Seen the reel about "the Claude file US creators grow Reels with"? There is no magic file — but the trick behind it is real and it works.
What it is and who it's for
The claim in the reel: there's one secret file for Claude and the reach takes off by itself. In reality the secret isn't the file, it's the technique: you assemble the context once — proven hook formulas plus your style, niche, audience and CTA — and hand it to Claude. From then on it writes hooks and Reels scripts in exactly that style, every time. The most convenient home for this is Claude Projects, an official Anthropic feature: a project has its own instructions and a knowledge base with your files.
Who it's for: social media managers, creators and beginners who ship Reels/Shorts in batches and are tired of re-explaining their tone and format to the model every time. Claude is Anthropic's assistant (claude.ai).
Key capabilities
- Project instructions: you set the role, tone, hook formulas and rules — Claude holds them across every chat in the project.
- Project knowledge base: upload files (a hook library, a brand voice guide, transcripts of videos that performed) — Claude leans on those instead of guessing.
- A 200K-token context per project (roughly a 500-page book) — a large body of examples and rules fits.
- On paid plans — enhanced RAG over the knowledge base (expands capacity up to 10×).
- A separate chat history per project: Reels generations don't get mixed up with your other work.
Getting started in 5 minutes
- Go to claude.ai and create a project (Projects).
- In the project instructions paste the role + hook formulas + your niche, audience, tone and CTA (ready-made text is in the prompt booster below).
- Into the knowledge base upload 5-10 of your videos that performed (text/transcripts) and a style guide.
- In the project chat write: "10 hooks + a script on topic X" — Claude delivers in exactly your voice.
The context file is ready: from there you just swap the topic.
When to use it and when not to
✅ Use it if you ship Reels/Shorts in batches and want to lock in your style and hook formulas once instead of dictating them every time. ✅ Use it if you have 5-10 videos that performed — those are what you turn into the knowledge base. ❌ Skip it → the ready-made "Hook for Shorts" prompt is better if you just need 3 hooks right now with no project setup. ❌ Skip it → "Content plan for the week" is better if the job is a publishing plan, not the style of your scripts. ❌ Don't expect a "secret file from the US": reach comes from hook formulas + your style + testing, not from one particular set of words.
The honest price
The technique itself is free: project instructions and knowledge base uploads exist even on free Claude (limit — up to 5 projects). But on free the volumes and number of generations are capped, and enhanced RAG over the knowledge base is paid-plans-only. Claude Pro is $20/mo (or $17/mo billed annually) and lifts the free plan's 5-project cap; Max starts at $100/mo. Tag: free / paid — you can start for free, but a steady Reels pipeline is more comfortable on Pro. Check exact limits at claude.ai: Anthropic changes them.
Pitfalls
- The "file from the US" is marketing. There is no word combination that guarantees views; what works is proven hook formulas + your style + A/B tests.
- Garbage in, garbage out: weak examples in the knowledge base and Claude will average out their weakness.
- Don't copy other people's hooks verbatim: deceptive clickbait tanks completion rate and the algorithm punishes it — only promise what you'll actually show.
- Claude writes text, it doesn't shoot: editing, pacing, sound and being on camera are on you.
- The knowledge base goes to Anthropic's cloud — don't upload private material or other people's work you have no rights to.
- 200K of context isn't infinite: keep the knowledge base clean and relevant, not a dumping ground.
🤖 Prompt booster
"You are a scriptwriter for short vertical video (Reels/Shorts) with a track record of million-view reach. Niche:
. Audience: . Tone: . Goal of the videos: <follows / clicks / sales>. Hook rules (the first 2-3 seconds decide everything): break the pattern (pattern-interrupt), open a curiosity gap, promise a specific benefit — no deceptive clickbait. Language lively and conversational, short phrases made to be read aloud. The knowledge base holds my videos that performed and a style guide: stick to that voice. When I give you a topic, output: (1) 10 hooks of ≤ 12 words, marking the top 3 by strength; (2) a 40-60 second script as a table Time · Line · What's on screen, following the arc hook → retention → CTA; (3) 3 ideas for the on-screen cover text. Don't invent facts that aren't in the brief — ask."