ToolCallCardexperimental

The consumer owns the tool-call part and mutates its state and output as the real call resolves. While busy the header shows a spinner and a neutral status; on completion it flips to a success badge and reveals the output. The card stays collapsed the whole time — a successful call is not worth a click.

{
  "city": "Berlin",
  "unit": "celsius"
}

A call in the error state starts expanded so the failure is visible without a click, and shows errorMessage above the input. A manual toggle afterwards always wins — auto-open never fights the reader.

{
  "sql": "SELECT * FROM invoices WHERE due < now()"
}

Pass a children snippet to replace the default JSON input/output with a view built for the tool. The snippet receives the same part; the status header (badge + monospaced tool name) and the collapse mechanics stay. Here a web_search result set renders as a ranked list instead of raw JSON.