A systematic troubleshooting guide for Ruby on Rails applications. Rails is a framework for building web applications in Ruby.

Use it to diagnose ActiveRecord errors, routing problems, N+1 queries, asset and migration failures, gem conflicts, controller errors, and CSRF token issues.

It helps identify the causes of common Rails failures instead of treating each error as an isolated problem. It covers database lookup errors, routing, repeated database queries, assets, migrations, dependencies, controller errors, and CSRF protection.

debug:rails — Skill for Claude Code by SnakeO

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 SnakeO/claude-debug-and-refactor-skills-plugin --skill debug-rails

Clone the repo

git clone --depth 1 https://github.com/SnakeO/claude-debug-and-refactor-skills-plugin

Made for: Claude Code.

Or install debug-and-refactor, the plugin that ships this one along with the rest of its 45 skills.

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/snakeo/claude-debug-and-refactor-skills-plugin/debug-rails/github.svg)](https://agentmods.dev/skills/snakeo/claude-debug-and-refactor-skills-plugin/debug-rails)

Your own site

<a href="https://agentmods.dev/skills/snakeo/claude-debug-and-refactor-skills-plugin/debug-rails"><img src="https://agentmods.dev/badge/skills/snakeo/claude-debug-and-refactor-skills-plugin/debug-rails/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/snakeo/claude-debug-and-refactor-skills-plugin/debug-rails"><img src="https://agentmods.dev/badge/skills/snakeo/claude-debug-and-refactor-skills-plugin/debug-rails.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 61 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 4,094 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 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.

Model	Per session	Once invoked
Fable 5.1	$0.00061	$0.04094
Opus 5.5	$0.00024	$0.01638
Sonnet 5.5	$0.00012	$0.00819
Haiku 4.5	$0.00006	$0.00409

Measured 2mo ago against content hash 57fcf5d8999c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

debug:rails 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 2mo 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/debug-and-refactor/skills/debug-rails/SKILL.md · 852 lines

The source is not reproduced here

No licence file

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.

2mo ago First seen · 852 lines · 61 tokens per session scan A 57fcf5d8999c

Subscribe to this mod's changes

debug:rails is a skill published in the GitHub repository SnakeO/claude-debug-and-refactor-skills-plugin (9 stars, last pushed 9mo ago), with no licence file. It adds 61 tokens to every session and 4,094 once invoked, about $0.0002 per session on Opus 5.5. 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.

Debugging Languages Ruby

debug:rails next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
debug:railsSnakeO/claude-debug-and-refactor-skills-plugin	Skill	9	9mo ago	none	A	61	Claude Code
sentry-ruby-sdkgetsentry/sentry-for-ai	Skill	275	yesterday	MIT	A	98	Claude Code
rigor-type-oraclerigortype/rigor	Skill	107	today	MPL-2.0	A	72	Claude Code, Codex
rigor-rbs-setuprigortype/rigor	Skill	107	today	MPL-2.0	A	60	Claude Code, Codex
error-tracking-rubyPostHog/skills	Skill	79	yesterday	MIT	A	13	Claude Code
sentry-ruby-sdkis-bo/fullstack-forge-skill	Skill	2	6d ago	Apache-2.0	A	98	Claude Code
Upgrade Fixdhruvasagar/ruby-upgrade-toolkit	Skill	14	6mo ago	none	A	101	Claude Code