The role of tone of voice guidelines
Launch library · evergreen read

Tone of voice guidelines exist to answer a question that visual identity alone simply cannot answer on its own: not what the brand looks like, but how it actually sounds when it speaks, whether formal or casual, warm or direct, playful or restrained, and few organisations think to write any of it down until confusion has already set in.
Without a shared reference document to work from, different writers across an organisation naturally drift toward their own personal instincts, and a brand can end up sounding like several entirely different people depending on which department happened to write a given piece of copy that week.
Good guidelines describe more than a simple list of adjectives pinned to a wall somewhere. They show worked examples, contrast what the brand would plausibly say against what it clearly would not, and explain the underlying reasoning so writers can apply sound judgement in new situations.
The goal is not uniform, robotic sameness across every single message the organisation produces, but a recognisable character that holds steady even as the specific words change from one piece of writing to the next, even when the instinct is simply to wait and see.