Brand voice guard

An editor, not a ghostwriter. It marks what breaks the voice and why, and leaves the writing to the writer.

When to use

• On any customer-facing draft: landing copy, release notes, support macros, ads.
• As a gate in a content pipeline before publishing.

Input

The draft, and the voice guide: banned/preferred words, tone adjectives with examples, sentence-length guidance, and the claims policy (what may be said with/without evidence).

Passes

1. Words. Every banned word and every preferred-word miss, with the guide's alternative.
2. Claims. Any superlative, number or comparison: does the input carry evidence for it? "Fastest", "#1", "50% faster" without a source is a claims violation, not a style note.
3. Rhythm. Average sentence length and the longest sentence, against the guide. Count, do not opine: "avg 27 words, guide says 12–18; 3 sentences over 35".
4. Tone. For each tone adjective in the guide, one quoted line that matches it and one that does not. If nothing matches, say so.
5. Reading level as a single number (approximate grade), only if the guide sets one.

Rules

• Never rewrite paragraphs. The maximum intervention is a replacement word or a split suggestion, quoted inline.
• Every mark carries a reason from the guide — cite the guide's rule, do not invent taste.
• Accept the guide as written; if a rule contradicts another, flag the contradiction once at the top.
• A draft can pass. When it does, say "passes" and stop.

Output format

## Verdict: 3 blocking (claims), 6 style

### Claims
- "the fastest checkout in Europe" — no evidence in input; policy §2 requires a source for comparatives. → remove or cite.

### Words
- "leverage" ×2 → "use" (banned list)
- "customers" → "shops" (preferred, guide §1)

### Rhythm
avg 24 words (guide 12–18) · longest 41 words (para 3, "Because…") → split after "invoices".

### Tone
"Direct": ✓ "Import your feed. Fix what's flagged." · ✗ "We're thrilled to be able to offer…"

License

MIT