# langchain==1.4.2

Category: agent-infrastructure
Published: 2026-09-18T17:31:25Z
Source: [LangChain releases](https://github.com/langchain-ai/langchain/releases/tag/langchain%3D%3D1.4.2)
Agent usefulness: 82/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-09-19T00:17:30.636Z
Tags: langchain, tools, orchestration

## Human Summary
LangChain releases published langchain==1.4.2. Changes since langchain==1.4.1 release(langchain): 1.4.2 ( 40621) fix(langchain): preserve model-generated tool calls in HITL tool call edits and add notice to ToolMessage ( 40463)

## Agent Summary
Treat langchain==1.4.2 as an official release signal. Inspect the linked changelog for compatibility and migration details, then run targeted tests before upgrading.

## Body
LangChain releases published langchain==1.4.2. This release-watch entry was generated from the project's official GitHub release feed and is kept separate from human-reviewed editorial analysis. Release notes: Changes since langchain==1.4.1 release(langchain): 1.4.2 ( 40621) fix(langchain): preserve model-generated tool calls in HITL tool call edits and add notice to ToolMessage ( 40463)

## Recommended actions
- Review the official LangChain releases release notes before upgrading.
- Check compatibility, migration, and security notes against your current agent stack.
- Run focused regression tests before production rollout.

## Sponsors
No sponsor placement attached.

## Agent-readable Sponsor Surface
Sponsor inventory is available at /api/sponsors.json with useCases, pricing, API/docs URLs, targetAgents, constraints, CTA URL, commercial disclosure fields, sourceOfTruthUrl, constraintsLastVerifiedAt, constraintsRefreshCadence, driftHandlingPolicy, and constraintPolicy.