SYSTEM_VARIABLE_NODE_ID = "sys"
ENVIRONMENT_VARIABLE_NODE_ID = "env"
CONVERSATION_VARIABLE_NODE_ID = "conversation"
RAG_PIPELINE_VARIABLE_NODE_ID = "rag"

# Selector heads a workflow graph reads without a node of that id.
ROOT_VARIABLE_NODE_IDS = frozenset(
    {SYSTEM_VARIABLE_NODE_ID, ENVIRONMENT_VARIABLE_NODE_ID, CONVERSATION_VARIABLE_NODE_ID}
)