Upgrade Plan

Generate a comprehensive, phased upgrade plan tailored to this specific project.

Argument Parsing

Extract target versions from the arguments:

• ruby:X.Y.Z — required target Ruby version
• rails:X.Y — optional target Rails version (omit if Ruby-only upgrade)

Step 0: Load custom rules (if present)

Apply the "Load", "Schema check", and "Conflict detection" sections of $CLAUDE_PLUGIN_ROOT/skills/rules/references/rules-engine.md.

If .ruby-upgrade-toolkit/rules.yml is absent, set RULES_LOADED = false and proceed — the plan output is byte-identical to a version without this feature.