# libtmux.neo.FIELD_VERSION

- **Module:** libtmux.neo
- **Package:** libtmux
- **Language:** Python
- **Kind:** constant
- **Source:** https://github.com/tmux-python/libtmux/blob/38e368c11117fb4aeb2f082d552cd4f210eae06a/src/libtmux/neo.py#L51
- **Page:** https://libtmux.org/en/py/stable/reference/libtmux-neo-field_version/

```py
libtmux.neo.FIELD_VERSION: dict[str, str] = {
    # Post-3.2a additions (verified against tmux's format.c at each gated
    # release tag, e.g. https://github.com/tmux/tmux/blob/3.6a/format.c).
    "pane_dead_signal": "3.3",
    "pane_dead_time": "3.3",
    # tmux 3.7 additions (verified against format.c / tmux.1 at the 3.7 tag).
    "bracket_paste_flag": "3.7",
    "pane_flags": "3.7",
    "pane_floating_flag": "3.7",
    "pane_pb_progress": "3.7",
    "pane_pb_state": "3.7",
    "pane_pipe_pid": "3.7",
    "pane_x": "3.7",
    "pane_y": "3.7",
    "pane_z": "3.7",
    "pane_zoomed_flag": "3.7",
    "synchronized_output_flag": "3.7",
}
```

Minimum tmux version that registers each format token.

Field names absent from this dict default to ``"3.2a"`` (always-safe within
the supported tmux range). Entries here represent tokens added after 3.2a
that need explicit gating to keep the ``-F`` template compatible with older
tmux versions.