LangGraph

Fixed a delta channel bug where updateState on a fresh thread would force a snapshot instead of a stub checkpoint.

Fixes an Overwrite node's serialization during JSON roundtrips and ensures exit-mode task IDs are valid UUIDs instead of raw strings. Also patches a superstep consistency issue where DeltaChannel writes could be overwritten incorrectly.

Fixed a regression from 1.2.3 where nested subgraphs failed to inherit the parent checkpoint_ns, and a v3 stream abort that was not canceling running subgraphs.

The CLI now supports compatible API version ranges for more flexible versioning.

Fixed an updateState bug related to deltaChannel on an empty thread. This release also includes dependency updates and internal migrations.

The LangGraph CLI now supports passing certfile and cert key when running the dev server under HTTPS. This release includes changes since cli==0.4.28.

Changes since cli==0.4.27

Fixed _on_started to remain backward-compatible with overrides predating the cause parameter.

Fixed an issue where BaseMessages with id=None were assigned unstable IDs before DeltaChannel checkpoint writes, now assigning stable IDs instead.

Added before_builtins opt-in for stream transformers. Fixed tool results being included in v3 messages.

Error handlers now resume durably across host crashes, and a new set_node_defaults() method is available on StateGraph for setting default values and node-level retries. Delta channel checkpointing is forced after a configurable number of supersteps, and the DeltaChannel and delta-history APIs are marked as beta.