Credits and usage
A tool ran but there is no output
What happens to credits and partial work when a turn fails.
If a generation fails completely (no output), Galaxy keeps the error on the assistant message and does not treat the turn as a success. Tool settlement is once per successful tool invocation. A failed Magica call should not charge a completed-tool cost.
If a generation completed but you do not like the image or crop, that successful tool is still settled. Send another message to retry or revise.