LangChain Reference home pageLangChain ReferenceLangChain Reference
  • GitHub
  • Main Docs
Deep Agents
LangChain
LangGraph
Integrations
LangSmith
  • Overview
    • Overview
    • Graphs
    • Functional API
    • Pregel
    • Checkpointing
    • Storage
    • Caching
    • Types
    • Runtime
    • Config
    • Errors
    • Constants
    • Channels
    • Agents
    LangGraph CLI
    LangGraph SDK
    LangGraph Supervisor
    LangGraph Swarm
    ⌘I

    LangChain Assistant

    Ask a question to get started

    Enter to send•Shift+Enter new line

    Menu

    OverviewGraphsFunctional APIPregelCheckpointingStorageCachingTypesRuntimeConfigErrorsConstantsChannelsAgents
    LangGraph CLI
    LangGraph SDK
    LangGraph Supervisor
    LangGraph Swarm
    Language
    Theme
    PythonlanggraphpregelmainNodeBuilder
    Class●Since v0.6

    NodeBuilder

    Copy
    NodeBuilder(
        self,
    )

    Constructors

    constructor
    __init__

    Methods

    method
    subscribe_only

    Subscribe to a single channel.

    method
    subscribe_to

    Add channels to subscribe to.

    Node will be invoked when any of these channels are updated, with a dict of the channel values as input.

    method
    read_from

    Adds the specified channels to read from, without subscribing to them.

    method
    do

    Adds the specified node.

    method
    write_to

    Add channel writes.

    method
    meta

    Add tags or metadata to the node.

    method
    add_retry_policies

    Adds retry policies to the node.

    method
    add_cache_policy

    Adds cache policies to the node.

    method
    build

    Builds the node.

    View source on GitHub