diff --git a/samples/agent/adk/contact_lookup/.env.example b/samples/agent/adk/contact_lookup/.env.example
new file mode 100644
index 00000000..c4522b4e
--- /dev/null
+++ b/samples/agent/adk/contact_lookup/.env.example
@@ -0,0 +1,7 @@
+# Copy this file to .env and fill in your API key
+# Get your API key at: https://aistudio.google.com/apikey
+
+GEMINI_API_KEY=your_gemini_api_key_here
+
+# Optional: Use Vertex AI instead of Gemini API
+# GOOGLE_GENAI_USE_VERTEXAI=TRUE
diff --git a/samples/agent/adk/contact_lookup/README.md b/samples/agent/adk/contact_lookup/README.md
index 976d6200..bf0ab276 100644
--- a/samples/agent/adk/contact_lookup/README.md
+++ b/samples/agent/adk/contact_lookup/README.md
@@ -19,7 +19,8 @@ This sample uses the Agent Development Kit (ADK) along with the A2A protocol to
 2. Create an environment file with your API key:
 
    ```bash
-   echo "GEMINI_API_KEY=your_api_key_here" > .env
+   cp .env.example .env
+   # Edit .env with your actual API key (do not commit .env)
    ```
 
 3. Run the server:
diff --git a/samples/agent/adk/orchestrator/.env.example b/samples/agent/adk/orchestrator/.env.example
new file mode 100644
index 00000000..c4522b4e
--- /dev/null
+++ b/samples/agent/adk/orchestrator/.env.example
@@ -0,0 +1,7 @@
+# Copy this file to .env and fill in your API key
+# Get your API key at: https://aistudio.google.com/apikey
+
+GEMINI_API_KEY=your_gemini_api_key_here
+
+# Optional: Use Vertex AI instead of Gemini API
+# GOOGLE_GENAI_USE_VERTEXAI=TRUE
diff --git a/samples/agent/adk/orchestrator/README.md b/samples/agent/adk/orchestrator/README.md
index 58cae833..23538c89 100644
--- a/samples/agent/adk/orchestrator/README.md
+++ b/samples/agent/adk/orchestrator/README.md
@@ -19,8 +19,8 @@ Subagents are configured using RemoteA2aAgent which translates ADK events to A2A
 1. Create an environment file with your API key:
 
    ```bash
-   echo "GEMINI_API_KEY=your_api_key_here" > .env
-
+   cp .env.example .env
+   # Edit .env with your actual API key (do not commit .env)
    ```
 
 2. Run subagents
diff --git a/samples/agent/adk/restaurant_finder/.env.example b/samples/agent/adk/restaurant_finder/.env.example
new file mode 100644
index 00000000..c4522b4e
--- /dev/null
+++ b/samples/agent/adk/restaurant_finder/.env.example
@@ -0,0 +1,7 @@
+# Copy this file to .env and fill in your API key
+# Get your API key at: https://aistudio.google.com/apikey
+
+GEMINI_API_KEY=your_gemini_api_key_here
+
+# Optional: Use Vertex AI instead of Gemini API
+# GOOGLE_GENAI_USE_VERTEXAI=TRUE
diff --git a/samples/agent/adk/restaurant_finder/README.md b/samples/agent/adk/restaurant_finder/README.md
index 88596b71..0d1b7110 100644
--- a/samples/agent/adk/restaurant_finder/README.md
+++ b/samples/agent/adk/restaurant_finder/README.md
@@ -19,7 +19,8 @@ This sample uses the Agent Development Kit (ADK) along with the A2A protocol to
 2. Create an environment file with your API key:
 
    ```bash
-   echo "GEMINI_API_KEY=your_api_key_here" > .env
+   cp .env.example .env
+   # Edit .env with your actual API key (do not commit .env)
    ```
 
 3. Run the agent server:
diff --git a/samples/agent/adk/rizzcharts/.env.example b/samples/agent/adk/rizzcharts/.env.example
new file mode 100644
index 00000000..c4522b4e
--- /dev/null
+++ b/samples/agent/adk/rizzcharts/.env.example
@@ -0,0 +1,7 @@
+# Copy this file to .env and fill in your API key
+# Get your API key at: https://aistudio.google.com/apikey
+
+GEMINI_API_KEY=your_gemini_api_key_here
+
+# Optional: Use Vertex AI instead of Gemini API
+# GOOGLE_GENAI_USE_VERTEXAI=TRUE
diff --git a/samples/agent/adk/rizzcharts/README.md b/samples/agent/adk/rizzcharts/README.md
index 5fd542e4..b158d72a 100644
--- a/samples/agent/adk/rizzcharts/README.md
+++ b/samples/agent/adk/rizzcharts/README.md
@@ -19,8 +19,8 @@ This sample uses the Agent Development Kit (ADK) along with the A2A protocol to
 2. Create an environment file with your API key:
 
    ```bash
-   echo "GEMINI_API_KEY=your_api_key_here" > .env
-
+   cp .env.example .env
+   # Edit .env with your actual API key (do not commit .env)
    ```
 
 3. Run an agent:
diff --git a/samples/client/angular/README.md b/samples/client/angular/README.md
index ebd17555..1f048908 100644
--- a/samples/client/angular/README.md
+++ b/samples/client/angular/README.md
@@ -13,10 +13,9 @@ NOTE: [For the rizzcharts app](../../agent/adk/rizzcharts/), you will need Googl
 Here is the quickstart for the restaurant app:
 
 ```bash
-# Export your Gemini API key
-export GEMINI_API_KEY=your_gemini_api_key
-echo "export GEMINI_API_KEY=your_gemini_api_key" >> .env
-cp .env ../../agent/adk/restaurant_finder/.env
+# Set up your Gemini API key
+cp ../../agent/adk/restaurant_finder/.env.example ../../agent/adk/restaurant_finder/.env
+# Edit the .env file with your actual API key (do not commit .env)
 
 # Start the restaurant app frontend
 npm install 
diff --git a/specification/0.8/eval/.env.example b/specification/0.8/eval/.env.example
new file mode 100644
index 00000000..68337df8
--- /dev/null
+++ b/specification/0.8/eval/.env.example
@@ -0,0 +1,11 @@
+# Copy this file to .env and fill in your API keys
+# You only need keys for the models you want to test
+
+# Gemini API Key - https://aistudio.google.com/apikey
+GEMINI_API_KEY=your_gemini_api_key_here
+
+# OpenAI API Key - https://platform.openai.com/api-keys
+OPENAI_API_KEY=your_openai_api_key_here
+
+# Anthropic API Key - https://console.anthropic.com/settings/keys
+ANTHROPIC_API_KEY=your_anthropic_api_key_here
diff --git a/specification/0.8/eval/README.md b/specification/0.8/eval/README.md
index fbef16d3..5620d92b 100644
--- a/specification/0.8/eval/README.md
+++ b/specification/0.8/eval/README.md
@@ -12,6 +12,13 @@ To use the models, you need to set the following environment variables with your
 
 You can set these in a `.env` file in the root of the project, or in your shell's configuration file (e.g., `.bashrc`, `.zshrc`).
 
+A `.env.example` file is provided as a template:
+
+```bash
+cp .env.example .env
+# Edit .env with your API keys (do not commit .env)
+```
+
 You also need to install dependencies before running:
 
 ```bash
diff --git a/specification/0.9/eval/.env.example b/specification/0.9/eval/.env.example
new file mode 100644
index 00000000..68337df8
--- /dev/null
+++ b/specification/0.9/eval/.env.example
@@ -0,0 +1,11 @@
+# Copy this file to .env and fill in your API keys
+# You only need keys for the models you want to test
+
+# Gemini API Key - https://aistudio.google.com/apikey
+GEMINI_API_KEY=your_gemini_api_key_here
+
+# OpenAI API Key - https://platform.openai.com/api-keys
+OPENAI_API_KEY=your_openai_api_key_here
+
+# Anthropic API Key - https://console.anthropic.com/settings/keys
+ANTHROPIC_API_KEY=your_anthropic_api_key_here
diff --git a/specification/0.9/eval/README.md b/specification/0.9/eval/README.md
index 8e02d8ae..c85af9b4 100644
--- a/specification/0.9/eval/README.md
+++ b/specification/0.9/eval/README.md
@@ -14,6 +14,13 @@ To use the models, you need to set the following environment variables with your
 
 You can set these in a `.env` file in the root of the project, or in your shell's configuration file (e.g., `.bashrc`, `.zshrc`).
 
+A `.env.example` file is provided as a template:
+
+```bash
+cp .env.example .env
+# Edit .env with your API keys (do not commit .env)
+```
+
 You also need to install dependencies before running:
 
 ```bash