AddValueNode

A utility node for injecting data or copying values within the state. It is useful for setting flags, default values, or aliasing keys.

Import

from lar.node import AddValueNode

Constructor

AddValueNode(
    key: str, 
    value: Any, 
    next_node: BaseNode = None
)

Parameter	Type	Description
`key`	`str`	The key in the state dictionary to set/overwrite.
`value`	`Any`	The value to assign. Supports dynamic state references using `{key_name}` syntax.
`next_node`	`BaseNode`	The next node to execute in the graph.

Usage Examples

1. Setting a Static Flag

mark_success = AddValueNode(
    key="status",
    value="SUCCESS",
    next_node=None
)

2. Copying State Variables (Aliasing)

You can copy one state key to another using {} syntax. This is useful for reshaping data before passing it to a tool.

# Copies state["llm_output"] -> state["final_answer"]
alias_node = AddValueNode(
    key="final_answer",
    value="{llm_output}",
    next_node=next_step
)