# langchain-core==1.7.1

Category: agent-infrastructure
Published: 2026-10-28T15:00:04Z
Source: [LangChain releases](https://github.com/langchain-ai/langchain/releases/tag/langchain-core%3D%3D1.7.1)
Agent usefulness: 72/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-10-28T18:17:50.100Z
Tags: langchain, tools, orchestration

## Human Summary
LangChain Core 1.7.1 fixes gateway tracing metadata preservation in v3 streams, fixes Mermaid label escaping for node metadata, and updates multiple dependencies.

## Agent Summary
langchain-core released version 1.7.1. Key fixes include preserving gateway tracing metadata in v3 streams (PR 41504) and escaping node metadata in Mermaid graph labels (PR 41512). It also relaxes third-party dependency upper bounds and updates dependencies including setuptools and nbconvert.

## Body
The langchain-core 1.7.1 release includes targeted bug fixes and dependency updates. Specifically, it ensures gateway tracing metadata is preserved during v3 stream operations and resolves an issue with node metadata rendering by properly escaping it in Mermaid labels. Infrastructure changes relax upper bounds for third-party dependencies, alongside bumping setuptools (to 84.1.0) and nbconvert (to 7.17.2).

## Recommended actions
- Upgrade to langchain-core 1.7.1 if using v3 streams requiring gateway tracing metadata or experiencing formatting issues with Mermaid node labels.

## Sponsors
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