n8n 2.43.0: resume agents after waiting workflows, with Sume runs

n8n 2.43.0, listed as a pre-release dated October 6, 2026, includes "Resume Preview agents after waiting workflows finish". If your agent waits on a Sume run that takes minutes, give the Sume request a communication.webhook_url pointing at an n8n webhook and let the run call you back. You get one signed POST per run, so there is no polling loop to keep alive.

What I can and cannot say about n8n

The release notes give one line about this feature. I did not read node-level docs for it, so I am not describing how the resume is configured. Everything below is about the Sume side of the wait.

What Sume sends

A Format run, a scheduled run and an Agent Completion each deliver one terminal event after a run completes or fails: format.run.terminal, action.run.terminal or agent.run.terminal. A run is one agent turn, so the event fires once even when the turn made many clips. The URL must be public HTTPS, and Sume does not follow redirects, so register the final URL.

Handler rules for the n8n side

Use the envelope request_id (equal to run_id) as the dedupe key, since it is stable across retries. Branch on outcome, which is ok, degraded or error, not just on status. A canceled run sends no webhook at all, so if your workflow can cancel, poll status_url afterwards instead of waiting.

Keep a poll as a backup. status_url and result_url stay valid whether or not you use the webhook.