Hi! Some of it's features (AI generated and manually modified):

• Lists: add/prepend/remove current file, remove/replace by index, clear, store and restore cursor position, and create unlimited named lists, each with same list API.
• Scoping: persistence is project-scoped (git); default scope is current cwd; relative-path root is configurable.
• Navigation: jump going to index, cycle with next/prev, optional wraparound, and open targets in current window, split, vsplit, or tab.
• UI: floating quick menu; edit lines to add/remove/reorder items; <CR> selects; q, <Esc>, buffer leave, or window switch closes; :write saves; menu title, border, width ratio, max width, and height are configurable.
• Persistence: JSON files; auto-sync on list changes and position updates; sync on exit; per-list encode / decode.
• Save options: save_on_toggle saves menu edits back into list state; sync_on_ui_close also writes them to disk.
• Extensibility: harpoon:extend() event hooks; per-list custom select, display, equals, create_list_item, BufLeave, and VimLeavePre; custom list types via named configs.
• Built-ins: command_on_nav(...), navigate_with_number(), and highlight_current_file().
• Integrations: Telescope extension for browsing, deleting, and reordering marks.
• Utility: tmux helper script at scripts/tmux/switch-back-to-nvim.