# split_window

Source: https://libtmux.org/en/go/latest/mcp/tools/split_window/

> Start a pane's configured process; accepts no command payload. Creates a pane whose configured process starts after the split.

MCP is in development

Server behavior and tool contracts may change. Tool availability depends on the server configuration.

Start a pane’s configured process; accepts no command payload. Creates a pane whose configured process starts after the split.

[All Go tools](../) · [JSON](../split_window.json) · [Source](https://github.com/libtmux/libtmux-go/blob/52968a3181c1c9e6d1b26c565d4b170968ae61c0/mcp/manifest_catalog.go#L466)

## Arguments

* `direction` optional · string

  below, above, left, or right

* `pane_id` required · string

  the pane id, such as %1

* `percent` optional · integer

  share of the split occupied by the new pane

* `start_directory` optional · string

  an absolute literal start directory

## Schemas

The schema defines required fields, nested values, defaults, and validation constraints.