What does Line CLI's JSON output look like?

line -p "list the TODOs" --output-format json

prints one object at the end:

{
  "type": "result", "subtype": "success", "is_error": false,
  "result": "…", "error": null, "session_id": "…",
  "num_steps": 4, "duration_ms": 18234,
  "usage": { "input_tokens": 0, "output_tokens": 0, "cached_tokens": 0, "cache_hit": 0.0 },
  "total_cost_usd": 0.0123, "edits": { "total": 0, "failed": 0 },
  "model": "auto", "version": "0.9.0-beta"
}

subtype is success, error_max_turns, error_max_budget, error_during_execution or interrupted. Costs are list prices.