langgraph

v1.2.3 Feature

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

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Topics

agents ai ai-agents chatgpt deepagents enterprise

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gemini generative-ai langchain langgraph llm multiagent openai pydantic python

Summary

AI summary

Updates langgraph, sdk-py, and cli across a mixed release.

Changes in this release

Type	Severity	Summary	CVE
Feature
Feature	Low	Adds websocket stream transports to sdk-py Adds websocket stream transports to sdk-py Source: llm_adapter@2026-06-01 Confidence: high	—
Feature	Low	Adds messages and tool call projections to sdk-py Adds messages and tool call projections to sdk-py Source: llm_adapter@2026-06-01 Confidence: high	—
Feature	Low	Adds v3 streaming primitives and SSE transport to sdk-py Adds v3 streaming primitives and SSE transport to sdk-py Source: llm_adapter@2026-06-01 Confidence: high	—
Feature	Low	Wires RemoteGraph.interleave to sdk-py interleave_projections Wires RemoteGraph.interleave to sdk-py interleave_projections Source: llm_adapter@2026-06-01 Confidence: high	—
Feature	Low	Adds v3 streaming support to RemoteGraph Adds v3 streaming support to RemoteGraph Source: llm_adapter@2026-06-01 Confidence: high	—
Feature	Low	Names tool‑dispatched subagents via lc_agent_name Names tool‑dispatched subagents via lc_agent_name Source: llm_adapter@2026-06-01 Confidence: high	—
Dependency	Low	Bumps api bound to 0.10.0 in cli Bumps api bound to 0.10.0 in cli Source: llm_adapter@2026-06-01 Confidence: high	—
Bugfix
Bugfix	Medium	Fixes renaming of ProtocolEvent.eventId to event_id for wire consistency Fixes renaming of ProtocolEvent.eventId to event_id for wire consistency Source: llm_adapter@2026-06-01 Confidence: high	—
Bugfix	Medium	Fixes merge‑instead‑of‑overwrite behavior in ensure_config for callbacks, tags, metadata, configurable Fixes merge‑instead‑of‑overwrite behavior in ensure_config for callbacks, tags, metadata, configurable Source: llm_adapter@2026-06-01 Confidence: high	—
Bugfix	Medium	Distinguishes user‑canceled from other cancellations (LSD-1507) Distinguishes user‑canceled from other cancellations (LSD-1507) Source: llm_adapter@2026-06-01 Confidence: high	—

Full changelog

Changes since 1.2.2

release(langgraph): 1.2.3 (#7945)
feat(langgraph): wire RemoteGraph.interleave to sdk-py interleave_projections (#7938)
feat(langgraph): add v3 streaming support to RemoteGraph (#7927)
feat(langgraph): name tool-dispatched subagents via lc_agent_name (#7928)
fix(langgraph): rename ProtocolEvent.eventId to event_id to match the wire field (#7942)
fix(langgraph): merge instead of overwrite in ensure_config for callbacks, tags, metadata, configurable (#7926)
fix(langgraph): [LSD-1507] Distinguish between user cancelled and other cancellations (#7920)
fix(cli): bump api bound to 0.10.0 (#7922)
feat(sdk-py): add websocket stream transports (#7830)
feat(sdk-py): add messages and tool call projections (#7823)
feat(sdk-py): add v3 streaming primitives and SSE transport (#7818)