Feature: Custom statusLine via shell script (like Claude Code) #30295

Description

Claude Code supports a customizable statusLine that pipes session state as JSON to a shell script after each assistant message. The script's stdout becomes the status bar. OpenCode currently renders the status bar in SolidJS with no user-facing customization.

Proposal

Add a statusLine config option to opencode.json (or tui.json) that accepts a shell command. After each assistant message, OpenCode pipes session state as JSON to stdin. Whatever the script prints to stdout replaces or extends the current status bar.

Example config

{
  "statusLine": {
    "type": "command",
    "command": "~/.config/opencode/statusline.sh"
  }
}

Example JSON payload (piped to stdin)

{
  "model": { "display_name": "Claude Sonnet 4.5" },
  "session": { "id": "...", "cost_usd": 1.58 },
  "context_window": { "used_percentage": 10, "context_window_size": 200000 },
  "tokens": { "input": 50000, "output": 47100 },
  "workspace": { "current_dir": "/path/to/project", "branch": "feature/auth" }
}

Example output

feature/auth │ ██████░░░░ 10% │ $1.58

Why

• Users want to display git branch, token usage, cost, and custom indicators
• A shell script is the simplest possible extension point — no plugin SDK needed
• Claude Code already has this working; the JSON schema could be similar
• This would be a high-impact, low-complexity feature

Alternatives considered

• TUI plugin with SolidJS slots: too complex for most users
• Config-only approach: not flexible enough for git branch, colors, etc.

References

• Claude Code statusLine docs
• Example implementation