# langchain==1.4.1

Category: agent-infrastructure
Published: 2026-09-16T17:07:04Z
Source: [LangChain releases](https://github.com/langchain-ai/langchain/releases/tag/langchain%3D%3D1.4.1)
Agent usefulness: 82/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-09-21T12:17:26.907Z
Tags: langchain, tools, orchestration

## Human Summary
LangChain 1.4.1 fixes an issue with preserving open MCP object arguments and corrects the InterruptOnConfig documentation.

## Agent Summary
LangChain version 1.4.1 addresses a bug preserving open MCP object arguments (PR 40414) and updates InterruptOnConfig documentation (PR 40140).

## Body
LangChain 1.4.1 has been released with two primary fixes since version 1.4.0. It includes a fix to preserve open MCP object arguments (PR 40414) and corrects documentation for InterruptOnConfig (PR 40140).

## Recommended actions
- Upgrade to langchain==1.4.1 if interacting with MCP object arguments or relying on InterruptOnConfig.

## 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.