Nodes Overview

Supported Nodes

Vellum offers over a dozen Node types that you can use to build any Workflow you can imagine. Below is an overview of each Node type with links to their detailed pages.

Node	Description
Prompt Node	Invoke LLMs with your prompts, optionally using variables from other nodes
Templating Node	Apply Jinja templating to perform lightweight data transformations
Search Node	Search against a Document Index, great for RAG
API Node	Make an HTTP request to an API endpoint
Code Execution Node	Run custom Python or Typescript code
Subworkflow Node	Makes Workflows reusable and more maintainable as they get more complex
Map Node	Iterate over an array, executing a sub-workflow for each item
Guardrail Node	Run an inline evaluation using a pre-defined Metric
Conditional Node	Branch your workflow based on a condition, also useful for error handling
Merge Node	Wait for one or multiple branches to complete before continuing
Final Output Node	Exposes values you can use in your application, you may have more than one!
Error Node	Stop workflow execution and raise an error
Note Node	A simple node that displays text to help annotate your Workflow

Node Adornments

In addition to the standard nodes, Vellum also supports Node Adornments that can be applied to existing nodes to add functionality like error handling and retry logic:

Adornment	Description
Retry Node Adornment	Repeatedly invokes a node until it succeeds or reaches maximum attempts
Try Node Adornment	Attempts to invoke a node and continues with an Error output if it fails