Commands
Daily use
| Command | Description |
|---|---|
rat <lang> | Open REPL (auto-starts kernel) |
rat run <runtime> '<code>' | Execute code |
rat look <runtime> [--at SYM] | Inspect namespace |
rat tail <runtime> | Recent activity |
rat pick | Interactive kernel picker |
rat cancel <runtime> | Interrupt execution |
rat reset <runtime> | Clear namespace |
rat restart <runtime> | Fresh start |
Setup
| Command | Description |
|---|---|
rat install <lang> [<lang>...] | Set up runtimes + deps |
rat setup | Interactive wizard |
rat add <name> [dir] | Register named runtime |
rat remove <name> [--all] | Delete state entry |
Management
| Command | Description |
|---|---|
rat status [-v] | What’s running |
rat start <runtime> | Start a kernel |
rat stop <runtime> [--all] | Stop a kernel |
rat serve <name> [--http] | MCP server (for app builders) |
rat doctor [<lang>] | Diagnostics |
rat version | Version info |
rat update | Update rat |