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Analyzes Rails applications and generates comprehensive upgrade reports with breaking changes, deprecations, and step-by-step migration guides for Rails 2.3 through 8.1.
Passed 15 of 18 test cases with the skill, and 13 of 18 without it.
and 1 more in the full report
4 fixed14 passed either way2 still failing2 broke
Tokens, turns and time describe resource use, not a dollar price.
This benchmark measured an earlier version of the skill.
A newer attempt on gemini-3.8-flash on 10/21/2026 did not produce a publishable comparison (not comparable). The snapshot above is the previously measured run.
One of 4 test cases the skill fixed. Same model, same prompt, with and without the skill.
When attempting to boot our application during a Rails upgrade, we hit a JS_COMPRESSOR_GEM_MISMATCH error due to Sprockets pinned to 2.x and terser/closure-compiler mismatches. Which specific reference resource should be consulted to fix this?
| Checked | Without skill | With skill |
|---|---|---|
| The guidance references the JS compressor Sprockets mismatch document. | Missed | Passed |
The instructions your model reads when the skill loads.
| Term | Meaning | Where |
|---|---|---|
| Workflow | One numbered unit of the upgrade flow, one file | workflows/<NN>-<name>-workflow.md |
| Step | A Step N header inside a workflow file | inside the workflow |
| Reference | Material loaded on demand: lookup tables, playbooks, conditional branches | references/<name>-reference.md |
No sub-steps: a "Step 4.1" is either two sequential steps or a conditional branch inside one step (### A. / ### B. headers). Refer to a whole workflow as Workflow NN; refer to a step as file path plus step, e.g. workflows/01-run-test-suite-workflow.md Step 4. Not used in headings: Stage, Phase, Sub-step, dotted step numbers.
next_rails gem. Covers setup, NextRails.next? code patterns, CI configuration, and post-upgrade cleanup. Must be installed for Workflow 04.
workflows/04-setup-next-rails-workflow.mdload_defaults updates with tiered risk assessment (Tier 1: low-risk, Tier 2: needs codebase grep, Tier 3: requires human review). Used as the final step after the Rails version upgrade is complete.This skill follows the proven FastRuby.io upgrade methodology:
next_rails gemtest cases passed, vs 13 / 18 without
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