Configurable status bar items (e.g. working directory / git branch) #33676

Problem

When working with multiple OpenCode splits (Cmd+D) in the same terminal tab — each pointing at a different git worktree of the same monorepo — there is no way to tell at a glance which split is running in which worktree. The sidebar shows the directory name but disappears when the window is narrowed, and terminal-level tab titles don't help across splits in the same tab (splits have no per-pane title in most terminal emulators, including Ghostty).

The status bar below the message input (currently showing token usage / model) is the one piece of UI that is always visible regardless of window size or sidebar state, but it is currently hardcoded — there is no config field to add custom items to it.

Proposal

Add a config field (e.g. statusbar.items) to the config schema that accepts one or more shell commands whose output is rendered in the status bar alongside the existing token/model info. Example:

{
  "statusbar": {
    "items": [
      { "command": "basename \"$PWD\"", "refresh": "on-focus" },
      { "command": "git branch --show-current", "refresh": "on-focus" }
    ]
  }
}

Why this matters

For users running 3-4 OpenCode splits side-by-side (common in multi-worktree monorepo workflows), the status bar is the only UI surface guaranteed to be visible in every split regardless of window width. Letting it show the working directory and/or git branch would make it immediately obvious which split is which — without needing to widen the sidebar in each pane.

Alternatives considered

• Shell-level tab titles (OSC sequences): works for tabs, but most terminal emulators (including Ghostty) don't have per-split/pane titles — only the focused split's title propagates to the tab.
• CLAUDE.md rule forcing the agent to print the branch at the start of every reply: noisy and only visible when scrolling back through messages, not at a glance.

Environment

• OpenCode TUI (terminal)
• Ghostty terminal, macOS