Accumulation Tail¶
Returns the tail of an accumulation by removing its first element. If the accumulation has zero or one element, it returns an empty accumulation. The node is defensive: on invalid inputs or errors, it yields an empty accumulation.
Usage¶
Use this node when processing a sequence stored in an accumulation and you need everything except the first element (e.g., iterative processing, recursion, or stepping through a queue-like structure). Typically paired with Accumulation Head/Accumulate/To List nodes for list-style workflows.
Inputs¶
| Field | Required | Type | Description | Example |
|---|---|---|---|---|
| accumulation | True | ACCUMULATION | An accumulation object containing a list under the key 'accum'. | {'accum': [10, 20, 30]} |
Outputs¶
| Field | Type | Description | Example |
|---|---|---|---|
| tail | WILDCARD | The tail of the input accumulation (an accumulation object with all elements except the first). If the input has <= 1 elements or is invalid, returns an empty accumulation. | {'accum': [20, 30]} |
Important Notes¶
- If the input accumulation is empty or has a single element, the output is an empty accumulation: {"accum": []}.
- If the input is not a valid accumulation object, the node returns an empty accumulation.
- Downstream nodes should expect an accumulation-like object on the output, even though the declared output type is WILDCARD.
Troubleshooting¶
- Output is empty unexpectedly: Ensure the input is a proper accumulation object shaped like {"accum": [...]}, and that it contains at least two elements.
- Downstream type mismatch: Some nodes may expect an ACCUMULATION type explicitly; insert a conversion or ensure the receiving node can accept the output as an accumulation.
- Errors in logs and empty output: Validate that the input is not None and follows the expected structure {"accum": list}.