Learn Farsi: امروز پیش‌نویس توافق‌نامه به اتمام رسید. - Today, the draft of the agreement was completed.

This is a culminative compound verb using the light verb رسیدن (to arrive). The phrase به اتمام رسید literally means arrived at completion. In formal Farsi, verbs describing a process reaching its final state often use رسیدن paired with the preposition به (to) and a verbal noun like اتمام (completion).

Could I just use تمام شد instead of به اتمام رسید here?

Grammatically, yes, but تمام شد (finished or ended) is much more casual. Because this sentence is about a formal document—a draft agreement—the formal structure به اتمام رسید fits the professional, journalistic tone perfectly.

How is the word پیش‌نویس (draft) formed?

It is built from the prefix پیش (before or pre) and نویس, which is the present stem of نوشتن (to write). Literally, it means pre-written, which perfectly translates to a draft.

What is the role of the suffix نامه in توافق‌نامه?

While نامه by itself means letter, as a suffix it refers to formal documents, records, or books. Attached to the Arabic loanword توافق (agreement), it creates توافق‌نامه (agreement document or treaty). You have likely seen this in other words like گذرنامه (passport) or روزنامه (newspaper).