langchain-sdk-patterns
Compose LangChain 1.0 Python runnables with the production defaults the docs do not warn about: parallel batching, narrow fallbacks, and brace-safe prompts. Use when building an LCEL chain with RunnableSequence / RunnableParallel, adding resilience via `.with_fallbacks()`, tuning throughput with `.batch()` or `.abatch()`, or wrapping user input in a prompt template. Trigger with "langchain runnable", "with_fallbacks", "langchain batch", "runnable sequence", "lcel", "runnableparallel", "chain composition". '
npx skills add jeremylongshore/claude-code-plugins-plus-skills --skill langchain-sdk-patterns --agent claude-code
Same command for any agent — swap --agent for codex, cursor, copilot.
Weekly change comes from our own snapshots, not the repository page — it measures attention, not adoption.
# LangChain SDK Patterns (Python) ## Overview `chain.batch(inputs)` in LangChain 1.0 does **not** parallelize by default. The `max_concurrency` parameter defaults to **1** in several provider packages (notably older `langchain-openai`), so a call like `chain.batch(inputs_1000)` runs 1,000 sequential round-trips — same wall-clock time as a `for` loop, plus the overhead of the batch machinery. Users
What does the langchain-sdk-patterns skill do?
Compose LangChain 1.0 Python runnables with the production defaults the docs do not warn about: parallel batching, narrow fallbacks, and brace-safe prompts. Use when building an LCEL chain with RunnableSequence / RunnableParallel, adding resilience via `.with_fallbacks()`, tuning throughput with `.batch()` or `.abatch()`, or wrapping user input in a prompt template. Trigger with "langchain runnable", "with_fallbacks", "langchain batch", "runnable sequence", "lcel", "runnableparallel", "chain composition". '
How do I install it?
Run `npx skills add jeremylongshore/claude-code-plugins-plus-skills --skill langchain-sdk-patterns --agent claude-code` — it drops the skill into your project so the agent can pick it up. Swap the --agent value for codex, cursor or copilot if you use one of those.
Where does this skill come from?
From jeremylongshore/claude-code-plugins-plus-skills, a repository with 2,596 stars. We read it straight from the repository tree rather than a submitted listing, so what you see here is what is actually published.
Is a popular skill a good skill?
Not necessarily. Stars measure attention, not adoption — a repository can trend for a week and be abandoned. That is why we show the weekly change from our own snapshots next to the total, instead of a single flattering number.