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Being retired. Use Start instead. Portal is no longer offered when you add a step, so you can’t add it to new workflows. The Start step now declares input arguments itself and is the callable entry point. Existing Portal steps keep working.
The Portal trigger lets you turn a workflow into a reusable, callable entry point. Declare input arguments up front and other workflows — or AI agents using your workflow as a tool — can invoke it like a function.
Portal node configuration form

Portal configuration — declare the input arguments callers must pass.

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When to use

  • Reusable workflows — Wrap a multi-step process behind a clean input contract, then call it from many places.
  • Agent tools — Expose a workflow as a tool an actor in a Chat & Voice Agent can invoke.
  • Composition — Build small focused workflows and assemble them with Execute Workflow.

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How it works

When a Portal trigger runs:
  1. The caller provides values for each declared input.
  2. The Portal node hands those values to the workflow as variables.
  3. The workflow runs to completion and returns its result to the caller.
This is the workflow equivalent of declaring a function signature — explicit inputs, predictable behavior, callable from anywhere.

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Next steps

Execute Workflow

Invoke a Portal-fronted workflow from another workflow.

Capabilities

Wire a workflow as a custom tool for an actor.