sdd-init

sdd-init is a command for coding agents from maquina-app/rails-claude-code. It costs 15 tokens per session (186 once invoked), scanned A, original, MIT.

A project setup command for Spec-Driven Development, a way to plan software work in written specifications before coding, in a Rails project.

In plain words
What is it for?
Use it to initialize the `sdd/` folder, Rails coding standards, an index of those standards, and a progress tracker.
Why use it?
It creates the standard folders and tracking files needed to organize this workflow, so the project does not start with an empty structure.

Command

Installs and runs on its own, but its text points at files inside its plugin — anything it tells you to read at a ${CLAUDE_PLUGIN_ROOT} path is only there once the plugin is installed. Installing the plugin gets both.

Part of the spec-driven-development plugin — 1 skill, 6 commands shipped together

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/maquina-app/rails-claude-code/sdd-init
Clone the repo
git clone --depth 1 https://github.com/maquina-app/rails-claude-code

Or install spec-driven-development, the plugin that ships this one along with the rest of its 1 skill, 6 commands.

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 sdd-init

README.md
[![agentmods](https://agentmods.dev/badge/commands/maquina-app/rails-claude-code/sdd-init.svg)](https://agentmods.dev/commands/maquina-app/rails-claude-code/sdd-init)
Your own site
<a href="https://agentmods.dev/commands/maquina-app/rails-claude-code/sdd-init"><img src="https://agentmods.dev/badge/commands/maquina-app/rails-claude-code/sdd-init.svg" alt="Measured on agentmods" height="20"></a>
Per session 15 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 186 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 $0.00015 $0.00186
Opus 5 $0.00008 $0.00093
Sonnet 5 $0.00003 $0.00037
Haiku 4.5 $0.00002 $0.00019

Measured 5d ago against content hash 23609ca0afca, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

sdd-init 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 5d 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.

spec-driven-development/commands/sdd-init.md · 23 lines

What it actually says

Initialize Spec-Driven Development for this Rails project.

Run the bootstrap script shipped with the spec-driven-development plugin:

bash ${CLAUDE_PLUGIN_ROOT}/scripts/init_sdd.sh

(If $CLAUDE_PLUGIN_ROOT is not set, locate init_sdd.sh inside the installed spec-driven-development plugin directory and run it from the project root.)

This creates the sdd/ directory structure with:

  • Pre-built Rails standards files (global, backend, frontend, testing)
  • sdd/standards/index.yml catalog
  • sdd/progress.yml tracker

The /sdd-* slash commands are provided by the plugin itself — no per-project install needed.

After running, confirm the structure was created and suggest running /sdd-plan next.

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. 5d ago First seen · 23 lines · 15 tokens per session scan A 23609ca0afca

Subscribe to this mod's changes

sdd-init is a command published in the GitHub repository maquina-app/rails-claude-code (47 stars, last pushed 19d ago), licensed MIT. It adds 15 tokens to every session and 186 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 2026-08-30.