Agent workspace · Coder Technologies, Inc.
Xum (formerly Mux)
Open-source coding agent multiplexer from Coder: its own agent loop with many model providers, isolated local, worktree or SSH workspaces, MCP servers, and a browser/server mode usable from a phone.
~/facts
- platforms
- macOSLinuxWindowsWebInstall page: macOS (DMG, Intel and Apple Silicon), Linux (AppImage), Windows installer in alpha (needs Git for Windows, WSL not supported); also an npm CLI (@coder/xum, Node 22+) and a server/browser mode with a responsive UI. Only main-branch macOS builds are signed and notarized.
- price
- FreeNo pricing found; AGPL-3.0 open-source app. Xum Gateway offers evaluation credits (if eligible); otherwise you supply your own model providers (seen 2026-10-20).
- source
- Open sourceLicence: AGPL-3.0
- github
- coder/xum 2.1k stars, seen 2026-10-20
~/features
- ✓ yes AI agents
- ✓ yes Multi-agent
- ✓ yes Git worktrees
- ✓ yes MCP
- ✓ yes Phone control
- ? not verified Mobile app
- ✓ yes SSH
- ? not verified SFTP
- ? not verified Tabs
- ? not verified Split panes
- ? not verified Cloud sync
- ? not verified Team sharing
✓ documented · – absent or not in its feature list · ? not verified
+ strengths
- Three workspace runtimes: local directory, git worktree, or remote execution over SSH, with a git-divergence overview
- Multi-model: Anthropic, OpenAI, xAI models plus Ollama and OpenRouter
- MCP servers are documented, and the ACP integration works with Zed, Neovim and JetBrains
- AGPL-3.0 source, macOS/Linux/Windows desktop plus a browser/server mode with a responsive mobile UI
! weak points
- Uses its own agent loop; the pages read do not show it hosting Claude Code or Codex CLIs
- Windows build is alpha, requires Git for Windows, and does not support WSL
- AGPL-3.0 license brings copyleft obligations for network-service modifications
- Renamed from Mux after a trademark concern, so older docs, the GitHub redirect (coder/mux), mux.coder.com links and the legacy package name still appear
~/who it is for
- best for
- Developers who want an open-source, model-agnostic agent workspace with worktree and SSH runtimes and browser access.
- look elsewhere if
- People who want a polished stable Windows app or to run vendor CLIs such as Claude Code inside the app.
~/sources
Checked 2026-10-20. Prices and features change; the vendor's page is the authority.
- xum.cdr.dev — description, AGPL-3.0, Coder copyright, browser/desktop, Xum Gateway credits
- xum.cdr.dev/install — platforms (macOS, Linux, Windows alpha), formats, rename note
- xum.cdr.dev/llms.txt — MCP Servers, Server Access (browser mode), ACP pages
- raw.githubusercontent.com/coder/xum/main/README.md — rename from Mux (trademark), worktree/SSH/local runtimes, multi-model, responsive mobile server UI, own agent loop
- api.github.com/repos/coder/xum — stars 2057, AGPL-3.0, v0.31.0 published 2026-10-09 (coder/mux redirects here)
Not verified
- Whether the desktop app has an official native iOS/Android app: only a responsive browser UI was seen, so mobile_app is null
- MCP page body not read; mcp true is based on the docs index entry 'MCP Servers' (Extend agent capabilities with MCP servers)
- Price outside Gateway credits not stated
- Web hint: the README says binaries for macOS and Linux only, while the install page also lists Windows alpha; install page was followed
- tabs/split_panes/scripting_or_api/team_sharing not verified