Plain Business English: Register Calibration

**plain-business-english** is an open-source plugin designed to calibrate the business English register of non-native writers, addressing the issue of writing that is “grammatically correct but tonally inappropriate.” It follows the principle of “State facts at their size,” aligning facts to their appropriate scale, using structured expression, de-inflating language, and conveying precise tonal temperature to correct excessive enthusiasm, over-apologizing, over-certainty, and redundant qualifiers. Suited for polishing English emails and reports, the plugin does not change the content; it only adjusts the nuance of expression to help users better meet business communication standards.