Lightning Talk: Teaching Claude Code to Upgrade Rails
summary
A Claude Code skill automates Rails upgrades by actually changing code, adding a gemfile.next symlink and letting a one environment variable switch select Rails 7.0 or 7.1 while running specs across versions. The skill insists on testing — no test suite no upgrade — provides repeatable steps for deprecation fixes, claims to handle Rails 2.3.2 to 8.1, and runs until the test suite passes. It is open source and optimized to use fewer tokens.
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