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LangChain SDK composition patterns v1.0.0

Use this resource to compose reliable LangChain chains with LCEL

New

  • 479 downloads
  • 245 likes
  • 237 saves

Free

Install with the CLI

In a terminal, from the folder you want:

npx --yes palatekit@latest install langchain-runnable-patterns

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 writes typed LCEL chains with RunnableSequence and RunnableParallel, adds fallbacks with with_fallbacks() limited to transient errors, and tunes throughput with batch() or abatch(). You get a production-ready chain in which user input is protected from template braces.

Mostly picked by

Updated November 2, 2026

Card for the “LangChain SDK composition patterns” skill

Details

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

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What you get

  • SKILL.md: sequential and parallel composition, fallbacks and batch tuning
  • references/: batch concurrency tuning, fallback exception list, prompt escaping and composition matrix

Good fit for

  • Your LCEL chain is slow on a large batch of inputs
  • You want fallbacks that do not hide real errors

Not for

    Tags

    • langchain
    • lcel
    • runnable
    • batching
    • fallback

    About

    You say

    “Refactor my LCEL chain to process a thousand inputs in parallel, with a backup model.”

    Card for the “LangChain SDK composition patterns” 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 compose reliable LangChain chains with LCEL
    3. Review and adjust the result

    Content preview

    Files

    • LICENSE1.1 KB
    • NOTICE-PALATEKIT.md0.5 KB
    • references/batch-concurrency-tuning.md4.8 KB
    • references/fallback-exception-list.md5.6 KB
    • references/one-pager.md2.4 KB
    • references/prompt-template-escaping.md4.3 KB
    • references/runnable-composition-matrix.md4.2 KB
    • SKILL.md13.6 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-sdk-patterns
    Licence
    MIT

    Notice

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

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