langgraph 0.1.8

Summary of Changes

• Added support for attaching metadata to nodes in graphs, which can be visualized in graph representations (#990)
• Fixed docstring for astream method to match stream method, with complete examples for different stream modes (#994)
• Changed default stream_mode reference to use self.stream_mode instead of hardcoded value (#994)
• Updated minimum required version of langchain-core to 0.2.15

Detailed Changes

langgraph.graph.graph.NodeSpec

• Added new class to store a runnable along with optional metadata for graph nodes

langgraph.graph.graph.Graph

• Modified add_node method to accept an optional metadata parameter
• Changed internal node storage to use NodeSpec instances instead of raw runnables
• Updated all relevant methods to work with the new node structure

langgraph.graph.graph.CompiledGraph

• Updated attach_node and related methods to handle NodeSpec instances
• Modified get_graph to include node metadata in visualizations

langgraph.pregel.Pregel

• Updated docstring for stream method to reference self.stream_mode as the default
• Added comprehensive docstring for astream method with examples for all stream modes ("values", "updates", "debug")
• Fixed import example in docstring to use correct path for constants

langgraph.pregel.read.PregelNode

• Added support for metadata parameter in __init__ method
• Metadata is now propagated to the node's configuration