Does a Format run webhook fire per clip? No, once per turn

No. A Format run is one agent turn, so its terminal event fires exactly once, however many clips, images or files the turn made. Sume has no per-artifact run event and does not plan one (Run webhooks). Read the finished clips from artifacts[] on the receipt after the single event arrives.

What fires and when

The event of the first run already fired and does not fire again when you continue.

If you need progress inside a turn

Use the generation-job layer (Webhooks). It fires one event per job when the job completes. Job events name a job, not a step of your recipe, so map a job to a scene on your side.

Handler checklist

• Route on the event name, and do not parse the body to find the run type.
• Make the handler idempotent on the run id. A redelivery can reach you twice.
• On a continued run, expect a different run id and the same thread_id.
• Poll GET /v1/format-runs/{run_id} if the event never arrives.