diff --git a/codelabs/gke/rl-sandbox-intro/Dockerfile.gpu_worker b/codelabs/gke/rl-sandbox-intro/Dockerfile.gpu_worker
new file mode 100644
index 00000000..83400418
--- /dev/null
+++ b/codelabs/gke/rl-sandbox-intro/Dockerfile.gpu_worker
@@ -0,0 +1,25 @@
+# ==============================================================================
+# Base Image: Use the official vLLM production image. 
+# ==============================================================================
+FROM vllm/vllm-openai:latest
+
+USER root
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    build-essential \
+    numactl \
+    libnuma-dev \
+    wget \
+    ca-certificates \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install Ray, TRL, and Sandbox tools
+# TRL does not require compiling flash_attn from source.
+RUN pip install --no-cache-dir \
+    "ray[default]==2.55.1" \
+    "numpy<2.0" \
+    gymnasium>=0.28.1 \
+    k8s-agent-sandbox>=0.4.6 \
+    trl transformers packaging ninja cachetools accelerate datasets peft
diff --git a/codelabs/gke/rl-sandbox-intro/Dockerfile.sandbox b/codelabs/gke/rl-sandbox-intro/Dockerfile.sandbox
new file mode 100644
index 00000000..6dde361d
--- /dev/null
+++ b/codelabs/gke/rl-sandbox-intro/Dockerfile.sandbox
@@ -0,0 +1,49 @@
+# Use a stable Debian-based Miniconda image
+FROM condaforge/miniforge3:latest
+
+# 1. Install essential system libraries (including sqlite3 for Django tests)
+RUN apt-get update && apt-get install -y \
+    git \
+    build-essential \
+    libsqlite3-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+# 2. Set up the /workspace directory and grant ownership to the pre-existing non-root 'ubuntu' user (UID 1000)
+RUN mkdir -p /workspace \
+    && chown -R 1000:1000 /workspace
+
+# 3. Switch to the non-root user
+USER ubuntu
+WORKDIR /workspace
+
+# 4. Pre-configure Git globally so the agent can run git commands
+RUN git config --global user.email "agent@gke-sandbox.local" \
+    && git config --global user.name "Agent"
+
+# 5. Pre-clone the repository as the non-root user
+RUN git clone https://github.com/django/django.git .
+
+# 6. Pre-build Conda environments and pre-cache common dependencies
+# We do NOT run "pip install -e ." here to avoid Python version conflicts with the main branch.
+# Instead, we pre-install the heavy dependencies so that runtime installation is instantaneous.
+RUN conda create -y -n django-py39 python=3.9 \
+    && conda run -n django-py39 pip install --no-cache-dir asgiref sqlparse tzdata pytest pytest-django
+
+RUN conda create -y -n django-py310 python=3.10 \
+    && conda run -n django-py310 pip install --no-cache-dir asgiref sqlparse tzdata pytest pytest-django
+
+# --- Add Agent Server ---
+# We use a multi-stage build to copy the agent server from the official python-runtime-sandbox image
+COPY --from=registry.k8s.io/agent-sandbox/python-runtime-sandbox:v0.1.0 /app /opt/sandbox-agent
+USER root
+RUN chown -R 1000:1000 /opt/sandbox-agent \
+    && /opt/conda/bin/pip install --no-cache-dir -r /opt/sandbox-agent/requirements.txt \
+    && sed -i 's|"/app"|"/workspace"|g' /opt/sandbox-agent/main.py
+USER ubuntu
+# ------------------------
+
+# Prepend the django-py39 conda environment bin to PATH for commands executed inside the container
+ENV PATH=/home/ubuntu/.conda/envs/django-py39/bin:$PATH
+
+# Keep the container alive and run the agent server using the system Python
+CMD ["/opt/conda/bin/python3", "-m", "uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8888", "--log-level", "trace", "--app-dir", "/opt/sandbox-agent"]
diff --git a/codelabs/gke/rl-sandbox-intro/README.md b/codelabs/gke/rl-sandbox-intro/README.md
new file mode 100644
index 00000000..34adc5ed
--- /dev/null
+++ b/codelabs/gke/rl-sandbox-intro/README.md
@@ -0,0 +1,12 @@
+# High-Performance Distributed RL Sandbox
+
+This directory contains the code samples and configuration files for the Google Kubernetes Engine (GKE) codelab: **High-Performance Distributed RL Sandbox**.
+
+## Purpose
+
+These files provide a hands-on environment for setting up and running distributed Reinforcement Learning (RL) training workloads on GKE. The codelab demonstrates how to build a scalable and secure sandbox environment using Ray and GKE features like sandbox routers and warm pools.
+
+## Codelab
+
+To follow the complete step-by-step guide and learn how to use these files, please visit the full codelab:
+[High-Performance Distributed RL Sandbox](https://codelabs.developers.google.com/codelabs/gke/high-performance-distributed-rl-sandbox)
diff --git a/codelabs/gke/rl-sandbox-intro/network_policy.yaml b/codelabs/gke/rl-sandbox-intro/network_policy.yaml
new file mode 100644
index 00000000..dc32e9e2
--- /dev/null
+++ b/codelabs/gke/rl-sandbox-intro/network_policy.yaml
@@ -0,0 +1,17 @@
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: block-metadata-egress
+  namespace: default
+spec:
+  podSelector:
+    matchLabels:
+      sandbox.gke.io/runtime: gvisor
+  policyTypes:
+  - Egress
+  egress:
+  - to:
+    - ipBlock:
+        cidr: 0.0.0.0/0
+        except:
+        - 169.254.169.254/32
diff --git a/codelabs/gke/rl-sandbox-intro/raycluster.yaml b/codelabs/gke/rl-sandbox-intro/raycluster.yaml
new file mode 100644
index 00000000..484dc888
--- /dev/null
+++ b/codelabs/gke/rl-sandbox-intro/raycluster.yaml
@@ -0,0 +1,57 @@
+apiVersion: ray.io/v1
+kind: RayCluster
+metadata:
+  name: grpo-cluster
+  namespace: default
+spec:
+  rayVersion: "2.35.0"
+  headGroupSpec:
+    rayStartParams:
+      dashboard-host: "0.0.0.0"
+    template:
+      spec:
+        tolerations:
+        - key: "nvidia.com/gpu"
+          operator: "Exists"
+          effect: "NoSchedule"
+        containers:
+        - name: ray-head
+          image: us-west3-docker.pkg.dev/dx-supercomputer-testing/rl-sandbox-repo/ray-gpu-worker:v1
+          ports:
+          - containerPort: 6379
+            name: gcs-server
+          - containerPort: 8265
+            name: dashboard
+          - containerPort: 10001
+            name: client
+          resources:
+            limits:
+              cpu: "4"
+              memory: "16Gi"
+            requests:
+              cpu: "4"
+              memory: "16Gi"
+  workerGroupSpecs:
+  - groupName: gpu-group
+    replicas: 1
+    minReplicas: 1
+    maxReplicas: 1
+    rayStartParams: {}
+    template:
+      spec:
+        tolerations:
+        - key: "nvidia.com/gpu"
+          operator: "Exists"
+          effect: "NoSchedule"
+        containers:
+        - name: ray-worker
+          image: us-west3-docker.pkg.dev/dx-supercomputer-testing/rl-sandbox-repo/ray-gpu-worker:v1
+          resources:
+            limits:
+              cpu: "12"
+              memory: "120Gi"
+              nvidia.com/gpu: "1"
+            requests:
+              cpu: "12"
+              memory: "120Gi"
+              nvidia.com/gpu: "1"
diff --git a/codelabs/gke/rl-sandbox-intro/sandbox_router.yaml b/codelabs/gke/rl-sandbox-intro/sandbox_router.yaml
new file mode 100644
index 00000000..4d04bf97
--- /dev/null
+++ b/codelabs/gke/rl-sandbox-intro/sandbox_router.yaml
@@ -0,0 +1,65 @@
+apiVersion: rbac.authorization.k8s.io/v1
+kind: Role
+metadata:
+  namespace: default
+  name: sandbox-claim-manager
+rules:
+- apiGroups: ["extensions.agents.x-k8s.io"]
+  resources: ["sandboxclaims"]
+  verbs: ["get", "list", "watch", "create", "update", "patch", "delete"]
+- apiGroups: ["agents.x-k8s.io"]
+  resources: ["sandboxes"]
+  verbs: ["get", "list", "watch", "create", "update", "patch", "delete"]
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: RoleBinding
+metadata:
+  name: sandbox-claim-manager-binding
+  namespace: default
+subjects:
+- kind: ServiceAccount
+  name: default
+  namespace: default
+roleRef:
+  kind: Role
+  name: sandbox-claim-manager
+  apiGroup: rbac.authorization.k8s.io
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: sandbox-router
+  namespace: default
+spec:
+  type: ClusterIP
+  selector:
+    app: sandbox-router
+  ports:
+  - name: http
+    protocol: TCP
+    port: 8080
+    targetPort: 8080
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: sandbox-router-deployment
+  namespace: default
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: sandbox-router
+  template:
+    metadata:
+      labels:
+        app: sandbox-router
+    spec:
+      containers:
+      - name: router
+        image: us-central1-docker.pkg.dev/k8s-staging-images/agent-sandbox/sandbox-router:latest-main
+        env:
+        - name: ALLOW_UNAUTHENTICATED_ROUTER
+          value: "true"
+        ports:
+        - containerPort: 8080
diff --git a/codelabs/gke/rl-sandbox-intro/sandbox_warmpool.yaml b/codelabs/gke/rl-sandbox-intro/sandbox_warmpool.yaml
new file mode 100644
index 00000000..d1e65eb1
--- /dev/null
+++ b/codelabs/gke/rl-sandbox-intro/sandbox_warmpool.yaml
@@ -0,0 +1,25 @@
+apiVersion: extensions.agents.x-k8s.io/v1alpha1
+kind: SandboxTemplate
+metadata:
+  name: swe-bench-django
+  namespace: default
+spec:
+  podTemplate:
+    spec:
+      containers:
+      - name: sandbox
+        image: us-west3-docker.pkg.dev/dx-supercomputer-testing/rl-sandbox-repo/django-sandbox:v1
+        resources:
+          requests:
+            cpu: "2"
+            memory: "4Gi"
+---
+apiVersion: extensions.agents.x-k8s.io/v1alpha1
+kind: SandboxWarmPool
+metadata:
+  name: swe-bench-django-warmpool
+  namespace: default
+spec:
+  replicas: 10
+  sandboxTemplateRef:
+    name: swe-bench-django
diff --git a/codelabs/gke/rl-sandbox-intro/train_trl.py b/codelabs/gke/rl-sandbox-intro/train_trl.py
new file mode 100644
index 00000000..cbe116b9
--- /dev/null
+++ b/codelabs/gke/rl-sandbox-intro/train_trl.py
@@ -0,0 +1,142 @@
+import ray
+from k8s_agent_sandbox import SandboxClient
+from k8s_agent_sandbox.models import SandboxDirectConnectionConfig
+from trl import GRPOConfig, GRPOTrainer
+from transformers import AutoModelForCausalLM, AutoTokenizer
+from datasets import load_dataset
+import urllib.request
+import re
+
+ray.init(ignore_reinit_error=True)
+
+# 1. Define the Ray remote evaluation function
+@ray.remote(num_cpus=0.1)
+def evaluate_rollout(code, prompt_data):
+    client = SandboxClient(connection_config=SandboxDirectConnectionConfig(api_url="http://sandbox-router.default.svc.cluster.local:8080"))
+    
+    # Claim a pre-warmed sandbox instantly based on the repo
+    repo = prompt_data.get("repo")
+    
+    # In a full system, you'd route to different warmpools based on repo
+    # Here we default to django for our single task
+    sandbox = client.create_sandbox(
+        template="swe-bench-django",
+        warmpool="swe-bench-django-warmpool",
+        sandbox_ready_timeout=600
+    )
+    
+    try:
+        # Check if the code is correctly formatted
+        bash_match = re.search(r"```bash\n(.*?)\n```", code, re.DOTALL)
+        if not bash_match:
+            return 0.0
+            
+        script = bash_match.group(1)
+
+        # In a real environment, we would apply the base commit and install here
+        # For simplicity, we just execute the script
+        import shlex
+        script_cmd = f"bash -c {shlex.quote(script)}"
+        result = sandbox.commands.run(script_cmd, timeout=60)
+        
+        # Calculate continuous reward based on test passage ratio
+        if result.exit_code == 0:
+            return 1.0
+        
+        # Very simple heuristic reward
+        return 0.1
+        
+    finally:
+        # Clean up and release the sandbox back to the pool
+        client.delete_sandbox(sandbox.claim_name)
+
+# 2. Define the Reward Function for TRL
+def sandbox_reward_func(prompts, completions, **kwargs):
+    # Dispatch evaluation to Ray cluster
+    futures = [
+        evaluate_rollout.remote(completion, {
+            "repo": kwargs.get('repo', [])[i] if 'repo' in kwargs else None,
+            "base_commit": kwargs.get('base_commit', [])[i] if 'base_commit' in kwargs else None
+        }) for i, completion in enumerate(completions)
+    ]
+    
+    # Block and wait for all sandbox evaluations to complete
+    rewards = ray.get(futures)
+    return rewards
+
+# 3. Setup GRPO Trainer
+@ray.remote(num_gpus=1, num_cpus=8)
+def train():
+    # Load dataset
+    dataset = load_dataset("princeton-nlp/SWE-bench_Lite", split="test")
+    # Filter to our selected target issue
+    dataset = dataset.filter(lambda x: x["instance_id"] == "django__django-15388")
+    
+    def format_dataset(example):
+        files = re.findall(r'^\+\+\+ b/(.+)$', example["patch"], re.MULTILINE)
+        target_file = files[0] if files else ""
+        
+        file_content = ""
+        if target_file:
+            try:
+                github_repo = example["repo"]
+                url = f"https://raw.githubusercontent.com/{github_repo}/{example['base_commit']}/{target_file}"
+                with urllib.request.urlopen(url) as response:
+                    file_content = response.read().decode('utf-8')
+            except Exception as e:
+                pass
+                
+        prompt = f"""You are an expert software engineer.
+You are given a GitHub issue and the content of the file that contains the bug.
+Write an executable bash script that will modify the target file to fix the bug (e.g. using cat << 'EOF' > {target_file} or inline python edits).
+Wrap your bash script in ```bash ... ``` tags. Do not output raw python code directly.
+
+Target File: {target_file}
+
+Original File Content:
+```python
+{file_content}
+```
+
+Issue:
+{example['problem_statement']}
+"""
+        return {
+            "prompt": prompt,
+            "repo": example["repo"],
+            "instance_id": example["instance_id"],
+            "base_commit": example["base_commit"],
+        }
+        
+    dataset = dataset.map(format_dataset)
+
+    model_name = "Qwen/Qwen2.5-Coder-1.5B-Instruct"
+    tokenizer = AutoTokenizer.from_pretrained(model_name)
+
+    training_args = GRPOConfig(
+        output_dir="outputs",
+        learning_rate=5e-6,
+        max_steps=10,
+        per_device_train_batch_size=1,
+        gradient_accumulation_steps=4,
+        num_generations=8,
+        generation_batch_size=8,
+    )
+
+    trainer = GRPOTrainer(
+        model=model_name,
+        processing_class=tokenizer,
+        reward_funcs=[sandbox_reward_func],
+        args=training_args,
+        train_dataset=dataset,
+    )
+
+    print("Starting GRPO training with GKE Agent Sandboxes...")
+    trainer.train()
+
+def main():
+    print("Submitting training job to GPU worker...")
+    ray.get(train.remote())
+
+if __name__ == "__main__":
+    main()