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rails-upgrade

rails-upgrade is a skill for Claude Code from zarpay/rails-template. It costs 59 tokens per session (2,240 once invoked), scanned A, original, MIT.

A guide for moving a Ruby on Rails application from one Rails version to another. It checks the current project, plans intermediate upgrades when needed, and addresses breaking changes, warnings, configuration changes, and gem compatibility.

In plain words
What is it for?
Use it to assess upgrade readiness, choose a safe sequence of Rails versions, inspect Ruby compatibility, investigate deprecations, and update Rails configuration and dependencies.
Why use it?
It turns a risky version jump into a structured compatibility check and upgrade plan.

Skill for Claude Code

Written for Claude Code: installed under .claude/.

not rated 9repo 28d ago A scan 59 tokens original MIT

Good fit Use it to assess upgrade readiness, choose a safe sequence of Rails versions, inspect Ruby compatibility, investigate deprecations, and update Rails configuration and dependencies.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/zarpay/rails-template/rails-upgrade
View source ↗ zarpay/rails-template
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 zarpay/rails-template --skill rails-upgrade
Clone the repo
git clone --depth 1 https://github.com/zarpay/rails-template

Made for: Claude Code.

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 rails-upgrade

README.md
[![agentmods](https://agentmods.dev/badge/skills/zarpay/rails-template/rails-upgrade/github.svg)](https://agentmods.dev/skills/zarpay/rails-template/rails-upgrade)
Your own site
<a href="https://agentmods.dev/skills/zarpay/rails-template/rails-upgrade"><img src="https://agentmods.dev/badge/skills/zarpay/rails-template/rails-upgrade/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.

agentmods 80×15 button for rails-upgrade

Your own site · 80×15
<a href="https://agentmods.dev/skills/zarpay/rails-template/rails-upgrade"><img src="https://agentmods.dev/badge/skills/zarpay/rails-template/rails-upgrade.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 59 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,240 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00059 $0.02240
Opus 5 $0.00030 $0.01120
Sonnet 5 $0.00012 $0.00448
Haiku 4.5 $0.00006 $0.00224

Measured 10d ago against content hash dee52175c236, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

rails-upgrade 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 10d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/fetch-changelogs.sh), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

files/.claude/skills/rails-upgrade/SKILL.md · 233 lines

How it starts

The opening of the file, as written. The whole thing — 233 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Rails Upgrade

Overview

This skill provides a systematic workflow for upgrading Rails applications, covering versions 5.2 through the latest release. It fetches live configuration diffs from railsdiff.org via the GitHub API, performs direct codebase detection using Grep, Glob, and Read tools, and compiles structured upgrade reports — all without requiring external skill dependencies.

Announce at start: "I'm using the rails-upgrade skill to guide this upgrade."

Ruby Version Compatibility

Rails Minimum Ruby Recommended Ruby
5.2 2.2.2 2.5+
6.0–6.1 2.5.0 2.7+
7.0–7.1 2.7.0 3.1+
7.2 3.1.0 3.3+
8.0+ 3.2.0 3.3+

The Workflow

Step 0: Version Assessment

  1. Read Gemfile and Gemfile.lock to find the current Rails gem version
  2. Read config/application.rb to find the current config.load_defaults value
  3. Check .ruby-version or Gemfile for the Ruby version — verify against the compatibility table above
  4. Confirm the target version with the user if not specified
  5. If the jump spans more than one minor version, plan sequential hops (e.g., 7.0 → 8.0 requires 7.0 → 7.1 → 7.2 → 8.0)
  6. Output: version assessment summary (current Rails, current Ruby, target Rails, required Ruby, upgrade path)

Step 1: Test Suite Verification

HARD GATE: Run the test suite before ANY upgrade work.
If tests fail: STOP. Report failures. Do NOT proceed until baseline is green.
A failing baseline makes post-upgrade failures ambiguous.
  1. Detect framework: check for spec/ (RSpec) or test/ (Minitest)
  2. Run: bundle exec rspec or bundle exec rails test
  3. Record: total tests, passing, failing, pending
  4. If any failures: STOP, report them, offer to help fix
  5. If all pass: record as baseline, proceed to Step 2

Step 2: Configuration Diff (railsdiff.org)

Read the full file on GitHub · 233 lines

Files

What ships with it

8 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 10d ago First seen · 233 lines · 59 tokens per session scan A dee52175c236

Subscribe to this mod's changes

rails-upgrade is a skill published in the GitHub repository zarpay/rails-template (9 stars, last pushed 28d ago), licensed MIT. It adds 59 tokens to every session and 2,240 once invoked, about $0.0003 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.

Backend and APIsLanguagesRuby
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