Builder and Challenger

Every card has two roles. Plyloft gives them to the official command-line tools you already use, signed in with your own plans.

Builder

Writes the change in the card’s own copy of the repository, in a real terminal you can open at any time. Gets every finding from the review and fixes it, or explains why not.

Challenger

Reads the build read-only: it can look at everything and change nothing. Anchors its findings on the lines they name, follows your repository’s skills and says which.

Who plays which role

By default the Builder is Claude (Claude Code) and the Challenger is Codex, the other vendor. You can swap them per card, or set your default in Settings › This Mac › Claude and Codex › Who builds.

You have	Builder	Challenger
Claude and ChatGPT plans	Claude or Codex	the other one
Only a Claude plan	Claude	Claude, same vendor
Only a ChatGPT plan	Codex	Codex, same vendor

When the Challenger is the same vendor as the Builder, the card says so, for example Claude · same vendor · reviewing.

Tip

Two vendors give the more independent review: a model asked to check its own work tends to agree with itself. One plan is enough to use every feature.

On the card

The card’s properties name both roles at all times:

• Builder — the vendor building this card.
• Challenger — the reviewer and its verdict, for example Codex · nothing blocking or Codex · changes requested.

While either one works, the card’s Now callout and the sidebar say who it is: Claude · building · 4m, Codex · reviewing · 2m, Claude · waiting for you.

Your plans, not ours

Plyloft starts claude and codex in a terminal on your computer, the same as typing them yourself. It uses no API key and never sees your credentials. Usage counts toward your plan’s limits as usual.