The Best Claude Prompts for Ghostwriting

Professional ghostwriting requires a rare skill: disappearing behind someone else's voice. Claude, Anthropic's AI model, stands out in this task for one precise reason — its ability to follow complex stylistic instructions and maintain tone consistency across long texts is superior to most tools available today. After testing hundreds of configurations on real projects (executive biographies, corporate newsletters, nonfiction books, LinkedIn posts for CEOs), I've identified the prompt patterns that produce publishable results with minimal human intervention.

In this guide, you'll find ready-to-use prompts, tested on Claude 3 Opus and Claude 3.5 Sonnet, for the most common professional ghostwriting use cases. I won't just teach you to copy-paste prompts: I'll explain the logic behind every choice, so you can adapt them autonomously to any client or context. Whether you're a freelance ghostwriter, content strategist, or professional who wants to delegate your own writing, this guide is your operational starting point.

Ready-to-Use Prompts for Ghostwriting with Claude

1. Narrative Voice Analysis and Replication

Analyze the following text samples written by [Client Name] and identify:
1. The predominant tone (formal/informal, authoritative/empathetic, etc.)
2. Average sentence length and paragraph structure
3. Recurring words or expressions that characterize their voice
4. Use of punctuation as a stylistic element
5. The type of examples or metaphors they tend to use

Text samples:
---
[PASTE HERE 3-5 TEXTS FROM THE CLIENT]
---

When finished, write a "voice profile" of 200 words that I could use as a brief to generate new content in their voice.

Why it works: This prompt leverages Claude's analytical capacity before its generative one. Separating analysis from production reduces stylistic hallucinations and creates a reusable reference document. The final "voice profile" becomes an artifact to attach to all subsequent prompts for that client.

Expected output: A structured analysis in five points followed by a synthetic paragraph that captures the essence of the client's style. Claude is particularly skilled at noticing punctuation and syntactic structure patterns that often escape superficial analysis.

Customization: Add a sixth point — "topics or subjects they systematically avoid" — for clients with very specific positioning or regulated industries.

2. LinkedIn Article in the Client's Voice

You are the ghostwriter for [Client Name], [professional title] in the [industry] sector.

Voice profile to follow:
[PASTE THE VOICE PROFILE GENERATED WITH PROMPT 1]

Write a LinkedIn article of 600-800 words on this topic: [TOPIC]

Specific instructions:
- Start with a personal hook based on this real experience of the client: [ANECDOTE/EXPERIENCE]
- Use first person naturally, not formally
- Include at least one credible piece of data or statistic (indicate the generic source, don't invent specific numbers)
- Close with an open-ended question that encourages comments
- Avoid: excessive bullet lists, empty motivational phrases, hashtags in the body text

Target tone: [authoritative yet accessible / vulnerable and authentic / pragmatic and direct — choose one]

Why it works: The prompt stacks three levels of contextualization — client identity, voice profile, negative instructions (what to avoid). Negative instructions are often more effective than positive ones with Claude: saying "avoid empty motivational phrases" produces cleaner results than saying "write authentically."

Expected output: A structured article with narrative hook, argumentative development, and call-to-action. Claude will tend to respect the word count with a 10% margin.

Customization: Replace "LinkedIn" with "newsletter" or "corporate blog" and add guidance on the specific audience (e.g., "readers are CFOs of small and medium-sized Italian companies").

3. Book Chapter or Long-Form Essay

You are ghostwriting a book titled "[BOOK TITLE]" for [Client Name].

Book context:
- Target audience: [description of ideal reader]
- Central thesis of the book: [the big idea the book wants to communicate]
- General tone: [examples of books with similar tone, e.g., "similar to 'Factfulness' by Rosling, but more anecdotal"]
- Already written chapters: [titles of previous chapters, if they exist]

Write Chapter [N]: "[CHAPTER TITLE]"

Required structure:
1. Opening with a story or scenario (approximately 300 words)
2. Central problem/tension of the chapter (200 words)
3. Development with 2-3 key concepts supported by examples (600 words)
4. Connection to the book's central thesis (150 words)
5. Closing with transition to the next chapter (100 words)

Client notes on this specific chapter:
[PASTE ANY NOTES, INTERVIEWS, OR TRANSCRIPTS FROM THE CLIENT]

Why it works: The five-section structure with specific word counts gives Claude a precise map to follow, reducing the narrative drift typical of long texts. The reference to similar books ("like Rosling but more anecdotal") is one of the most powerful techniques for calibrating stylistic register without writing pages of instructions.

Expected output: A chapter of approximately 1,350 words, structured and coherent. Claude excels particularly in narrative opening and thematic connection. Conceptual development sections might require revision if the examples provided aren't sufficiently specific.

Customization: Add a "Client phrases or quotations to integrate" section with material drawn from interviews or audio transcripts — Claude is very good at weaving authentic quotations into text naturally.

4. Professional Email or Corporate Communication

Ghostwrite this email on behalf of [Client Name], [role] at [company].

Context:
- Recipient: [who receives the email, their role and relationship with the sender]
- Email objective: [what it must achieve concretely]
- Relationship tone: [formal/informal, first contact/established relationship]
- Key information to communicate: [bulleted list of facts, numbers, decisions]
- What NOT to say: [sensitive information or framing to avoid]

Formal constraints:
- Maximum length: 200 words in the body (excluding greetings)
- Subject line: 3 versions to choose from
- Signature: [client's preferred formula]

Write the email and then provide a 2-3 line note explaining the main stylistic choices.

Why it works: Requesting "3 versions of the subject line" and a "note on stylistic choices" transforms Claude from passive executor to active consultant. This meta-reflection improves output quality and accelerates client review. The 200-word constraint forces synthesis, eliminating the filler typical of AI-generated corporate emails.

Expected output: A concise email with three subject line options and a brief explanatory note. Emails produced with this prompt tend to have a much higher client approval rate than generic prompts.

Customization: For sensitive communications (rejections, renegotiations, negative feedback), add: "Use a tone that preserves the relationship even though the message is difficult to receive."

5. Interview-to-Content: From Transcript to Publishable Text

Below is a transcript of an interview with [Client Name]. Your task is to transform it into a publishable article/post while maintaining the client's original ideas but improving clarity, structure, and flow.

Instructions:
- DO NOT invent information not present in the transcript
- You may reorganize the order of topics for better narrative coherence
- Remove verbal filler ("um", "like", "basically") and repetitions
- Preserve the client's characteristic expressions (those that make them recognizable)
- Final format: [blog article / LinkedIn post / newsletter / book excerpt]
- Target length: [X words]

Transcript:
---
[PASTE THE TRANSCRIPT]
---

After the text, add a section "Key Elements Preserved" where you list 3-5 original ideas or phrases from the client that you kept intact or nearly intact, and explain why you considered them central.

Why it works: The explicit constraint "DO NOT invent information" is essential with Claude when working on transcripts — without it, the model tends to "complete" the subject's reasoning with its own elaborations, compromising authenticity. The "Key Elements Preserved" section serves both as an audit trail and as a tool for educating the client on which parts of their speech are most powerful.

Expected output: Editorially clean text that preserves the speaker's original voice. Claude is particularly effective with 500-3,000 word transcripts. For longer transcripts, work in thematic sections.

Customization: If the client speaks in dialect or with very particular syntactic constructions, add: "These expressions must be preserved even if grammatically imperfect: [list]."

6. Tone Adaptation for Different Audiences

You have the following text written/approved by [Client Name]:

---
[ORIGINAL TEXT]
---

Rewrite this text in THREE versions, adapting the tone for these specific audiences:

Version A — For [audience 1, e.g., "institutional investors"]: tone [characteristics]
Version B — For [audience 2, e.g., "young professionals under 35"]: tone [characteristics]
Version C — For [audience 3, e.g., "mainstream media"]: tone [characteristics]

In each version keep unchanged:
- The data and facts
- The client's central position on the topic
- The client's name and role if mentioned

After the three versions, write a comparative table of the main stylistic differences between the versions.

Why it works: Requesting multiple versions in parallel is one of the most underrated techniques with Claude. The model not only produces quality variants, but the comparative table becomes a teaching tool for explaining to the client why certain communication choices work for certain audiences.

Expected output: Three distinct texts and a synthetic table. The differences between versions will be tangible and justified — not superficial reformulations.

Customization: Add "Version D — Short version for X (max 280 characters for Twitter/X)" to also produce social material in a single pass.

Prompt Engineering Tips for Ghostwriting with Claude

1. Use the "Voice Profile" as a System Document

The single most profitable investment in ghostwriting AI is creating a detailed voice profile for each client (see Prompt 1) and pasting it at the beginning of every session. Claude doesn't have persistent memory between conversations — so this 200-300 word document becomes your stylistic anchor. Save it in a text file and systematically copy-paste it.

2. Always Specify What to Avoid, Not Just What to Do

In ghostwriting, negative instructions are often more precise than positive ones. "Avoid sports metaphors" is more useful than "use original metaphors." "Don't start more than 20% of sentences with the explicit subject" calibrates rhythm better than "vary your syntactic structure." Build a customized list of prohibitions for each client.

3. Provide Rough Material, Not Polished Ideas

Claude produces better output when it receives raw transcripts, disorganized notes, or imperfect drafts rather than already-elaborated briefs. Raw material preserves the client's authentic voice; overly polished briefs tend to produce generic texts. Give Claude the messy problem — it's designed to structure it.

4. Use the "Show Me, Then Do" Principle

Before asking Claude to produce a long text, ask it to show you its plan: "Before writing, list the 5 main points you intend to cover in this chapter and explain how they connect to the central thesis." This intermediate step lets you correct course before investing time reviewing an already-generated text.

5. Iterate in Sessions, Not Single Prompts

Professional ghostwriters never deliver a first draft to the client. With Claude, adopt the same approach: use the first prompt to generate a draft, then refine with specific revision prompts ("Make the second paragraph more personal," "The ending sounds too motivational, rewrite it with a more pragmatic tone"). Multi-turn sessions produce significantly higher quality than single prompts.

Common Mistakes to Avoid

1. Asking Claude to "Write Like" Without Real Samples

"Write like a CEO" without actual CEO text samples almost always produces generic corporate jargon. Always provide real writing samples from the client or their industry. One authentic paragraph is worth more than ten pages of stylistic description.