# tmux_operation:outcome/0

- **Package:** libtmux_erlang
- **Language:** Erlang
- **Kind:** typealias
- **Source:** https://github.com/libtmux/libtmux-erlang/blob/d1b6308440cf9eb8f6647e7ae434bce60e849368/apps/libtmux_erlang/src/tmux_operation.erl#L34
- **Page:** https://libtmux.org/en/erlang/latest/reference/t-tmux_operation-outcome-0/

```
-type outcome() ::
          success | error | not_started |
          cancelled_before_send | unknown.
```

Command certainty, separate from resource cleanup. unknown must not trigger an automatic mutation retry.