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langgraph

v1.2.1 Feature

This release adds 1 notable feature for engineering teams evaluating rollout.

Published 13d 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

Light signal
editorial:auto 13d

langgraph 1.2.1 fixes v3 message handling to exclude tool results and adds an opt-in `before_builtins` stream transformer option. Dependencies on idna and langsmith are updated to current versions.

Why it matters: If your deployment processes v3 messages, test this fix in dev before rolling out. Dependency updates are routine; merge as part of normal cadence.

Summary

AI summary

Fix keeps tool results out of v3 messages.

Changes in this release

Feature Medium

Adds `before_builtins` opt-in for stream transformers in langgraph.

Adds `before_builtins` opt-in for stream transformers in langgraph.

Source: llm_adapter@2026-05-21

Confidence: high

 —
Dependency Medium

Bumps idna version from 3.11 to 3.15 in langgraph libs.

Bumps idna version from 3.11 to 3.15 in langgraph libs.

Source: llm_adapter@2026-05-21

Confidence: low

 —
Dependency Medium

Bumps langsmith from 0.7.31 to 0.8.0 in langgraph libs.

Bumps langsmith from 0.7.31 to 0.8.0 in langgraph libs.

Source: llm_adapter@2026-05-21

Confidence: low

 —
Bugfix Medium

Keeps tool results out of v3 messages in langgraph.

Keeps tool results out of v3 messages in langgraph.

Source: llm_adapter@2026-05-21

Confidence: high

 —
Full changelog

Changes since 1.2.0

  • release(langgraph): 1.2.1 (#7883)
  • feat(langgraph): add before_builtins opt-in for stream transformers (#7882)
  • chore(deps): bump idna from 3.11 to 3.15 in /libs/langgraph (#7866)
  • fix(langgraph): keep tool results out of v3 messages (#7838)
  • chore(deps): bump langsmith from 0.7.31 to 0.8.0 in /libs/langgraph (#7788)
View diff on GitHub

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About langgraph

Build resilient language agents as graphs.

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