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Examples

1) Basic Runnable Chain​

const chain = prompt
  .pipe(model)
  .pipe(parser);

Use when you need linear prompt -> model -> parse flow.

2) Input Enrichment with RunnableMap​

const inputMap = new RunnableMap({
  topic: new RunnableLambda(({ topic }) => topic.trim()),
  tone: new RunnableLambda(() => "concise")
});

Use when prompt needs multiple derived fields.

3) Parallel Branches​

const parallel = new RunnableParallel({
  length: new RunnableLambda((text: string) => text.length),
  upper: new RunnableLambda((text: string) => text.toUpperCase())
});

Use for independent transformations that can run concurrently.

4) Tool-Based Agent​

Use Agent + tool(...) when model must call external capabilities.

Prefer chain-only architecture until tool reasoning is needed.