split_window

Rust

Split a window and start the configured process with no command payload. Start a pane’s configured process; accepts no command payload.

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Arguments

direction optional: Where the new pane goes relative to `pane`. Defaults to `below`.
pane required · string: The `%`-prefixed pane to split.
percent optional · integer | null: The new pane's share of the split, 1 to 100. Defaults to half.
start_directory optional · string | null: The new pane's working directory. Omit for the directory this MCP server started in, not `pane`'s current directory.

Schemas

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

Input schema

{
  "$defs": {
    "SplitDirectionSchema": {
      "enum": [
        "above",
        "below",
        "left",
        "right"
      ],
      "type": "string"
    }
  },
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "additionalProperties": false,
  "properties": {
    "direction": {
      "anyOf": [
        {
          "$ref": "#/$defs/SplitDirectionSchema"
        },
        {
          "type": "null"
        }
      ],
      "description": "Where the new pane goes relative to `pane`. Defaults to `below`."
    },
    "pane": {
      "description": "The `%`-prefixed pane to split.",
      "type": "string"
    },
    "percent": {
      "description": "The new pane's share of the split, 1 to 100. Defaults to half.",
      "minimum": 0,
      "type": [
        "integer",
        "null"
      ]
    },
    "start_directory": {
      "description": "The new pane's working directory. Omit for the directory this MCP\nserver started in, not `pane`'s current directory.",
      "type": [
        "string",
        "null"
      ]
    }
  },
  "required": [
    "pane"
  ],
  "type": "object"
}

Output schema

{
  "$defs": {
    "Relation": {
      "description": "How a pane relates to the process answering the request.\n\nThree values rather than a boolean, because \"not the caller's pane\" and\n\"there is no caller\" are different answers and an agent acts differently on\neach.",
      "oneOf": [
        {
          "const": "unknown",
          "description": "This process is not running inside tmux, so no pane is its own.",
          "type": "string"
        },
        {
          "const": "self",
          "description": "Confirmed: the same tmux server, and the same pane.",
          "type": "string"
        },
        {
          "const": "other",
          "description": "Some other pane, or a pane this crate cannot prove is the caller's.",
          "type": "string"
        }
      ]
    }
  },
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {
    "active": {
      "description": "Whether this is the window's active pane.",
      "type": "boolean"
    },
    "caller": {
      "$ref": "#/$defs/Relation",
      "description": "Whether this is the pane the MCP server itself runs in.\n\n`self` only on a confirmed match of both socket and pane id; `other`\nfor every pane that is not, including one this crate cannot prove\neither way; `unknown` when the server is not running inside tmux, so\nthe question has no answer."
    },
    "command": {
      "description": "The command currently running.",
      "type": [
        "string",
        "null"
      ]
    },
    "id": {
      "description": "The `%`-prefixed tmux identity.",
      "type": "string"
    },
    "path": {
      "description": "The pane's working directory.",
      "type": [
        "string",
        "null"
      ]
    },
    "window_id": {
      "description": "The window that contains the pane.",
      "type": "string"
    }
  },
  "required": [
    "id",
    "window_id",
    "active",
    "caller"
  ],
  "type": "object"
}

Tool annotations

{
  "destructiveHint": false,
  "idempotentHint": false,
  "openWorldHint": true,
  "readOnlyHint": false,
  "title": "Split Window"
}