lope-compare

name	lope-compare
description	Compare two files across every validator. Each model picks which file is better against explicit criteria (--criteria flag). Tally the picks; print the winner. Use for A/B review, before/after diff evaluation, migration decisions, bake-offs. Criteria is mandatory in the prompt — 'better' is never model-invented.

Lope Compare

Send two file contents + explicit evaluation criteria to every validator. Each one picks A or B. Tally the picks; print the winner.

This is vote specialized for two-file A/B comparison with file content embedded in the prompt.

Invocation

Two paths:

1. Explicit slash command. User types /lope-compare auth_old.py auth_new.py. Route to lope compare. Pass --criteria "..." if the user gave one.

2. Natural language. User says:

   • "Which file is better — A or B?"
   • "Compare this old version to the new one"
   • "Run a bake-off between these two implementations"
   • "Before/after review across models"

   Infer the two file paths from the conversation context and invoke lope compare <a> <b>. If the user hinted at criteria ("for security", "for performance", "for ergonomics"), pass --criteria.

Command shape

lope compare <file_a> <file_b>                           # default criteria
lope compare <a> <b> --criteria "security and readability"
lope compare <a> <b> --criteria "correctness, performance, ergonomics"
lope compare <a> <b> --json                              # machine-readable tally
lope compare <a> <b> --validators claude,opencode
lope compare <a> <b> --timeout 120

Default criteria: "correctness and clarity". Always pass --criteria if the user hinted at specific dimensions — it's what keeps "better" from being model-invented.

Output shape

Lope compare:
  A: auth_old.py  (2341 chars)
  B: auth_new.py  (1887 chars)
  Criteria: correctness and readability
  Validators: claude, gemini, pi

━━━ claude ━━━
  chose: B
━━━ gemini ━━━
  chose: B
━━━ pi ━━━
  chose: A

Tally:  A=1  B=2

Winner: B  (auth_new.py)

Ties print "No winner — tie" and the user decides.

Design constraints

• Criteria opacity fix (pi design review, v0.5.0): --criteria is injected into every validator's prompt explicitly so "better" is bound to real dimensions, not each model's private interpretation. This is the single most important knob.
• File size caveat. Both files ride inline in the prompt. Large files multiply tokens and can exceed context windows — affected validators surface as [UNPARSEABLE], the rest still vote. For huge artifacts, pre-extract the relevant sections.
• Non-text files not supported. Binary, PDF, image — not handled. Use describe tools for those.

When NOT to use compare

• One file to review → /lope-review.
• 3+ options → /lope-vote with --options A,B,C.
• Open-ended "which is best?" without concrete files → /lope-ask.

Cost

Two full file contents × N validators. Long files multiply this fast. --validators claude,gemini caps the fan-out.