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

# Command Line Interface

> Overview of the Aion Python SDK command-line interface.

The Aion Python SDK installs the `aion` command. Use it to run local Aion projects, start the proxy
and agent servers defined in `aion.yaml`, and chat with A2A-compatible agents during development.

## Commands

| Command                                        | Purpose                                         |
| ---------------------------------------------- | ----------------------------------------------- |
| [`aion serve`](/sdk/python/running/aion-serve) | Start local agent servers and the proxy server. |
| [`aion chat`](/sdk/python/running/aion-chat)   | Open terminal chat against an A2A endpoint.     |
| `aion --help`                                  | Show CLI help.                                  |
| `aion --version`                               | Print the Python SDK CLI version.               |

## Related Tools

The standalone [Aion Chat](/tools/aion-chat) npm package provides the same terminal chat interface
without requiring the Python SDK.