# LibTmux.Control.start_option/0

- **Module:** LibTmux
- **Package:** libtmux
- **Language:** Elixir
- **Kind:** typealias
- **Source:** https://github.com/libtmux/libtmux-elixir/blob/66b9b1c3f3f3186428abdfda2c76f5cf87446710/lib/libtmux/control.ex#L49
- **Page:** https://libtmux.org/en/elixir/latest/reference/libtmux-control-start_option-0/

```
@type start_option() ::
        {:server, LibTmux.Server.t()}
        | {:session, {:existing, String.t()}}
        | {:lane, :host_qualified}
        | {:timeout, 1..600_000}
        | {:capacity
           | :metadata_capacity
           | :waiter_capacity, 1..256}
        | {:retention_ms, 1..600_000}
```

Explicit attachment policy and bounded startup settings; capacities count slots and timeouts use milliseconds.