Module channels 

Channels for state communication in graphs.

Channels are the core mechanism for state management in LangGraph. Unlike typical graph systems where nodes pass data directly, in LangGraph nodes write to channels and read from channels. This enables powerful patterns like automatic state reduction and checkpoint/resume.

Channel Types

• LastValue: Stores only the last written value
• Topic: Accumulates all written values as a sequence
• BinaryOperatorAggregate: Reduces multiple writes with a custom function
• EphemeralValue: Cleared after each superstep

Re-exports

pub use last_value::LastValue;

pub use topic::Topic;

pub use binop::BinaryOperatorAggregate;

pub use ephemeral::EphemeralValue;

Modules

binop

Binary operator aggregate channel implementation.

ephemeral

Ephemeral value channel implementation.

last_value

LastValue channel implementation.

topic

Topic channel implementation.

Traits

BaseChannel

The base trait for all channels.

Functions

binop

Helper to create a BinaryOperatorAggregate channel

last_value

Helper to create a LastValue channel

topic

Helper to create a Topic channel

Type Aliases

ChannelBox

A wrapper for type-erased channels