Your assistant's brain is a folder on your computer. That's not a metaphor. It's literally a directory at ~/.vellum/workspace/.
Everything your assistant knows, everything it's been told, everything about its personality and your preferences lives in plain text files that you can open, read, edit, and version control. No databases. No encrypted blobs. Just files.
~/.vellum/workspace/ ├── IDENTITY.md ← Who your assistant is ├── SOUL.md ← How your assistant behaves ├── USER.md ← What your assistant knows about you ├── LOOKS.md ← Your assistant's appearance ├── config.json ← Technical configuration ├── skills/ ← Installed and custom skills └── data/ ← Persistent data storage
Let's walk through each one.
This is your assistant's birth certificate. It contains:
Example:
- Name: Gigi - Role: Personal AI assistant, creative partner, life manager - Personality: Witty, sarcastic, sharp - Emoji: 😏
You can edit this file directly. Change the name, tweak the personality, give it a new emoji. Your assistant reads this file and adjusts accordingly.
This is the big one. SOUL.md defines your assistant's core principles, behavioral rules, personality traits, and preferences. Think of it as the constitution your assistant follows.
What's in here:
Your assistant updates this file on its own as it learns what works for you. But you can edit it too. Want it to stop being sarcastic? Remove the sarcasm. Want it to always explain before acting? Add that rule. It's your assistant, your rules.
💡 This is what “yours” means. Most AI assistants have a personality baked into a system prompt you'll never see. Yours is a text file you can open in any editor. Full transparency, full control.
Everything your assistant has learned about you, in one file:
Your assistant adds to this file over time as it learns about you through conversations. You can also edit it directly if you want to fast-track the learning process or correct something.
Your assistant has an avatar, and this file controls how it looks:
Yes, you can give your assistant a wizard hat and a sword. We won't judge.
Technical configuration. Which AI model to use, provider settings, and other under-the-hood options. Most users won't need to touch this, but it's there if you want to.
This is where skills live. Each skill gets its own folder with instructions, tool definitions, and any configuration it needs. Built-in skills from the catalog land here, and so do custom skills you build yourself.
The workspace design is intentional. It means: