T5-R6 in five minutes

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Do not use a loop for a form with known fields.

Do not use a loop where a mistake is hard to undo and nobody is watching.

Do not use a loop to avoid writing the policy down.

A fixed script plus one model call can be the whole design.

The engineering note on agents says to start with the simplest thing that works. Confirm the page.

Looking up a library card by id is a function. Summarizing the card in one sentence can be one model call. Neither needs an open loop.