# libtmux_mcp.models.SessionInfo.active_pane_id

- **Module:** libtmux_mcp.models
- **Package:** libtmux-mcp
- **Language:** Python
- **Kind:** attribute
- **Source:** https://github.com/tmux-python/libtmux-mcp/blob/4daddc0dfca96c43bf521d818bf91564e1434760/src/libtmux_mcp/models.py#L20
- **Page:** https://libtmux.org/en/py/stable/mcp/reference/libtmux_mcp-models-sessioninfo-active_pane_id/

```py
libtmux_mcp.models.SessionInfo.active_pane_id: str | None = Field(
        default=None,
        description=(
            "Pane id (``%N``) of the session's active pane. Guaranteed "
            "non-None on ``create_session`` return (libtmux creates the "
            "session with one initial pane). May be None from "
            "``list_sessions`` rows for sessions in transient teardown "
            "states where ``active_pane`` is unavailable."
        ),
    )
```