate and Initialize

Actions:

  1. Validate project name format (alphanumeric, hyphens, underscores)
  2. Check if directory already exists
  3. Parse and validate options JSON
  4. Create project directory structure

Validation:

# Check project name
if [[ ! "$PROJECT_NAME" =~ ^[a-zA-Z0-9_-]+$ ]]; then
  echo "Error: Invalid project name. Use alphanumeric characters, hyphens, or underscores."
  exit 1
fi

# Check if directory exists
if [ -d "$PROJECT_NAME" ]; then
  echo "Error: Directory '$PROJECT_NAME' already exists."
  exit 1
fi

Step 2: Create Directory Structure

Classic Structure:

project-name/
├── app.rb
├── config.ru
├── Gemfile
├── Rakefile
├── config/
│   └── environment.rb
├── public/
│   ├── css/
│   ├── js/
│   └── images/
├── views/
│   ├── layout.erb
│   └── index.erb
├── spec/ or test/
└── README.md

Modular Structure:

project-name/
├── app/
│   ├── controllers/
│   │   ├── application_controller.rb
│   │   └── base_controller.rb
│   ├── models/
│   ├── services/
│   └── helpers/
├── config/
│   ├── environment.rb
│   ├── database.yml (if database selected)
│   └── puma.rb
├── config.ru
├── db/
│   └── migrations/
├── lib/
│   └── tasks/
├── public/
│   ├── css/
│   ├── js/
│   └── images/
├── views/
│   ├── layout.erb
│   └── index.erb
├── spec/ or test/
│   ├── spec_helper.rb
│   └── controllers/
├── Gemfile
├── Rakefile
├── .env.example
├── .gitignore
└── README.md

Read the full file on GitHub · 655 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. 3d ago First seen · 655 lines · 18 tokens per session scan A 6ab8762d2acf

Subscribe to this mod's changes

sinatra-scaffold is a command published in the GitHub repository geoffjay/claude-plugins (8 stars, last pushed 10mo ago), licensed MIT. It adds 18 tokens to every session and 3,600 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 2026-08-31.