> ## Documentation Index
> Fetch the complete documentation index at: https://docs.triform.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Properties → Input & Output

> Define ports, types, defaults, and parallelism

## Controls

* Parallel (toggle) — when ON, the component expects a list of inputs and executes each in parallel.
* Inputs/Outputs — add or remove ports (unless they’re fixed).
* Typing — annotate the expected type for each I/O.
* Defaults — set default input values used at execution time.

## Usage examples

* Add input `text: string` with default `"hello"`.
* Add output `summary: string`.
* Toggle Parallel ON to process an array of `text` items concurrently.

> tip: Keep contracts stable — Changing I/O shapes breaks downstream edges. Stabilize names and types early to reduce refactors.