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

# Deployments

Deployments are instances of your agent running on Cartesia's servers.

<Frame>
  <img src="https://mintcdn.com/cartesia-2650f86a/hwxvcrAswl9LXrPR/assets/images/agents/deployments.png?fit=max&auto=format&n=hwxvcrAswl9LXrPR&q=85&s=077626e8e5c38564991d3d5c12349871" alt="Deployments" width="2012" height="1002" data-path="assets/images/agents/deployments.png" />
</Frame>

# State

Only deployments in the `ready` state can handle inbound or outbound calls. At any time, only one deployment is active.
Deployments that fail health checks will not receive traffic.

# Creating a deployment

Use `cartesia deploy` or push to a linked GitHub repository to create a deployment.

Cartesia servers:

1. Build the virtual environment
2. Load `main.py` and instantiate a FastAPI app
3. Run a health check
4. Set the deployment to `ready` and start receiving traffic

<Info>
  Line supports Python 3.9–3.13 (specify in `pyproject.toml`). FastAPI servers only; more frameworks coming soon.
</Info>

<Tip title="Pre-Call Initialization" icon="phone-volume">
  **Pre-Call Initialization**

  Inbound calls will ring for five seconds to allow your application logic to warm up any required resources and establish
  connections.
</Tip>