Does it support LangChain Expression Language (LCEL)?

Absolutely, a primary function of this skill is refactoring deprecated LLMChains into modern LCEL pipe syntax.

How does it handle agent migrations?

It provides a guided path to move from the deprecated initialize_agent pattern to the modern create_tool_calling_agent and AgentExecutor architecture.

Will it help me identify breaking changes?

Yes, the skill reviews version-specific breaking changes and uses a checklist to ensure all architectural updates are addressed before final deployment.

Does this skill handle LangChain 0.1 to 0.3 migrations?

Yes, it includes specific strategies for the major restructuring introduced in 0.2 and 0.3, including package extraction and import changes.

Can it automatically update my Python imports?

Yes, it uses regex-based patterns to update legacy import paths to the newer langchain_core and provider-specific packages.

LangChain Upgrade & Migration

Name: LangChain Upgrade & Migration
Author: jeremylongshore

byjeremylongshore

•

983

Data Science & ML

Guides and automates the migration of LangChain applications from legacy patterns to modern standards and newer SDK versions.

About

This skill assists developers in navigating the complex breaking changes between LangChain versions (0.1, 0.2, and 0.3+). It provides automated import updates, refactors legacy LLMChains into the LangChain Expression Language (LCEL), reconfigures agents for modern tool-calling APIs, and updates memory implementations. By providing version-specific migration strategies and automated validation steps, it ensures a smooth transition to the latest LangChain ecosystem with minimal manual effort and reduced technical debt.

Key Features

Automated dependency management and package synchronization
983 GitHub stars
Automated import path migration (e.g., langchain to langchain_core)
Agent initialization updates for tool-calling patterns
Refactoring legacy LLMChains to modern LCEL syntax
Version-specific breaking change checklists and validation

Use Cases

Migrating custom agents to the modern create_tool_calling_agent pattern
Refactoring legacy chain code to the LangChain Expression Language (LCEL)
Upgrading a production LangChain application from version 0.1 to 0.3

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add jeremylongshore/claude-code-plugins-plus-skills langchain-upgrade-migration

For use in Claude.ai and ChatGPT

Download Skill

GitHub