# split_window

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

> Create a configured-process pane; path data is literalized before tmux expansion. Start a pane's configured process; accepts no command payload.

MCP is in development

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

Create a configured-process pane; path data is literalized before tmux expansion. Start a pane’s configured process; accepts no command payload.

[All C++ tools](../) · [JSON](../split_window.json) · [Source](https://github.com/libtmux/libtmux-cxx/blob/393d4b0ad666f18a6581f1eb281741a75a7503f0/apps/mcp/src/tool_catalog.cpp#L2590)

## Arguments

* `direction` optional · string

  vertical or horizontal.

* `paneId` required · string

  Stable pane to split.

* `startDirectory` optional · string

  Literal pane start directory.

## Schemas

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