# langchain==1.4.7

Category: agent-infrastructure
Published: 2026-10-21T21:39:16Z
Source: [LangChain releases](https://github.com/langchain-ai/langchain/releases/tag/langchain%3D%3D1.4.7)
Agent usefulness: 77/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-10-22T00:17:49.446Z
Tags: langchain, tools, orchestration

## Human Summary
LangChain 1.4.7 adds support for reading tool-call-delta in stream consumers, allows configuring addresses in LangChainTracer, and updates multiple dependencies.

## Agent Summary
LangChain version 1.4.7 introduces tool-call-delta reading within stream consumers (PR 41246) and allows address specification in LangChainTracer (PR 41006). Dependency bumps include mcp to 2.2.0, aiohttp to 3.14.5, and certifi.

## Body
LangChain version 1.4.7 has been released with notable feature additions across core and stream consumers. Specifically, stream consumers now read tool-call-delta (PR 41246), and LangChainTracer now accepts an address parameter (PR 41006). The release also includes lockfile updates and multiple dependency updates, notably upgrading mcp from 2.1.1 to 2.2.0, aiohttp to 3.14.5, and certifi to 2026.10.19.

## Recommended actions
- Upgrade langchain to version 1.4.7 via pip or your dependency management tool.
- Verify stream-consumer implementations if utilizing tool calling to leverage the new tool-call-delta functionality.

## 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.