Rails Upgrade Analyzer

Overview

This public intake copy packages

plugins/antigravity-awesome-skills-claude/skills/skill-rails-upgrade

https://github.com/sickn33/antigravity-awesome-skills

Use it when the operator needs the upstream workflow, support files, and repository context to stay intact while the public validator and private enhancer continue their normal downstream flow.

This intake keeps the copied upstream files intact and uses

metadata.json

ORIGIN.md

Imported source sections that did not map cleanly to the public headings are still preserved below or in the support files. Notable imported sections: Upgrade Plan: Rails X.Y.Z → A.B.C, Error Handling, Limitations.

When to Use This Skill

Use this section as the trigger filter. It should make the activation boundary explicit before the operator loads files, runs commands, or opens a pull request.

• Analyze Rails apps and provide upgrade assessments Use this skill when working with analyze rails apps and provide upgrade assessments.

• Rails Upgrade Analyzer Analyze the current Rails application and provide a comprehensive upgrade assessment with selective file merging.

• Use when provenance needs to stay visible in the answer, PR, or review packet.
• Use when copied upstream references, examples, or scripts materially improve the answer.
• Use when the workflow should remain reviewable in the public intake repo before the private enhancer takes over.

Operating Table

metadata.json

ORIGIN.md

SKILL.md

SKILL.md

## Related Skills

Workflow

This workflow is intentionally editorial and operational at the same time. It keeps the imported source useful to the operator while still satisfying the public intake standards that feed the downstream enhancer flow.

1. Gemfile (must exist and contain 'rails')
2. config/application.rb (Rails application config)
3. config/environment.rb (Rails environment)
4. First, check Gemfile.lock for the exact installed version (look for rails (x.y.z))
5. If not found, check Gemfile for the version constraint
6. Patch upgrade: Same major.minor, different patch (e.g., 7.1.3 → 7.1.5)
7. Minor upgrade: Same major, different minor (e.g., 7.1.3 → 7.2.0)

Imported Workflow Notes

Imported: Step 1: Verify Rails Application

Check that we're in a Rails application by looking for these files:

• Gemfile

  (must exist and contain 'rails')

• config/application.rb

  (Rails application config)

• config/environment.rb

  (Rails environment)

If any of these are missing or don't indicate a Rails app, stop and inform the user this doesn't appear to be a Rails application.

Imported: Step 2: Get Current Rails Version

Extract the current Rails version from:

1. First, check

   Gemfile.lock

   for the exact installed version (look for

   rails (x.y.z)

   )
2. If not found, check

   Gemfile

   for the version constraint

Report the exact current version (e.g.,

7.1.3

Imported: Step 3: Find Latest Rails Version

Use the GitHub CLI to fetch the latest Rails release:

gh api repos/rails/rails/releases/latest --jq '.tag_name'

This returns the latest stable version tag (e.g.,

v8.0.1

Also check recent tags to understand the release landscape:

gh api repos/rails/rails/tags --jq '.[0:10] | .[].name'

Imported: Step 4: Determine Upgrade Type

Compare current and latest versions to classify the upgrade:

• Patch upgrade: Same major.minor, different patch (e.g., 7.1.3 → 7.1.5)
• Minor upgrade: Same major, different minor (e.g., 7.1.3 → 7.2.0)
• Major upgrade: Different major version (e.g., 7.1.3 → 8.0.0)

Imported: Step 5: Fetch Upgrade Guide

Use WebFetch to get the official Rails upgrade guide:

URL:

https://guides.rubyonrails.org/upgrading_ruby_on_rails.html

Look for sections relevant to the version jump. The guide is organized by target version with sections like:

• "Upgrading from Rails X.Y to Rails X.Z"
• Breaking changes
• Deprecation warnings
• Configuration changes
• Required migrations

Extract and summarize the relevant sections for the user's specific upgrade path.

Imported: Step 6: Fetch Rails Diff

Use WebFetch to get the diff between versions from railsdiff.org:

URL:

https://railsdiff.org/{current_version}/{target_version}

For example:

https://railsdiff.org/7.1.3/8.0.0

This shows:

• Changes to default configuration files
• New files that need to be added
• Modified initializers
• Updated dependencies
• Changes to bin/ scripts

Summarize the key file changes.

Imported: Step 7: Check JavaScript Dependencies

Rails applications often include JavaScript packages that should be updated alongside Rails. Check for and report on these dependencies.

7.1: Identify JS Package Manager

Check which package manager the app uses:

# Check for package.json (npm/yarn)
ls package.json 2>/dev/null

# Check for importmap (Rails 7+)
ls config/importmap.rb 2>/dev/null

7.2: Check Rails-Related JS Packages

If

package.json

# Extract current versions of Rails-related packages
cat package.json | grep -E '"@hotwired/|"@rails/|"stimulus"|"turbo-rails"' || echo "No Rails JS packages found"

Key packages to check:

@hotwired/turbo-rails

@hotwired/stimulus

@rails/actioncable

@rails/activestorage

@rails/actiontext

@rails/request.js

7.3: Check for Updates

For npm/yarn projects, check for available updates:

# Using npm
npm outdated @hotwired/turbo-rails @hotwired/stimulus @rails/actioncable @rails/activestorage 2>/dev/null

# Or check latest versions directly
npm view @hotwired/turbo-rails version 2>/dev/null
npm view @rails/actioncable version 2>/dev/null

7.4: Check Importmap Pins (if applicable)

If the app uses importmap-rails, check

config/importmap.rb

cat config/importmap.rb | grep -E 'pin.*turbo|pin.*stimulus|pin.*@rails' || echo "No importmap pins found"

To update importmap pins:

bin/importmap pin @hotwired/turbo-rails
bin/importmap pin @hotwired/stimulus

7.5: JS Dependency Summary

Include in the upgrade summary:

### JavaScript Dependencies

**Package Manager**: [npm/yarn/importmap/none]

| Package | Current | Latest | Action |
|---------|---------|--------|--------|
| @hotwired/turbo-rails | 8.0.4 | 8.0.12 | Update recommended |
| @rails/actioncable | 7.1.0 | 8.0.0 | Update with Rails |
| ... | ... | ... | ... |

**Recommended JS Updates:**
- Run `npm update @hotwired/turbo-rails` (or yarn equivalent)
- Run `npm update @rails/actioncable @rails/activestorage` to match Rails version

Imported: Step 8: Generate Upgrade Summary

Provide a comprehensive summary including all findings from Steps 1-7:

Version Information

• Current version: X.Y.Z
• Latest version: A.B.C
• Upgrade type: [Patch/Minor/Major]

Upgrade Complexity Assessment

Rate the upgrade as Small, Medium, or Large based on:

Key Changes to Address

List the most important changes the user needs to handle:

1. Configuration file updates
2. Deprecated methods/features to update
3. New required dependencies
4. Database migrations needed
5. Breaking API changes

Recommended Upgrade Steps

1. Update test suite and ensure passing
2. Review deprecation warnings in current version
3. Update Gemfile with new Rails version
4. Run

   bundle update rails

5. Update JavaScript dependencies (see JS Dependencies section)
6. DO NOT run

   rails app:update

   directly - use the selective merge process below
7. Run database migrations
8. Run test suite
9. Review and update deprecated code

Resources

• Rails Upgrade Guide: https://guides.rubyonrails.org/upgrading_ruby_on_rails.html
• Rails Diff: https://railsdiff.org/{current}/{target}
• Release Notes: https://github.com/rails/rails/releases/tag/v{target}

Imported: Step 9: Selective File Update (replaces

rails app:update

)

IMPORTANT: Do NOT run

rails app:update

9.1: Detect Local Customizations

Before any upgrade, identify files with local customizations:

# Check for uncommitted changes
git status

# List config files that differ from a fresh Rails app
# These are the files we need to be careful with
git diff HEAD --name-only -- config/ bin/ public/

Create a mental list of files in these categories:

• Custom config files: Files with project-specific settings (i18n, mailer, etc.)
• Modified bin scripts: Scripts with custom behavior (bin/dev with foreman, etc.)
• Standard files: Files that haven't been customized

9.2: Analyze Required Changes from Railsdiff

Based on the railsdiff output from Step 6, categorize each changed file:

config/initializers/new_framework_defaults_X_Y.rb

public/404.html

config/application.rb

bin/dev

9.3: Create Upgrade Plan

Present the user with a clear upgrade plan:

#### Imported: Step 10: Finalize Framework Defaults

After verifying the app works:

1. Review `config/initializers/new_framework_defaults_X_Y.rb`
2. Enable each new default one by one, testing after each
3. Once all defaults are enabled and tested, update `config/application.rb`:
   ```ruby
   config.load_defaults X.Y  # Update to new version

4. Delete the

   new_framework_defaults_X_Y.rb

   file

Imported: Upgrade Plan: Rails X.Y.Z → A.B.C

New Files (will be created):

• config/initializers/new_framework_defaults_A_B.rb
• bin/ci (new CI script)

Safe to Update (no local customizations):

• public/400.html
• public/404.html
• public/500.html

Needs Manual Merge (local customizations detected):

• config/application.rb └─ Local: i18n configuration └─ Rails: [describe new Rails changes if any]

• config/environments/development.rb └─ Local: letter_opener mailer config └─ Rails: [describe new Rails changes]

• bin/dev └─ Local: foreman + Procfile.dev setup └─ Rails: changed to simple ruby script

Skip (comment-only or irrelevant changes):

• config/puma.rb (only comment changes)

### 9.4: Execute Upgrade Plan

After user confirms the plan:

#### For New Files:
Create them directly using the content from railsdiff or by extracting from a fresh Rails app:

```bash
# Generate a temporary fresh Rails app to extract new files
cd /tmp && rails new rails_template --skip-git --skip-bundle
# Then copy needed files

Or use the Rails generator for specific files:

bin/rails app:update:configs  # Only updates config files, still interactive

For Safe Updates:

Overwrite these files as they have no local customizations.

For Manual Merges:

For each file needing merge, show the user:

1. Current local version (their customizations)
2. New Rails default (from railsdiff)
3. Suggested merged version that:
   • Keeps all local customizations
   • Adds only essential new Rails functionality
   • Removes deprecated settings

Example merge for

config/application.rb

# KEEP local customizations:
config.i18n.available_locales = [:de, :en]
config.i18n.default_locale = :de
config.i18n.fallbacks = [:en]

# ADD new Rails 8.1 settings if needed:
# (usually none required - new defaults come via new_framework_defaults file)

9.5: Handle Active Storage Migrations

After file updates, run any new migrations:

bin/rails db:migrate

Check for new migrations that were added:

ls -la db/migrate/ | tail -10

9.6: Verify Upgrade

After completing the merge:

1. Start the Rails server and check for errors:

   bin/dev  # or bin/rails server
   

2. Check the Rails console:

   bin/rails console
   

3. Run the test suite:

   bin/rails test
   

4. Review deprecation warnings in logs

Examples

Example 1: Ask for the upstream workflow directly

Use @skill-rails-upgrade to handle <task>. Start from the copied upstream workflow, load only the files that change the outcome, and keep provenance visible in the answer.

Explanation: This is the safest starting point when the operator needs the imported workflow, but not the entire repository.

Example 2: Ask for a provenance-grounded review

Review @skill-rails-upgrade against metadata.json and ORIGIN.md, then explain which copied upstream files you would load first and why.

Explanation: Use this before review or troubleshooting when you need a precise, auditable explanation of origin and file selection.

Example 3: Narrow the copied support files before execution

Use @skill-rails-upgrade for <task>. Load only the copied references, examples, or scripts that change the outcome, and name the files explicitly before proceeding.

Explanation: This keeps the skill aligned with progressive disclosure instead of loading the whole copied package by default.

Example 4: Build a reviewer packet

Review @skill-rails-upgrade using the copied upstream files plus provenance, then summarize any gaps before merge.

Explanation: This is useful when the PR is waiting for human review and you want a repeatable audit packet.

Best Practices

Treat the generated public skill as a reviewable packaging layer around the upstream repository. The goal is to keep provenance explicit and load only the copied source material that materially improves execution.

• Never overwrite without checking - Always check for local customizations first
• Preserve user intent - Local customizations exist for a reason
• Minimal changes - Only add what's necessary for the new Rails version
• Transparency - Show the user exactly what will change before doing it
• Reversibility - User should be able to git checkout to restore if needed
• Keep the imported skill grounded in the upstream repository; do not invent steps that the source material cannot support.
• Prefer the smallest useful set of support files so the workflow stays auditable and fast to review.

Imported Operating Notes

Imported: Key Principles

1. Never overwrite without checking - Always check for local customizations first
2. Preserve user intent - Local customizations exist for a reason
3. Minimal changes - Only add what's necessary for the new Rails version
4. Transparency - Show the user exactly what will change before doing it
5. Reversibility - User should be able to

   git checkout

   to restore if needed

Troubleshooting

Problem: The operator skipped the imported context and answered too generically

Symptoms: The result ignores the upstream workflow in

plugins/antigravity-awesome-skills-claude/skills/skill-rails-upgrade

metadata.json

ORIGIN.md

Problem: The imported workflow feels incomplete during review

Symptoms: Reviewers can see the generated

SKILL.md

Problem: The task drifted into a different specialization

Symptoms: The imported skill starts in the right place, but the work turns into debugging, architecture, design, security, or release orchestration that a native skill handles better. Solution: Use the related skills section to hand off deliberately. Keep the imported provenance visible so the next skill inherits the right context instead of starting blind.

Related Skills

• @server-management

  - Use when the work is better handled by that native specialization after this imported skill establishes context.

• @service-mesh-expert

  - Use when the work is better handled by that native specialization after this imported skill establishes context.

• @service-mesh-observability

  - Use when the work is better handled by that native specialization after this imported skill establishes context.

• @sexual-health-analyzer

  - Use when the work is better handled by that native specialization after this imported skill establishes context.

Additional Resources

Use this support matrix and the linked files below as the operator packet for this imported skill. They should reflect real copied source material, not generic scaffolding.

references

references/n/a

examples

examples/n/a

scripts

scripts/n/a

agents

agents/n/a

assets

assets/n/a

Imported Reference Notes

Imported: Error Handling

• If

  gh

  CLI is not authenticated, instruct the user to run

  gh auth login

• If railsdiff.org doesn't have the exact versions, try with major.minor.0 versions
• If the app is already on the latest version, congratulate the user and note any upcoming releases
• If local customizations would be lost, ALWAYS stop and show the user what would be overwritten before proceeding

Imported: Limitations

• Use this skill only when the task clearly matches the scope described above.
• Do not treat the output as a substitute for environment-specific validation, testing, or expert review.
• Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.