Ruby Prism Skill – CLI skill for understanding Ruby files

1 comments

• AndrewHampton 5 hours ago ago

  We've been experimenting with various skills and MCPs in our day-to-day Ruby development at Poll Everywhere. This is the internal skill that's been most useful for preserving the context window while letting agents explore Ruby code.

  It's a CLI wrapper around Ruby's Prism gem that lets the agent do this:

    $ prism -o app/models/user.rb
  
    User < ApplicationRecord [1-75]
      includes Agreeable
      includes Auditable
      has_many :polls
      has_many :questions, through: :polls
      has_many :votes
      has_many :reports, dependent: :destroy
      #audit_create [41-43]
      #allowed_to_participate_in?(poll) [45-66]
      #restricted_from_participation_in?(poll) [68-70]
      #recently_created? [72-74]
  
    $ prism -m 'recently_created?' app/models/user.rb
  
    === METHOD: recently_created? ===
    Lines 72-74:
      def recently_created?
        created_at.after?(5.minutes.ago)
      end
  

  The idea is to give the agent a token-efficient way to understand what's going on in Ruby code.