PromptSharp › Daily briefs › Marketing › September 8, 2026

Marketing prompt of the day

September 8, 2026 · for Brand and growth marketers, agency strategists, content leads. One sharp, copy-paste prompt — free, every weekday.

You are a brand editor enforcing a voice guide. I will paste our voice guidelines and a draft. Produce:

A) The REWRITE — preserving every fact, claim, offer, and number exactly as given. Do not add, soften, strengthen, or invent claims; your job is voice, not substance.
B) A CHANGE LOG table: original phrase, revised phrase, and the specific voice rule that triggered the change. If you cannot cite a rule for an edit, do not make the edit.
C) VOICE GAPS: every place the guidelines gave you no guidance, each phrased as a question the team should settle and add to the guide.

My inputs: [PASTE: voice guidelines (traits, do/don't lists, example passages) + the draft to rewrite + where it will run]

Rules: Do not invent, estimate, or fabricate any statistic, benchmark, or performance figure — if a number is not in the material I give you, write "not provided" and flag it. Mark every claim I should verify in my analytics or source systems before it is published or presented. Never include customer personally identifiable information or client-confidential terms.

How to run “Brand-voice-locked rewrite with a change log”, step by step

The situation this prompt is built for: The draft is fine but it does not sound like the brand — and 'make it more on-voice' is not feedback anyone can act on. Make the edit auditable. Below is exactly what to feed it and what comes back — no model-specific tricks, it runs the same in any chat AI.

Why this structure works

'Doesn't sound like us' becomes fixable the moment every edit cites the rule behind it. The change log doubles as voice-guide QA — the recurring gap questions are exactly the rules your guidelines are missing, so the document improves every time the prompt runs.

On Pro, pro personalization preloads your actual voice guide so you paste only the draft — and the gap questions accumulate into guide updates.

When to use it — and when not to

Reach for it when

• The draft is fine but it does not sound like the brand — and 'make it more on-voice' is not feedback anyone can act on. Make the edit auditable.
• You need the output in a shape you can forward as-is — the fixed structure above is the point.

Skip it when

• You don’t yet have the source material — the prompt is built to refuse to fake it. Its own guardrail: “Do not invent, estimate, or fabricate any statistic, benchmark, or performance figure — if a number is not in the material I give you, write "not provided" and flag it.” With nothing to work from, you’ll get a list of “not provided” flags, which is honest but not useful. Collect the inputs first.
• The task is genuinely one sentence long — a structured prompt earns its overhead when the output has parts. For quick one-off questions, just ask.

Adapting today’s prompt for adjacent roles

“Brand-voice-locked rewrite with a change log” sits in the Content & Copy lane of the marketing pool. If your seat is one desk over, these are the same craft-move rebuilt for the neighbouring workflow — pulled from the same curated pool, each free in full at its permalink:

You are a marketing planner building a channel budget allocation. I will paste the budget, history, and constraints. Produce: A) AN ALLOCATION TABLE: channel, proposed…

You are a growth analyst decomposing a change in cost per acquisition. I will paste funnel metrics for the current and prior period. Produce: A) THE DECOMPOSITION: how…

You are a retention analyst building an early-warning system. I will paste behavioral and churn data. Produce: A) THE SIGNAL SHORTLIST: behaviors in MY data that…

Common failure modes (and the fixes)

• Failure: letting the model drift past the prompt’s own guardrail — “Do not invent, estimate, or fabricate any statistic, benchmark, or performance figure — if a number is not in the material I give you, write "not provided" and flag it.” Fix: keep that line in when you edit the prompt; it exists because this is exactly where outputs go wrong without it.
• Failure: letting the model drift past the prompt’s own guardrail — “Mark every claim I should verify in my analytics or source systems before it is published or presented.” Fix: keep that line in when you edit the prompt; it exists because this is exactly where outputs go wrong without it.
• Failure: letting the model drift past the prompt’s own guardrail — “Never include customer personally identifiable information or client-confidential terms.” Fix: keep that line in when you edit the prompt; it exists because this is exactly where outputs go wrong without it.
• Failure: accepting the first pass. Fix: reply with one line — “now cut everything that is generic to any company and keep only what is specific to mine” — the cheapest quality doubling available.

Quick answers

Is “Brand-voice-locked rewrite with a change log” free to use?

Yes — every weekday issue of the PromptSharp Marketing Brief publishes one full pool prompt free on the web, and it stays free in the archive. Pro is the daily full prompt set, personalization, and MCP delivery — not a paywall on this page.

Which AI model does this prompt work with?

Any of them. Every PromptSharp prompt is model-agnostic plain text — ChatGPT, Claude, Gemini, Copilot, or a local model. No plugins, no custom GPTs; paste and run.

How is the marketing prompt of the day chosen?

Deterministic rotation over the curated marketing pool — currently 51 prompts across 5 sections — the same single source the paid brief reads. Same date, same prompt: the archive never silently changes under you.

How do I get this in my inbox instead?

The capture form above — PromptSharp Marketing Brief status is honest: live briefs send every weekday; pre-launch verticals email their free list the day the email edition starts.

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