In one sentence
Open Computer Use is a self-hosted MCP server that gives any LLM a full Ubuntu sandbox — one isolated Docker container per chat session — with a live browser, an interactive terminal, code execution in bash/Python/Node/Java, and 13+ document skills. Yambr runs a managed instance you reach as an MCP tool server athttps://api.yambr.com/mcp/computer_use; artifacts are served from cu.yambr.com. You bring your own model provider — Yambr doesn’t resell inference.
What you can do with it
| Capability | Example prompt |
|---|---|
| Create a polished document | ”Write me a 5-page technical RFC in .docx with headings, tables, and tracked changes.” |
| Analyse a spreadsheet | ”Open this .xlsx, pivot by region, and chart monthly revenue.” |
| Build a landing page | ”Make a one-page site for a coffee shop. Use Tailwind. Show me the live preview.” |
| Drive a real browser | ”Log in to our staging site, click through the onboarding flow, and screenshot each step.” |
| Delegate to Claude Code | ”Clone this repo, run the tests, and open a PR with the fix.” — the sub-agent takes over with an interactive terminal |
Key differentiators
| Feature | Open Computer Use | Claude.ai (Claude Code web) | open-terminal | OpenAI Operator |
|---|---|---|---|---|
| Self-hosted | Yes | No | Yes | No |
| Any LLM | Yes (OpenAI-compatible) | Claude only | Any (via Open WebUI) | GPT only |
| Code execution | Full Linux sandbox | Sandbox (Claude Code web) | Sandbox / bare metal | No |
| Live browser | CDP streaming (shared, interactive) | Screenshot-based | No | Screenshot-based |
| Terminal + Claude Code | ttyd + tmux + Claude Code CLI | Built-in (Claude Code web) | PTY + WebSocket | N/A |
| Skills system | 13 built-in (auto-injected) + custom | Built-in skills + custom instructions | Open WebUI native (text-only) | N/A |
| Container isolation | Docker (runc), per chat | Docker (gVisor) | Shared container (OS-level users) | N/A |
What’s inside the sandbox
| Category | Tools |
|---|---|
| Languages | Python 3.12, Node.js 22, Java 21, Bun |
| Documents | LibreOffice, Pandoc, python-docx, python-pptx, openpyxl |
| pypdf, pdf-lib, reportlab, tabula-py, ghostscript | |
| Images | Pillow, OpenCV, ImageMagick, sharp, librsvg |
| Web | Playwright (Chromium), Mermaid CLI |
| AI | Claude Code CLI, Playwright MCP |
| OCR | Tesseract (configurable languages) |
| Media | FFmpeg |
| Diagrams | Graphviz, Mermaid |
| Dev | TypeScript, tsx, git |
Skills are model-agnostic. Write a skill once with Claude Code in the terminal and then use it with any model in the chat — the auto-injected system prompt exposes every enabled skill to every model.
Next
Architecture
How a request flows from the chat through the MCP server into the sandbox.
Yambr Platform
The four services that make up Yambr and what each is for.