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Yes — that’s correct. - In Prefect 3.x, an ECS worker does not execute your flow code itself. It polls for scheduled runs, then submits them to AWS by starting an ECS task (Fargate or EC2) and monitors that task’s status. Your code runs inside the ECS task container. - Docker worker: the worker launches a Docker container on the same machine where the worker is running (using the local Docker daemon). The compute is the worker host. - Process worker: the worker executes the flow directly as a subprocess on the same machine. More details: - ECS worker behavior and config: Prefect ECS guide - Overview of work pools and workers: Prefect blog: Work pools and workers

Short answer: yes. With an ECS work pool, the worker’s job is to submit and monitor your flow run as an ECS task; the user code actually runs inside the ECS task’s container(s), not inside the worker process. Quick comparison: - ECS work pool: the worker polls for flow runs, creates/starts an ECS task (Fargate or EC2), then monitors it. Your flow executes inside that ECS task. - Docker work pool: the worker polls for flow runs and starts a Docker container on the host where the worker is running. Your flow executes inside that container. - Process work pool: the worker polls for flow runs and spawns a local subprocess on the same machine. Your flow executes in that subprocess. Relevant docs: - ECS work pool guide - Work pools and workers overview