Why Step C Matters
Step A and Step B are only worth what you actually use them for. A System Prompt sitting in a doc you have to hunt for gets used twice, then forgotten - same problem, one layer deeper. Step C makes it permanent, so the whole system stops depending on you remembering to open a file.
These steps build on each other. You need your Tone of Voice Guide from Step A and your System Prompt from Step B before this one — if you’re missing either, start there and come straight back.
What’s Inside
Quick recap of how far you’ve come: in Step A you taught AI to write like you — your voice, bottled. In Step B you turned that into a System Prompt that gets near-perfect output from the first message. Step C is where it all clicks together: you package everything into a permanent AI assistant — one that never sleeps, never gets tired, and never breaks character. Today you stop using AI and start deploying it.
Three install options covered step by step:
- Claude Skill — the “always on” option. Claude automatically reaches for it whenever it recognises a writing task. Ask Claude to build the Skill file for you — no technical knowledge needed.
- Custom GPT — a dedicated tool at its own shareable link. Your team opens it, types a request, gets output in your voice. Zero training, and your updates reach everyone automatically.
- ChatGPT Custom Instructions — fastest to set up, most limited. Applies to every casual chat automatically. Use it for the highlights from your tone doc, not the whole thing.
Plus the adapt prompt (highlighted, copy-paste ready) that converts your Step B System Prompt into standing instructions for any of the three — and it all stays fully transferable between Claude, ChatGPT, and Gemini. Never locked in.
Who This Is For
Anyone who completed Step A and Step B and is ready to stop treating their System Prompt like a document they have to remember to open. Whether you’re working solo or with a team, this guide gives you a permanent setup that works every time — in whichever tool you actually use.
What Comes After
Your Tone of Voice is the first of five foundational documents in your AI Foundation — and with Step C done, it’s complete. Next up: the Master Business Prompt, which keeps your voice and layers in everything about your business — products, pricing, customers, offers — so every AI conversation starts already knowing your whole company, not just how you sound. Watch for the reel.