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langgraph

v1.2.0 Feature

This release adds 3 notable features for engineering teams evaluating rollout.

Published 22d AI Agents & Assistants
✓ No known CVEs patched
Read the diff → Tool health → What is this tool? →

✓ No known CVEs patched in this version

Topics

agents ai ai-agents chatgpt deepagents enterprise
+9 more
gemini generative-ai langchain langgraph llm multiagent openai pydantic python

ReleasePort's take

Moderate signal
editorial:auto 13d

LangGraph 1.2.0 adds durable error-handler resume, set_node_defaults() API, and SQLite-based streaming for checkpoint history. Delta-history APIs marked as beta signal checkpoint subsystem maturation.

Why it matters: Durable error handlers enable reliable workflow resumption after failures. SQLite streaming optimizes checkpoint retrieval. Test set_node_defaults() API and beta delta-history changes in dev before production adoption.

Summary

AI summary

Added durable error-handler resume, set_node_defaults(), and SQLite-based streaming walk for delta‑channel history.

Changes in this release

Feature Medium

Added set_node_defaults() to StateGraph in langgraph.

Added set_node_defaults() to StateGraph in langgraph.

Source: llm_adapter@2026-05-21

Confidence: high

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Feature Medium

Force delta channel snapshot after max supersteps since last snapshot in checkpoint.

Force delta channel snapshot after max supersteps since last snapshot in checkpoint.

Source: llm_adapter@2026-05-21

Confidence: high

 —
Feature Medium

Override get_delta_channel_history with streaming walk in checkpoint-sqlite.

Override get_delta_channel_history with streaming walk in checkpoint-sqlite.

Source: llm_adapter@2026-05-21

Confidence: high

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Dependency Medium

Bumped urllib3 from 2.6.3 to 2.7.0 in /libs/langgraph.

Bumped urllib3 from 2.6.3 to 2.7.0 in /libs/langgraph.

Source: llm_adapter@2026-05-21

Confidence: high

 —
Dependency Medium

Bumped mistune from 3.2.0 to 3.2.1 in /libs/langgraph.

Bumped mistune from 3.2.0 to 3.2.1 in /libs/langgraph.

Source: llm_adapter@2026-05-21

Confidence: high

 —
Dependency Medium

Bumped ty from 0.0.23 to 0.0.33 in /libs/sdk-py.

Bumped ty from 0.0.23 to 0.0.33 in /libs/sdk-py.

Source: llm_adapter@2026-05-21

Confidence: high

 —
Dependency Medium

Bumped jupyter-server from 2.17.0 to 2.18.0 in /libs/langgraph.

Bumped jupyter-server from 2.17.0 to 2.18.0 in /libs/langgraph.

Source: llm_adapter@2026-05-21

Confidence: high

 —
Deprecation Medium

Marked DeltaChannel and delta-history APIs as beta in docs/checkpoint.

Marked DeltaChannel and delta-history APIs as beta in docs/checkpoint.

Source: llm_adapter@2026-05-21

Confidence: low

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Bugfix Medium

De-flaked heartbeat progress test in langgraph.

De-flaked heartbeat progress test in langgraph.

Source: llm_adapter@2026-05-21

Confidence: low

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Refactor Medium

Re-implemented exit mode for delta channel in langgraph.

Re-implemented exit mode for delta channel in langgraph.

Source: llm_adapter@2026-05-21

Confidence: low

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Full changelog

Changes since 1.2.0a7

  • release: bump alpha packages to official versions (#7775)
  • feat(langgraph): durable error-handler resume across host crashes (#7773)
  • feat(langgraph): add set_node_defaults() to StateGraph (#7747)
  • chore(deps): bump urllib3 from 2.6.3 to 2.7.0 in /libs/langgraph (#7766)
  • chore(deps): bump mistune from 3.2.0 to 3.2.1 in /libs/langgraph (#7733)
  • chore(langgraph): bump langchain-core to 1.4.0 (#7767)
  • feat(checkpoint): force delta channel snapshot after max supersteps since last snapshot (#7746)
  • test(langgraph): de-flake heartbeat progress test (#7735)
  • chore(langgraph): re-implement exit mode for delta channel (#7730)
  • chore(deps): bump ty from 0.0.23 to 0.0.33 in /libs/sdk-py (#7666)
  • docs(checkpoint): mark DeltaChannel and delta-history APIs as beta (#7732)
  • chore(deps): bump jupyter-server from 2.17.0 to 2.18.0 in /libs/langgraph (#7713)
  • feat(checkpoint-sqlite): override get_delta_channel_history with streaming walk (#7702)
  • chore: "chore: minor clean up around checkpoint and delta channel" (#7706)
  • chore: minor clean up around checkpoint and delta channel (#7705)
View diff on GitHub

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Build resilient language agents as graphs.

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