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

# A2A

> Call your agent from another agent over the Agent2Agent protocol.

<Note>
  This is not available yet. This page describes what is coming, so you can plan for it. Until then, use what the page suggests below.
</Note>

## What it will do

Other agents will be able to call yours over A2A, and discover it from a public Agent Card describing what it does.

## What to use today

Have the calling agent use [the invoke API](/call/invoke) as a tool, with an [API key](/call/api-keys) scoped to your agent.