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Runs a subgraph once for every item in a list. Connect the body you want to repeat to the Loop Body output port. Inside the loop, the current item is available in the configured item assign — read it with an Assign Read node (or let Attribute nodes pick it up as the subject, if it’s a defdata struct). Assigns are shared across iterations: whatever iteration N writes, iteration N+1 sees. Handy for accumulating counters or per-item side effects.

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Configuration

  • Source list assign — assigns key holding the list to iterate.
  • Current item assign — the loop body reads the item from here.

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Control flow

  • Halt branch inside an iteration (e.g. from a Flow Guard) stops that iteration but the loop continues with the next item.
  • Halt flow (from a Flow Guard set to halt flow, or any unrecoverable error) stops the whole run immediately.

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Tips

  • Pair with Flow Filter first to narrow the list down — iterating a filtered list is usually cheaper and clearer than guarding inside the loop body.

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Ports