Brand and tone of voice: a brand book AI can actually use

Here are 10 pieces of copy I wrote for my brand. They're examples
of how I want to sound.

[paste the texts, each separated by a line of --- and labeled by
channel, e.g. "--- newsletter ---", "--- customer reply ---"]

Describe my writing style so that someone else could write in it
from your description. Do NOT evaluate quality, do not praise,
do not suggest improvements. Just describe what's actually in the
texts, and give a concrete example from a specific text for every
observation.

Break it into:
1. Length and rhythm: average sentence length, ratio of short to
   long, paragraph handling, where a one-sentence paragraph is used
2. Vocabulary: 20 words and phrases that repeat across the texts;
   flag separately any words a competitor probably wouldn't use
3. Address and person: formal/informal "you", we/I, how customers
   are referred to
4. Formality on a scale of 1-10, and exactly what shows it
5. Punctuation and typography: exclamation points, ellipses,
   parentheses, dashes, emoji, capitalization
6. How the texts open and close (list the actual openings and
   closings)
7. What arguments are used: numbers, stories, authority, experience
8. Humor: is it there, what kind, where does it never show up

At the end, write 5 sentences that would explain my style to
someone who's never read any of it.

You have my style description from the previous response and my
10 texts.

Put together a list of what NEVER appears in my writing — and what
could appear there if someone else in my field had written it.

Return four lists:
1. Words and phrases that don't appear in my texts but are common
   in [industry] (marketing filler, corporate boilerplate)
2. Constructions I avoid (e.g. passive voice, sentences running
   three lines, rhetorical questions in the opening)
3. Typographic habits I don't use (exclamation points, emoji,
   all caps, ellipses)
4. Topics or claims I never resort to (comparing to competitors,
   unsupported promises, scare tactics)

For each item, write what I use instead in my texts — a concrete
example from the source. Where you don't see a replacement, say so.

Here's a description of my writing style:

[paste the description from the first prompt and the banned list
from the second]

Write three texts I've never written, based on it:
1. A short post for [channel] about [topic] (under 100 words)
2. A reply to a customer complaining about [situation]
   (under 150 words)
3. An opening paragraph for an article about [topic]

Stick to the description, not a generic idea of "good writing."
Under each text, note which rules from the description you used
and where you weren't sure, because the description doesn't
cover it.

Build a brand book for writing our brand's copy from these inputs.

Inputs:
- style description from the analysis of my texts: [paste]
- list of banned items: [paste]
- what we do: [3 sentences]
- our values: [list them]
- our audience: [describe the groups]
- channels we write for: [list them]

Requirements for the document:
- structure: who we are, values in writing, audience, tone of
  voice, banned phrases, good/bad examples, channel variants
- every rule must be checkable: someone can look at a text and
  say definitively whether the rule was followed
- no adjectives without a translation into behavior — when you
  write "friendly," it must immediately be followed by
  "which means…"
- every value gets a sentence: "in our writing, this means…"
- banned phrases as a table: don't write | write instead | why
- max 6 pages, written for someone starting here tomorrow

Where you're missing an input, write a separate line: QUESTION:
[what you need to know] — don't guess.

From the brand book we have tone rules and a list of banned
phrases:

[paste the rules and bans section]

Produce 20 good/bad example pairs. For each pair:
- the same message written twice
- make the WRONG version realistic — how an average copywriter
  in our field would actually write it, not a caricature
- the RIGHT version following our rules
- one sentence on which rule is being broken or followed

Cover these situations: welcome email, delay notice, claim
rejection, product description, feature announcement, reply to
a negative review, event invite, apology for a mistake, discount
offer, article closing with a call to action.

Pull the subject matter from our field: [field], product
[product].

In this project we write and check copy for the brand [brand].
The brand book is uploaded as the file brand-book.md — it's
binding.

Rules for every response:
- Before you start writing, check tone against the "Tone of
  Voice" and "Banned Phrases" sections. Don't use a banned phrase
  even in paraphrase.
- If you're not sure how the brand would say something, don't
  guess — ask, or write two variants and flag how they differ.
- Never invent facts about the product, pricing, deadlines, or
  results. Where you're missing a figure, write [FILL IN: what].
- Match the channel variant to where the text is going. If I
  don't state a channel, ask.
- Skip opening pleasantries like "happy to help" — go straight
  into the text.

Check the attached text against our brand book.

The text is going on: [channel]. Target audience: [group].
Purpose of the text: [inform / sell / apologize / invite].

[paste the text]

Don't rewrite the whole text. Return a table of findings:
location in text | what it violates | which brand book rule |
suggested fix

Check in this order:
1. Banned phrases — including paraphrased or inflected forms
2. Tone: person, formality, sentence length, rhythm
3. Channel variant: does the length and structure fit [channel]?
4. Audience: are there terms [group] wouldn't understand, or
   conversely, explanations of things they already know?
5. Promises and claims: is there anything we're promising
   without backing it up?

At the end, give an overall verdict in one sentence: PASSES /
MINOR EDITS / REWRITE — and for the last two, name the biggest
problem.

We have this tone of voice:

[paste the Tone of Voice section from the brand book]

We write for these channels: [list them, e.g. website, newsletter,
LinkedIn, Instagram, support replies, sales emails, product
descriptions].

For each channel, write a channel variant:
- length: typical text length and paragraph length
- structure: how it opens, how it closes, what never belongs
  there
- what from our tone gets amplified and what gets toned down
  (and why)
- 3 typical mistakes we tend to make on this channel
- one sample sentence in our tone showing what an opening on
  this channel would look like

The tone must stay recognizably the same — don't invent new
personalities for individual channels. The difference is in
volume, not voice.

Here are 15 of our existing texts from different channels, plus
our brand book.

[paste the texts, each labeled with channel and date]

Do a consistency audit:
1. Rank the texts by how far they drift from the brand book
   (most drifted first), with a score from 1-10 and the main
   problem in one sentence for each
2. Find patterns: which mistakes repeat across texts, not
   one-off exceptions
3. Split mistakes into: writer error × gaps in the brand book
   (spots where the document is silent and everyone handles it
   their own way)
4. Suggest a fix order by impact-to-effort ratio

Be specific on point 3 — I want to know exactly what needs to
be added to the document so this stops happening.

Prepare a brief for a freelance copywriter. You have our brand
book.

Text I need: [type of text], channel [channel], length
[word count], deadline [date].
Topic and facts: [list what the text needs to cover]
Goal: [what the reader should do or know after reading]
Audience: [group from the brand book]

Put together a brief that includes:
- a clear split: what's fixed vs. where the writer has freedom
- which brand book sections matter most for this text
- 3 examples of our existing texts that are the closest stylistic
  match (pick the type based on the brand book, I'll add the
  specific pieces)
- what "done" means: 5 criteria the text will be accepted against
- what the writer should avoid — pull out the banned phrases
  from the brand book most likely to show up in this type of
  text

The brief has to make sense to someone who's never heard of us.

We have a brand book and work with an agency. Put together a
one-page "How to write for us" document to attach to the order.

It must include:
- the 10 most important rules of our tone, ranked by how often
  they get broken
- a table of banned phrases (only the most common, max 15 rows)
- 5 good/bad example pairs
- the check the writer should run before delivery
- what counts as grounds for sending a text back

Write it for a professional, not a beginner — concise, no
explaining the obvious. It needs to fit on one A4 page.

We're doing the quarterly brand book revision. I'm attaching:
- the current brand book
- 10 texts we published over the past quarter (chosen as
  representative, not our best work)
- open questions we've collected over the quarter: [list them]

Go through it and return:
1. Where reality diverges from the document — rules we're
   systematically breaking. For each one, say whether the mistake
   is in the texts, or the rule is unsustainable and should
   change.
2. Which good/bad examples are now outdated (referring to
   products, channels, or situations we no longer deal with)
3. Phrases that have crept into our texts and should be added
   to the banned list — pull them from the attached texts
4. Answers to the open questions: for each, propose a rule
   written in the same style as the rest of the document
5. What's redundant in the document: rules nobody has ever
   broken or needed, because they're obvious

Don't rewrite the document, return a list of proposed changes
with reasoning.

Compare the old and new versions of the brand book:

OLD:
[paste]

NEW:
[paste]

Write a message for the team and outside collaborators:
- what changed, ranked by impact on everyday writing
- one sentence why, per change
- what it means in practice: "from now on, instead of X we write Y"
- what stays the same (just a list, so people don't have to read
  the whole document)

Keep it under 300 words, written in our tone per the new version.