Overview

This guide walks you through building a “ghostwriter project” in Claude Sonnet 4 – Extended Thinking.

In ten minutes you’ll have a workspace that:

• Knows your vocabulary, pacing and structure
• Drafts posts or threads in your voice on demand
• Adapts to feedback and grows with your brand

The process is dead-simple:

1. Collect 10-20 reference posts (tweets, LinkedIn updates, newsletter excerpts—anything you actually wrote or want to emulate).
2. Create a Claude project, upload those references in Markdown, and drop in one prompt.
3. Converse with the model as if it were a senior writer on your team.

Everything else—tone, hooks, rhythm—comes from the examples you feed it.

No re-prompting, no SaaS fees, no guessing.

Why an AI Ghostwriter?

Traditional “AI content” tools churn out generic prose because they rely on one-off prompts with zero memory.

A Claude project, by contrast, offers:

• Persistent context – Every chat remembers the reference corpus you uploaded.
• Fast iteration loops – You can push drafts, get feedback, revise in seconds.
• Native tone matching – By learning from real samples it copies spacing, line breaks, even emoji usage if you keep them.