Rent the model, own the brain: a self-hosted agent that swaps LLMs like parts

What it does

Javis OS is a self-hosted agentic AI you run on a laptop or small VPS. It talks to 14 providers — Claude, ChatGPT, Grok, Gemini, OpenRouter, Ollama, any OpenAI- or Anthropic-compatible endpoint — and every brain gets the same toolkit: MCP tool calls, skills, background task queues, loops, reminders, and a voice-controlled dashboard. The pitch is that the model is a swappable part while everything you accumulate stays with you.

The interesting bit

The “Second Brain” is just a folder of markdown: MEMORY.md, one file per fact, an Obsidian-compatible wiki, skills and agents as SKILL.md and agents/*.md. Every learning pass is a git commit you can undo, and the whole brain syncs to a private repo. If Javis vanished tomorrow, your knowledge would still open in any text editor — which is the actual answer to chatbot lock-in.

Key highlights

• 14 providers, switchable from a dashboard page; multiple brains can run at once (strong model for chat, cheap one for background work, local Ollama for private notes)
• Conversations live in a local, full-text-searchable SQLite store regardless of which model answered
• Background work: loops, reminders, a Kanban task queue, and scheduled agents that report back
• Interfaces beyond the dashboard: voice, Telegram, Slack, WhatsApp, Zalo, and a CLI
• CLI engines (Claude Code, Codex, Grok, Antigravity) additionally get shell access, web fetch/search, and parallel sub-agents

Caveats

• The README itself warns that running Claude Pro/Max subscriptions in continuous background loops or on a VPS falls outside Anthropic’s “ordinary personal use” scope — account-locking risk is real and acknowledged
• Non-CLI providers only reach the outside world through Javis’s own tools, not shell or sub-agents
• A running instance can’t see CLIs installed after startup; you have to restart

Verdict

Worth a look if you’ve ever felt trapped by a year of chat history living in someone else’s format and want an agent that works while you sleep. If you just want a chat box, this is considerably more machine than you need.