# LibTmux.FSharp.Pane.readSince

- **Module:** LibTmux.FSharp
- **Package:** LibTmux.FSharp
- **Language:** F#
- **Kind:** function
- **Source:** https://github.com/libtmux/libtmux-dotnet/blob/cf34b255c896d19a97e7d7fabea58609c916012d/src/LibTmux.FSharp/Hierarchy.fsi#L215
- **Page:** https://libtmux.org/en/fsharp/latest/reference/libtmux-fsharp-pane-readsince/

```
val readSince:
        cancellationToken: CancellationToken ->
        position: PaneOutputPosition option ->
        pane: LibTmux.Pane ->
            Task<PaneOutputSince>
```

Reads what the pane printed since a position, and where this read finished.

The core's <c>Pane.ReadOutputSinceAsync</c>. Start with <c>None</c>, which returns no lines and a
position; pass each result's <c>Position</c> to the next read. <c>LinesMissed</c> says scrollback
dropped output first. This is the MCP server's <c>capture_since</c>.

## Parameters

- `cancellationToken` (`CancellationToken`)
- `position` (`PaneOutputPosition option`)
- `pane` (`LibTmux.Pane`)

## Raises

- [`System.ArgumentException`](https://learn.microsoft.com/dotnet/api/system.argumentexception): The position came from another pane.
- [`LibTmux.TmuxPaneException`](/en/csharp/latest/reference/libtmux-tmuxpaneexception/): The pane runs a different program than when the position was taken, or a read without a position found its program exited.
- [`LibTmux.TmuxObjectNotFoundException`](/en/csharp/latest/reference/libtmux-tmuxobjectnotfoundexception/): tmux no longer has the pane.