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LangChain 0.3 to 1.0 migration v1.0.0

Use this resource to migrate a Python project from LangChain 0.3 to LangChain 1.0

New

  • 404 downloads
  • 124 likes
  • 185 saves

Free

Install with the CLI

In a terminal, from the folder you want:

npx --yes palatekit@latest install langchain-1-0-upgrade

With no option, the skill goes to ~/.agents/skills/; add --agent claude-code (or codex, cursor…) to target an agent.

First time: connect the CLI with

npx --yes palatekit@latest login

The agent finds removed APIs such as LLMChain, initialize_agent, ConversationBufferMemory and astream_log, applies the fixes and pins packages together. It also proposes a phased rollout to limit production risk.

Mostly picked by

Updated November 2, 2026

Card for the “LangChain 0.3 to 1.0 migration” skill

Details

Works in
Install guides
Generates with
Your agent's model
Licence
MIT

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What you get

  • SKILL.md: pre-flight audit, package upgrade and step-by-step fixes
  • references/breaking-changes-matrix.md: table of breaking changes
  • references/codemod-patterns.md and references/phased-rollout-playbook.md: fix patterns and rollout plan

Good fit for

  • Your deployment crashes on import after a plain pip install -U langchain
  • You are preparing a version-upgrade pull request

Not for

    Tags

    • langchain
    • migration
    • python
    • langgraph
    • upgrade

    About

    You say

    “Audit my project for the LangChain 1.0 migration and list the LLMChain and initialize_agent calls to fix.”

    Card for the “LangChain 0.3 to 1.0 migration” skill

    Skill published by Jeremy Longshore <jeremy@intentsolutions.io> under the MIT license, delivered in its original version.

    Show more

    How to use it

    1. Install the skill in your agent's skills folder
    2. Ask your agent to migrate a Python project from LangChain 0.3 to LangChain 1.0
    3. Review and adjust the result

    Content preview

    Files

    • LICENSE1.1 KB
    • NOTICE-PALATEKIT.md0.6 KB
    • references/breaking-changes-matrix.md5.8 KB
    • references/codemod-patterns.md6.5 KB
    • references/migration-detection.md4.2 KB
    • references/one-pager.md3.4 KB
    • references/phased-rollout-playbook.md5.5 KB
    • SKILL.md13.3 KB

    Origin and licence

    Listed unmodified

    Author
    Jeremy Longshore <jeremy@intentsolutions.io>
    Source
    github.com/jeremylongshore/tons-of-skills-marketplace/tree/ab85a061f7bcc039dac13ee193de7a4cd4388571/skills/.curated/langchain-upgrade-migration
    Licence
    MIT

    Notice

    « langchain-upgrade-migration » (Jeremy Longshore <jeremy@intentsolutions.io>, MIT) livré dans sa version d'origine : fiche en français et en anglais par PalateKit.

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