Workflow Execution

Understand how data moves through a workflow, how nested runs behave, and what happens when execution fails or pauses.

• Execution Order and Node Dependencies

• Inputs, Outputs, and Variable References

• Data Types, Lists, Missing Values, and Empty Results

• Branches, Conditions, and Routing

• Loops: Item Mapping, Concurrency, and Result Order

• Loop Failures and Partial Results

• StackAI Project and Beta Nodes

• Nested Workflow Inputs, Outputs, and Identity

• Nested Workflow Version and Environment Selection

• Timeouts and Execution Limits

• Retries, Fallbacks, and Error Branches

• External Side Effects and Safe Retries

• Paused Runs, Human Input, and Resumption

• Cancellation and Run Status

• Batch Execution and Per-Item Results