# tmux.SessionOptionValues.MessageFormat

- **Module:** tmux.SessionOptionValues
- **Package:** github.com/libtmux/libtmux-go/tmux
- **Language:** Go
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-go/blob/52968a3181c1c9e6d1b26c565d4b170968ae61c0/tmux/option_generated.go#L2167
- **Page:** https://libtmux.org/en/go/latest/reference/tmux-sessionoptionvalues-messageformat/

```
tmux.SessionOptionValues.MessageFormat() -> OptionValue[string]
```

MessageFormat returns materialized "message-format" as [OptionValue] with value type OptionValue[string] from session option values; it does not query tmux. Available as STRING since tmux 3.7; set it with [Session.SetMessageFormat] or [GlobalSessionScope.SetMessageFormat].