> ## Documentation Index > Fetch the complete documentation index at: https://claude.com/docs/llms.txt > Use this file to discover all available pages before exploring further. # Command line settings > Reference for the claude-science command: every subcommand, the serve flags, the single-use login link, and the two environment variables Claude Science reads. Reference for the claude-science command: every subcommand, the serve flags, the single-use login link, and the two environment variables Claude Science reads.\ claude-science serve starts Claude Science and opens the web app in your browser at a single-use login link. Everyday use is that one command. The others manage the running program: they mint login links, report status, follow logs, install updates, and merge data directories. ## Commands | Command | What it does | | ----------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | `claude-science serve` | Start the background program and open the web app in your browser at a single-use login link. One runs per data directory; Ctrl-C stops it. | | `claude-science open` | Mint a fresh login link from the running program and open it in your browser. | | `claude-science url` | Print a fresh login link alone on standard output and nothing else. | | `claude-science status` | Print whether the program is running, the version, and the port, as JSON. | | `claude-science logs` | Print the newest log file from the data directory. `--tail` follows it live. | | `claude-science stop` | Stop the program cleanly. | | `claude-science update` | Check for and install an update. `--check` only reports; --to `` installs a specific version, which is also how you roll back. Updates are signature-verified and replace the binary atomically. | | `claude-science import` `` | Merge another data directory, or its database file, into this one. | | `claude-science --version` | Print the version. | | `claude-science` `` --help | Print help for any command. | `import` has no preview and no undo. Back up the data directory before you run it; running the same import a second time is safe. ## Global flags These two work on every command. | Flag | Default | What it does | | -------------------- | ------------------------------- | ------------------------------- | | `--data-dir` `` | `~/.claude-science` | The data directory to use. | | `--config` `` | `~/.claude-science/config.toml` | The configuration file to read. | ## The login link When serve starts, it prints a line of the form `Web UI -> http://localhost:/?nonce=...`. The nonce is a one-time password: it signs one browser tab in and then expires, about three minutes after it is printed. The signed-in tab stays signed in until you restart the program.\ You never need to keep a link. claude-science open mints a fresh one and opens it in your browser whenever you want to sign in again. For a machine you reach over SSH, claude-science url prints a fresh link alone on standard output: run it there, then open the printed link through your tunnel. The app listens on 127.0.0.1 unless you change --host, so it is reachable only from your own machine. ## Flags for serve | Flag | Default | What it does | | ------------------------- | --------- | ------------------------------------------------------------------------------------------------------------------------------- | | `--port` `` | `8000` | The port the web app is served on. 0 picks a free port. | | `--no-browser` | off | Do not open a browser. url prints a login link any time you want one. | | `--detached` | off | Run in the background. Implies --no-browser. | | `--no-auto-update` | off | Do not check for or install updates. For a pinned or centrally managed install. | | `--host` `
` | 127.0.0.1 | The address the app listens on. Anything else exposes the app to your network; prefer an SSH tunnel. | | `--base-path` `` | unset | Serve the app under a URL prefix behind a reverse proxy. | | `--allow-origin` `` | unset | An extra browser Origin allowed to connect; repeat the flag for more than one. It does not change which sites Claude can reach. | | `--sandbox-port` `` | port + 1 | The separate origin that previews of generated HTML are served from, so a previewed page cannot read your session. | ## Dangerous flags `--dangerously-no-sandbox` runs code with full read and write access to your home directory and an unrestricted network. `--dangerously-skip-approvals` approves every permission card automatically, for everything, until you restart without the flag; questions addressed to you still appear. Neither belongs in everyday use. ## Environment variables `DO_NOT_TRACK`, set to any value, turns usage analytics off. It is the same switch as `disable_telemetry = true` in the configuration file. `GITHUB_TOKEN` is optional and is used only against `api.github.com`, to lift the rate limit when you install a skill from a GitHub repository. Settings belong in the configuration file; an environment variable never overrides one. ## See also Connect an SSH host and run jobs on it.