> ## Documentation Index
> Fetch the complete documentation index at: https://docs.zeroruntime.ai/llms.txt
> Use this file to discover all available pages before exploring further.
# Deployments
> How a Zero Runtime agent runs in production - the runtime handles real-time media, and you deploy your agent to Zero Runtime Cloud with a single zrt up command.
Your agent runs as a **worker** - your code, wrapped by `zrt.serve(...)`. The Zero Runtime
**runtime** handles the real-time media (transport, GPUs, STT/LLM/TTS orchestration, and
turn-taking); your worker just registers with the runtime and receives sessions. You never
operate low-latency media infrastructure.
Everything here is driven by the `zrt` CLI. Install it with pip (Python 3.11+):
```bash theme={null}
pip install zrt
```
See [CLI Setup](/deployments/cli-setup) for authentication and next steps.
## How a session flows
1. A **caller** starts a live session (from a playground, a web/mobile client, or an
inbound phone call).
2. The session reaches the **ZRT Runtime**, which Zero Runtime manages: transport, GPUs, and
real-time media.
3. The **control plane** invokes your agent to start the session.
4. The runtime streams that session to one of your **registered workers**, which runs your
agent code and responds back through the runtime.
## Deploying your agent
You deploy your agent to **Zero Runtime Cloud** with `zrt up`. Zero Runtime hosts, scales,
and runs your agent for you: it pulls your image and schedules the pods on **our** compute,
so you never operate a server. You manage everything (versions, secrets, sessions, and logs)
through the `zrt` CLI.
```bash theme={null}
zrt up
```
## Get started
Install `zrt` with pip and authenticate.
Create a project, test it locally, then deploy end to end.
Versions, secrets, sessions, and logs.
Every command and flag in one place.