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

# Codex

> Configure Codex to use the Responses-shaped Aster provider.

## Configuration

Set your key in the terminal:

```bash theme={null}
export ASTER_API_KEY='your Aster API key'
```

Add the following to `~/.codex/config.toml`, preserving any unrelated configuration:

```toml theme={null}
model = "aster-code"
model_provider = "aster"
web_search = "disabled"

[features]
multi_agent = false

[model_providers.aster]
name = "Aster"
base_url = "https://api.asterwise.dev/v1"
env_key = "ASTER_API_KEY"
wire_api = "responses"
```

## Start conservatively

Copy the context-window and output-limit values from the authenticated Setup page. Begin with web search and multi-agent operation disabled, then validate any additional Codex feature against your installed version before relying on it.

## Next steps

* [Make a first request](/quickstart)
* [Troubleshoot your connection](/errors-fallback)