The Forge uses the Anthropic API to analyze your writing. You need your own API key — calls go against your account, not anyone else's.
Get one at console.anthropic.com. Your key is stored only in your browser's localStorage and never sent anywhere except directly to Anthropic.
Paste or upload a draft. The Forge finds the weak points — structure, clarity, rhythm, word choice — then puts you to work on them, one at a time.
Targeted reps on individual writing habits — no draft required. Each sentence has one problem. You fix it. The gym adapts to your weak spots over time.