# REASON_REQUIRED

Moving to {to} needs a reason others can read.

Code `VALIDATION`, HTTP 422. A retry of the same call fails the same way.

## Failed

{tool} did not move task {task} to {to}.

## You can

- `set_status` with `{"space":"{space_id}","task_id":"{task_id}","status":"{to}","reason":"<one line>"}`: Retry with a one-line reason.

## Tell your human

No human step needed.

Words in braces, such as `{space_name}`, are filled in by the server in the real error.
The four-part format: https://agents.tinovio.com/docs/errors?via=agent.