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Update authentication.md to show how to use API keys in GCP (#3042) 

Co-authored-by: Pascal Birchler <pascalb@google.com>
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chrisheecho 2025-07-11 06:25:11 -07:00 committed by GitHub
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@ -40,9 +40,19 @@ The Gemini CLI requires you to authenticate with Google's AI services. On initia
```
3. **Vertex AI:**
- If not using express mode:
- Obtain your Google Cloud API key: [Get an API Key](https://cloud.google.com/vertex-ai/generative-ai/docs/start/api-keys?usertype=newuser)
- Set the `GOOGLE_API_KEY` environment variable. In the following methods, replace `YOUR_GOOGLE_API_KEY` with your Vertex AI API key:
- You can temporarily set these environment variables in your current shell session using the following commands:
```bash
export GOOGLE_API_KEY="YOUR_GOOGLE_API_KEY"
```
- For repeated use, you can add the environment variables to your [.env file](#persisting-environment-variables-with-env-files) or your shell's configuration file (like `~/.bashrc`, `~/.zshrc`, or `~/.profile`). For example, the following commands add the environment variables to a `~/.bashrc` file:
```bash
echo 'export GOOGLE_API_KEY="YOUR_GOOGLE_API_KEY"' >> ~/.bashrc
source ~/.bashrc
```
- To use Application Default Credentials (ADC), use the following command:
- Ensure you have a Google Cloud project and have enabled the Vertex AI API.
- Set up Application Default Credentials (ADC), using the following command:
```bash
gcloud auth application-default login
```
@ -59,17 +69,6 @@ The Gemini CLI requires you to authenticate with Google's AI services. On initia
echo 'export GOOGLE_CLOUD_LOCATION="YOUR_PROJECT_LOCATION"' >> ~/.bashrc
source ~/.bashrc
```
- If using express mode:
- Set the `GOOGLE_API_KEY` environment variable. In the following methods, replace `YOUR_GOOGLE_API_KEY` with your Vertex AI API key provided by express mode:
- You can temporarily set these environment variables in your current shell session using the following commands:
```bash
export GOOGLE_API_KEY="YOUR_GOOGLE_API_KEY"
```
- For repeated use, you can add the environment variables to your [.env file](#persisting-environment-variables-with-env-files) or your shell's configuration file (like `~/.bashrc`, `~/.zshrc`, or `~/.profile`). For example, the following commands add the environment variables to a `~/.bashrc` file:
```bash
echo 'export GOOGLE_API_KEY="YOUR_GOOGLE_API_KEY"' >> ~/.bashrc
source ~/.bashrc
```
4. **Cloud Shell:**
- This option is only available when running in a Google Cloud Shell environment.
- It automatically uses the credentials of the logged-in user in the Cloud Shell environment.