SSH into a Runloop devbox and transfer files with SCP/rsync

Documented steps

1. Quick CLI connection: `rli devbox ssh <devbox-id>` — automatically retrieves credentials and provisions a temporary key file.
2. Programmatic key retrieval: Python `client.api.devboxes.create_ssh_key("dbx_1234567890")`; TypeScript `await client.api.devboxes.createSshKey('dbx_1234567890')`. Returns `url` (hostname), `ssh_private_key` (PEM), and `ssh_user` (Linux username). This retrieves the devbox's existing persistent keypair rather than generating a new one.
3. Authentication is ECDSA with the NIST P-256 curve only — password authentication is disabled. Each devbox gets a unique keypair at creation that persists across suspend/resume.
4. SSH traffic is wrapped in TLS to work across restrictive networks.
5. SSH sessions disconnect after 15 minutes of inactivity; add `ServerAliveInterval 60` to your SSH config to keep long sessions alive.
6. Copy files with SCP: `rli devbox scp dbx_abc123:/remote/file.txt ./local-file.txt`; sync directories with rsync: `rli devbox rsync dbx_abc123:/remote/dir/ ./local-dir/`.
7. For IDE integration (VSCode, JetBrains), generate an SSH config entry using the `--config-only` flag.
8. Docs: https://docs.runloop.ai/docs/devboxes/ssh