docs: document environment variables for cloud services (#1048)

1 files changed, 20 insertions, 0 deletions

diff --git a/docs/cli/configuration.md b/docs/cli/configuration.md
index f7925725..587ad071 100644
--- a/docs/cli/configuration.md
+++ b/docs/cli/configuration.md
@@ -209,6 +209,26 @@ The CLI automatically loads environment variables from an `.env` file. The loadi
   - Specifies the default Gemini model to use.
   - Overrides the hardcoded default, which is currently `gemini-2.5-pro-preview-05-06`.
   - Example: `export GEMINI_MODEL="gemini-1.5-flash-latest"`
+- **`GOOGLE_API_KEY`**:
+  - Your Google Cloud API key.
+  - Required for using Vertex AI in express mode.
+  - Ensure you have the necessary permissions and set the `GOOGLE_GENAI_USE_VERTEXAI=true` environment variable.
+  - Example: `export GOOGLE_API_KEY="YOUR_GOOGLE_API_ KEY"`.
+- **`GOOGLE_CLOUD_PROJECT`**:
+  - Your Google Cloud Project ID.
+  - Required for using Code Assist, Telemetry or Vertex AI.
+  - If using Vertex AI, ensure you have the necessary permissions and set the `GOOGLE_GENAI_USE_VERTEXAI=true` environment variable.
+  - Example: `export GOOGLE_CLOUD_PROJECT="YOUR_PROJECT_ID"`.
+- **`GOOGLE_CLOUD_LOCATION`**:
+  - Your Google Cloud Project Location (e.g., us-central1).
+  - Required for using Vertex AI in non express mode.
+  - If using Vertex AI, ensure you have the necessary permissions and set the `GOOGLE_GENAI_USE_VERTEXAI=true` environment variable.
+  - Example: `export GOOGLE_CLOUD_LOCATION="YOUR_PROJECT_LOCATION"`.
+- **`GEMINI_CODE_ASSIST`**:
+  - Enables Code Assist functionality.
+  - Accepts `true`, `false`, or a custom command string.
+  - If you are using an Enterprise account you should also set the `GOOGLE_CLOUD_PROJECT` environment variable.
+  - Example: `export GEMINI_CODE_ASSIST=true`.
 - **`GEMINI_SANDBOX`**:
   - Alternative to the `sandbox` setting in `settings.json`.
   - Accepts `true`, `false`, `docker`, `podman`, or a custom command string.