docs: clarify Docker setup automation in README

- Emphasize that setup-docker-env scripts automatically build Docker image
- Clarify that $GEMINI_API_KEY from environment is automatically used
- Remove manual 'docker build' step from instructions
- Add clear 'To update' instructions - just run setup script again
- Update 'Why Docker' section to reflect easy updates

This makes it clearer that Docker setup is fully automated and users
don't need to run any Docker commands manually. The setup scripts
handle everything including building, cleaning old images, and
configuring the environment.

🤖 Generated with Claude Code

Co-Authored-By: Claude <noreply@anthropic.com>

README.md

@@ -109,25 +109,26 @@ setup-docker-env.bat
 ```
 
 **Important:** The setup script will:
-- Create a `.env` file for your API key
+- Create a `.env` file with your API key (automatically uses `$GEMINI_API_KEY` if already in your environment)
+- **Automatically build the Docker image for you** - no manual build needed!
+- Clean up any existing containers/images before building fresh
 - **Display the exact Claude Desktop configuration to copy** - save this output!
 - Show you where to paste the configuration
 
+**To update the app:** Simply run the setup script again - it will rebuild everything automatically.
+
 **Docker File Access:** Docker containers can only access files within mounted directories. The generated configuration mounts your home directory by default. To access files elsewhere, modify the `-v` parameter in the configuration.
 
 ```bash
-# 2. Edit .env and add your Gemini API key
+# 2. Edit .env to add your Gemini API key (if not already set in environment)
 # The .env file will contain:
 # WORKSPACE_ROOT=/your/current/directory  (automatically set)
-# GEMINI_API_KEY=your-gemini-api-key-here  (you need to update this)
+# GEMINI_API_KEY=your-gemini-api-key-here  (automatically set if $GEMINI_API_KEY exists)
 
-# 3. Build the Docker image
-docker build -t gemini-mcp-server .
-
-# 4. Copy the configuration from step 1 into Claude Desktop
+# 3. Copy the configuration from step 1 into Claude Desktop
 ```
 
-**That's it!** Docker handles all Python dependencies and environment setup for you.
+**That's it!** The setup script handles everything - building the Docker image, setting up the environment, and configuring your API key.
 
 #### Option B: Traditional Setup
 
@@ -351,7 +352,7 @@ The Docker setup provides a consistent, hassle-free experience across all platfo
 
 - **Zero Python Setup**: No need to install Python or manage virtual environments
 - **Consistent Environment**: Same behavior across Windows, macOS, and Linux
-- **Easy Updates**: Just pull the latest image or rebuild
+- **Easy Updates**: Just run the setup script again to rebuild with latest changes
 - **Isolated Dependencies**: No conflicts with your system Python packages
 
 ### Quick Setup Guide
@@ -370,21 +371,18 @@ The setup scripts do all the heavy lifting for you:
    setup-docker-env.bat
    ```
 
-2. **The script will:**
-   - Create a `.env` file with your current directory as the workspace
-   - Display the exact Claude Desktop configuration to copy
-   - Show you where to paste it
+2. **The script automatically:**
+   - Creates a `.env` file with your workspace and API key (if `$GEMINI_API_KEY` is set)
+   - **Builds the Docker image for you** - no manual `docker build` needed!
+   - Cleans up any old containers/images before building
+   - Displays the exact Claude Desktop configuration to copy
+   - Shows you where to paste it
 
-3. **Edit `.env` and add your Gemini API key**
+3. **Edit `.env` to add your Gemini API key** (only if not already in your environment)
 
-4. **Build the Docker image:**
-   ```bash
-   docker build -t gemini-mcp-server .
-   ```
+4. **Copy the configuration into Claude Desktop**
 
-5. **Copy the configuration from step 1 into Claude Desktop**
-
-That's it! The setup script generates everything you need.
+That's it! No manual Docker commands needed. **To update:** Just run the setup script again.
 
 ### How It Works