{
  "name": "split_window",
  "wireName": "split_window",
  "source": {
    "repo": "tmux-python/libtmux-mcp",
    "revision": "4daddc0dfca96c43bf521d818bf91564e1434760",
    "extractedRevision": "4daddc0dfca96c43bf521d818bf91564e1434760",
    "file": "src/libtmux_mcp/tools/window_tools.py",
    "line": 512
  },
  "description": "Split a tmux window to create a new pane.\n\nCreates a new pane by splitting an existing one. Use direction to choose\nabove/below/left/right. Returns the new pane's info including its pane_id.",
  "schemaStatus": "runtime",
  "inputSchema": {
    "additionalProperties": false,
    "properties": {
      "direction": {
        "anyOf": [
          {
            "enum": [
              "above",
              "below",
              "left",
              "right"
            ],
            "type": "string"
          },
          {
            "type": "null"
          }
        ],
        "default": null,
        "description": "Split direction."
      },
      "environment": {
        "anyOf": [
          {
            "additionalProperties": {
              "type": "string"
            },
            "type": "object"
          },
          {
            "type": "string"
          },
          {
            "type": "null"
          }
        ],
        "default": null,
        "description": "Per-process environment as a mapping or JSON object string. Values do\nnot modify the tmux session environment. Each item becomes a tmux\n``-e`` launch option. Values may be visible to host process inspection\nin the tmux client argv during launch and in the child environment\nafterward; MCP audit redaction does not hide either surface. Pass\ncredential references, not literal credentials."
      },
      "pane_id": {
        "anyOf": [
          {
            "type": "string"
          },
          {
            "type": "null"
          }
        ],
        "default": null,
        "description": "Pane ID to split from. If given, splits adjacent to this pane."
      },
      "session_id": {
        "anyOf": [
          {
            "type": "string"
          },
          {
            "type": "null"
          }
        ],
        "default": null,
        "description": "Session ID (e.g. '$1')."
      },
      "session_name": {
        "anyOf": [
          {
            "type": "string"
          },
          {
            "type": "null"
          }
        ],
        "default": null,
        "description": "Session name."
      },
      "shell": {
        "anyOf": [
          {
            "type": "string"
          },
          {
            "type": "null"
          }
        ],
        "default": null,
        "description": "Shell command to run in the new pane."
      },
      "size": {
        "anyOf": [
          {
            "type": "string"
          },
          {
            "type": "integer"
          },
          {
            "type": "null"
          }
        ],
        "default": null,
        "description": "Size of the new pane. Use a string with '%%' suffix for\npercentage (e.g. '50%%') or an integer for lines/columns."
      },
      "socket_name": {
        "anyOf": [
          {
            "type": "string"
          },
          {
            "type": "null"
          }
        ],
        "default": null,
        "description": "tmux socket name."
      },
      "start_directory": {
        "anyOf": [
          {
            "type": "string"
          },
          {
            "type": "null"
          }
        ],
        "default": null,
        "description": "Existing directory to start in. ``~`` expands; a relative path\nresolves against the MCP server process's directory."
      },
      "suppress_persistent_history": {
        "default": false,
        "description": "Whether to suppress persistent history for the spawned shell. Defaults\nto False for MCP and direct Python calls. This per-call option does not\ninherit LIBTMUX_SUPPRESS_HISTORY. Startup files may override these\ncontrols.",
        "type": "boolean"
      },
      "window_id": {
        "anyOf": [
          {
            "type": "string"
          },
          {
            "type": "null"
          }
        ],
        "default": null,
        "description": "Window ID (e.g. '@1')."
      },
      "window_index": {
        "anyOf": [
          {
            "type": "string"
          },
          {
            "type": "null"
          }
        ],
        "default": null,
        "description": "Window index within the session."
      }
    },
    "type": "object"
  },
  "outputSchema": {
    "description": "Serialized tmux pane.",
    "properties": {
      "is_caller": {
        "anyOf": [
          {
            "type": "boolean"
          },
          {
            "type": "null"
          }
        ],
        "default": null,
        "description": "MCP caller identity for this pane. ``True`` when the pane matches the caller's ``TMUX_PANE`` *and* lives on the same tmux socket as the caller's ``TMUX`` (verified via socket realpath); ``False`` otherwise, including the case where the pane id matches but the socket does not or cannot be proven to; ``None`` when the MCP process is not running inside tmux at all."
      },
      "pane_active": {
        "anyOf": [
          {
            "type": "string"
          },
          {
            "type": "null"
          }
        ],
        "default": null,
        "description": "Active flag ('1' or '0')"
      },
      "pane_at_bottom": {
        "anyOf": [
          {
            "type": "boolean"
          },
          {
            "type": "null"
          }
        ],
        "default": null,
        "description": "True when the pane touches the window's bottom edge."
      },
      "pane_at_left": {
        "anyOf": [
          {
            "type": "boolean"
          },
          {
            "type": "null"
          }
        ],
        "default": null,
        "description": "True when the pane touches the window's left edge."
      },
      "pane_at_right": {
        "anyOf": [
          {
            "type": "boolean"
          },
          {
            "type": "null"
          }
        ],
        "default": null,
        "description": "True when the pane touches the window's right edge."
      },
      "pane_at_top": {
        "anyOf": [
          {
            "type": "boolean"
          },
          {
            "type": "null"
          }
        ],
        "default": null,
        "description": "True when the pane touches the window's top edge. tmux accounts for ``pane-border-status`` here, so the top row may be 1 instead of 0 when the status bar is at the top."
      },
      "pane_bottom": {
        "anyOf": [
          {
            "type": "integer"
          },
          {
            "type": "null"
          }
        ],
        "default": null,
        "description": "Bottom edge row (inclusive), window-relative."
      },
      "pane_current_command": {
        "anyOf": [
          {
            "type": "string"
          },
          {
            "type": "null"
          }
        ],
        "default": null,
        "description": "Running command"
      },
      "pane_current_path": {
        "anyOf": [
          {
            "type": "string"
          },
          {
            "type": "null"
          }
        ],
        "default": null,
        "description": "Current working directory"
      },
      "pane_height": {
        "anyOf": [
          {
            "type": "string"
          },
          {
            "type": "null"
          }
        ],
        "default": null,
        "description": "Height in rows"
      },
      "pane_id": {
        "description": "Pane ID (e.g. '%1')",
        "type": "string"
      },
      "pane_index": {
        "anyOf": [
          {
            "type": "string"
          },
          {
            "type": "null"
          }
        ],
        "default": null,
        "description": "Pane index"
      },
      "pane_left": {
        "anyOf": [
          {
            "type": "integer"
          },
          {
            "type": "null"
          }
        ],
        "default": null,
        "description": "Left edge column, 0-based and window-relative."
      },
      "pane_pid": {
        "anyOf": [
          {
            "type": "string"
          },
          {
            "type": "null"
          }
        ],
        "default": null,
        "description": "Process ID"
      },
      "pane_right": {
        "anyOf": [
          {
            "type": "integer"
          },
          {
            "type": "null"
          }
        ],
        "default": null,
        "description": "Right edge column (inclusive), window-relative."
      },
      "pane_title": {
        "anyOf": [
          {
            "type": "string"
          },
          {
            "type": "null"
          }
        ],
        "default": null,
        "description": "Pane title"
      },
      "pane_top": {
        "anyOf": [
          {
            "type": "integer"
          },
          {
            "type": "null"
          }
        ],
        "default": null,
        "description": "Top edge row, 0-based and window-relative."
      },
      "pane_tty": {
        "anyOf": [
          {
            "type": "string"
          },
          {
            "type": "null"
          }
        ],
        "default": null,
        "description": "TTY device path of the pane (e.g. '/dev/pts/5')."
      },
      "pane_width": {
        "anyOf": [
          {
            "type": "string"
          },
          {
            "type": "null"
          }
        ],
        "default": null,
        "description": "Width in columns"
      },
      "session_id": {
        "anyOf": [
          {
            "type": "string"
          },
          {
            "type": "null"
          }
        ],
        "default": null,
        "description": "Parent session ID"
      },
      "window_id": {
        "anyOf": [
          {
            "type": "string"
          },
          {
            "type": "null"
          }
        ],
        "default": null,
        "description": "Parent window ID"
      }
    },
    "required": [
      "pane_id"
    ],
    "type": "object"
  },
  "annotations": {
    "destructiveHint": true,
    "idempotentHint": false,
    "openWorldHint": true,
    "readOnlyHint": false
  },
  "meta": {
    "fastmcp": {
      "tags": [
        "execute"
      ]
    }
  }
}