ruby-on-rails

An automated security-testing agent for Ruby on Rails applications. Ruby on Rails is a framework used to build web applications with the Ruby programming language.

In plain words
What is it for?
Use it to test a Ruby on Rails application through its connected security-testing tools.
Why use it?
It helps investigate security weaknesses in applications built with Rails without requiring every check to be performed manually.

Agent

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 agents/ascit31/dark-moon/ruby
Clone the repo
git clone --depth 1 https://github.com/ASCIT31/Dark-Moon
Per session 22 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 8,114 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 2 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 $0.00022 $0.08114
Opus 5 $0.00011 $0.04057
Sonnet 5 $0.00004 $0.01623
Haiku 4.5 $0.00002 $0.00811

Measured 2d ago against content hash 9f78c6281706, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade B, and why

ruby-on-rails scanned grade B with 2 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 2d 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.

Cloud metadata endpointmediumServer-side request forgery

One request to 169.254.169.254 can return temporary IAM credentials.

http://169.254.169.254/latest/meta-data/

Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

- NEVER run parallel curl loops (& ... wait) with more than 3 concurrent workers.
conf/agents/ruby.md · 1,311 lines

The source is not reproduced here

Licensed GPL-3.0

The repository is licensed GPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

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. 2d ago First seen · 1,311 lines · 22 tokens per session scan B 9f78c6281706

Subscribe to this mod's changes

ruby-on-rails is an agent published in the GitHub repository ASCIT31/Dark-Moon (878 stars, last pushed 3d ago), licensed GPL-3.0. It adds 22 tokens to every session and 8,114 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it B with 2 findings (cloud metadata endpoint, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.