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A computer in a browser tab

Shiro is a Unix-like environment that runs entirely in the page: a shell, a persistent filesystem, git, Node and npm, and Claude Code, installed and ready to sign in. Nothing to install, and it's all still there when you come back.

Open Shiro Source on GitHub

First commands

# Claude Code: installs itself, opens a sign-in panel if needed
claude
claude --continue            # resume where you left off

# GitHub: sign in with a one-time code, then work as usual
gh auth login
gh repo clone you/project
gh repo create my-app --private --source . --push

# Let an outside agent drive this tab
remote start

help                         # everything else

What it's good for

Claude Code, no setup

The real Claude Code CLI runs in the tab. Sign in once with your Claude account, and it uses the current Opus model with adaptive thinking. claude --continue picks up your last conversation after a reload.

GitHub, public or private

gh auth login shows a code to approve on github.com. Clone, commit, pull, and push, including private repos, and publish a folder as a new repo in one command.

Remote agents

remote start gives a code that an MCP client (shiro-mcp) uses to run commands, read and write files, and search this page's console log, peer to peer over WebRTC.

Workspaces that stay

Files live in the browser's storage and survive reloads. Each subdomain, like music.shiro.computer, is its own separate workspace.

How it works

Filesystem. A POSIX-style tree stored in IndexedDB, with symlinks, permissions, and a recovery log.
Panes. Drag the tiny triangle in any pane's corner to split it: sideways for side by side, up or down for stacked. Each pane gets its own shell, and the layout comes back after a reload.
Shell. A bash-like interpreter: pipes, redirects, globs, functions, jobs, and hundreds of built-in commands.
Node and npm. Node's core modules are shimmed in the page; npm installs real packages from the registry.
Beyond JavaScript. WebAssembly and an x86-64 emulator run compiled tools like SQLite and Python.
The server. Serves the page and relays what a browser can't call directly: the Claude and GitHub APIs, git, and WebRTC signaling. It stores none of your files; those live only in your browser.