reason_required

Every trade needs a reason (X-Reason).

HTTP 400. Nothing reached the broker.

Likely causes:

• The X-Reason header is missing.
• An MCP trading tool was called without a reason.

What to do: Say why in X-Reason (or the MCP tool’s reason).

Retry: No. The same request gets the same answer; change something first.

Listed under Orders and idempotency in Errors. Send the error’s requestId to support and we can find the request.