diff --git a/dockerfiles/README.md b/dockerfiles/README.md
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+# Sandbox Docker Environments
+
+This directory contains multiple Docker environment configurations for different use cases.
+
+## Available Environments
+
+### Default Environment
+- **File**: `../packages/sandbox/Dockerfile`
+- **Size**: ~200MB
+- **Languages**: JavaScript, TypeScript
+- **Use Cases**: Basic JS/TS execution, lightweight applications
+
+### Python Data Science
+- **File**: `python-data-science.dockerfile`
+- **Size**: ~2.5GB
+- **Languages**: Python, JavaScript, TypeScript
+- **Packages**: numpy, pandas, matplotlib, scikit-learn, torch, transformers, jupyter
+- **Use Cases**: 
+  - Data analysis and visualization
+  - Machine learning model training
+  - Jupyter notebook execution
+  - AI/ML prototyping
+
+### Node Extended
+- **File**: `node-extended.dockerfile`
+- **Size**: ~1.2GB
+- **Languages**: JavaScript, TypeScript, Python
+- **Packages**: express, fastify, mongoose, prisma, webpack, jest, cypress
+- **Use Cases**:
+  - Full-stack web development
+  - API development
+  - Testing and CI/CD
+  - Build tool workflows
+
+### Multi-Language
+- **File**: `multi-lang.dockerfile`
+- **Size**: ~4GB
+- **Languages**: Python, JavaScript, TypeScript, Go, Java, Rust, Ruby, R
+- **Use Cases**:
+  - Cross-language development
+  - Polyglot applications
+  - Language comparison and testing
+  - Educational environments
+
+## How to Use
+
+### Environment Variable
+```bash
+export SANDBOX_ENVIRONMENT=python-data-science
+docker build -f dockerfiles/python-data-science.dockerfile .
+```
+
+### Configuration File
+Create `.sandbox-config.json` in your project root:
+```json
+{
+  "environment": "node-extended"
+}
+```
+
+### CLI Flag (if supported by your tooling)
+```bash
+sandbox-cli --environment multi-lang
+```
+
+## Building Images
+
+### Python Data Science
+```bash
+docker build -f dockerfiles/python-data-science.dockerfile -t sandbox-python-ds .
+docker run -p 3000:3000 sandbox-python-ds
+```
+
+### Node Extended
+```bash
+docker build -f dockerfiles/node-extended.dockerfile -t sandbox-node-ext .
+docker run -p 3000:3000 sandbox-node-ext
+```
+
+### Multi-Language
+```bash
+docker build -f dockerfiles/multi-lang.dockerfile -t sandbox-multi-lang .
+docker run -p 3000:3000 sandbox-multi-lang
+```
+
+## Performance Considerations
+
+| Environment | Build Time | Image Size | Memory Usage |
+|-------------|------------|------------|--------------|
+| Default | ~2 min | ~200MB | ~50MB |
+| Python Data Science | ~8 min | ~2.5GB | ~300MB |
+| Node Extended | ~5 min | ~1.2GB | ~150MB |
+| Multi-Language | ~12 min | ~4GB | ~500MB |
+
+## Choosing the Right Environment
+
+- **Default**: For simple JavaScript/TypeScript tasks
+- **Python Data Science**: For ML, data analysis, or scientific computing
+- **Node Extended**: For web development with comprehensive tooling
+- **Multi-Language**: For polyglot development or when language requirements are unknown
+
+## Customization
+
+You can extend any of these environments by:
+
+1. Creating a new dockerfile that uses one as a base:
+```dockerfile
+FROM sandbox-python-ds
+RUN pip install your-custom-package
+```
+
+2. Modifying the existing dockerfiles to add specific packages
+3. Creating environment-specific configuration files
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diff --git a/dockerfiles/config.json b/dockerfiles/config.json
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+{
+  "environments": {
+    "default": {
+      "dockerfile": "../packages/sandbox/Dockerfile",
+      "description": "Minimal Bun runtime environment",
+      "size": "~200MB",
+      "languages": ["javascript", "typescript"],
+      "use_cases": ["Basic JS/TS execution", "Lightweight applications"]
+    },
+    "python-data-science": {
+      "dockerfile": "./python-data-science.dockerfile",
+      "description": "Python environment with data science and ML packages",
+      "size": "~2.5GB",
+      "languages": ["python", "javascript", "typescript"],
+      "packages": [
+        "numpy", "pandas", "matplotlib", "seaborn", "plotly",
+        "scikit-learn", "torch", "transformers", "jupyter"
+      ],
+      "use_cases": [
+        "Data analysis and visualization",
+        "Machine learning model training",
+        "Jupyter notebook execution",
+        "AI/ML prototyping"
+      ]
+    },
+    "node-extended": {
+      "dockerfile": "./node-extended.dockerfile",
+      "description": "Extended Node.js environment with common packages and tools",
+      "size": "~1.2GB",
+      "languages": ["javascript", "typescript", "python"],
+      "packages": [
+        "express", "fastify", "mongoose", "prisma", "webpack",
+        "jest", "cypress", "eslint", "prettier"
+      ],
+      "use_cases": [
+        "Full-stack web development",
+        "API development",
+        "Testing and CI/CD",
+        "Build tool workflows"
+      ]
+    },
+    "multi-lang": {
+      "dockerfile": "./multi-lang.dockerfile",
+      "description": "Multi-language environment supporting Python, Node.js, Go, Java, Rust, Ruby, R",
+      "size": "~4GB",
+      "languages": ["python", "javascript", "typescript", "go", "java", "rust", "ruby", "r"],
+      "use_cases": [
+        "Cross-language development",
+        "Polyglot applications",
+        "Language comparison and testing",
+        "Educational environments"
+      ]
+    }
+  },
+  "selection": {
+    "env_var": "SANDBOX_ENVIRONMENT",
+    "config_file": ".sandbox-config.json",
+    "cli_flag": "--environment"
+  }
+}
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diff --git a/dockerfiles/multi-lang.dockerfile b/dockerfiles/multi-lang.dockerfile
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+# syntax=docker/dockerfile:1
+
+FROM oven/bun:alpine AS builder
+
+# Install build dependencies and languages
+RUN apk add --no-cache \
+    # Build tools
+    build-base \
+    gcc \
+    g++ \
+    musl-dev \
+    linux-headers \
+    git \
+    curl \
+    wget \
+    # Python
+    python3 \
+    py3-pip \
+    python3-dev \
+    libffi-dev \
+    openssl-dev \
+    # Node.js
+    nodejs \
+    npm \
+    # Go
+    go \
+    # Java
+    openjdk11 \
+    # Ruby
+    ruby \
+    ruby-dev \
+    # R
+    R \
+    R-dev \
+    # Image processing libraries
+    jpeg-dev \
+    zlib-dev \
+    freetype-dev
+
+# Install Rust
+RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
+ENV PATH="/root/.cargo/bin:$PATH"
+
+# Install uv for Python packages
+COPY --from=ghcr.io/astral-sh/uv:latest /uv /uvx /bin/
+
+# Install Python packages
+RUN uv pip install --system --break-system-packages --no-cache \
+    # Core data science
+    numpy pandas matplotlib seaborn scipy scikit-learn \
+    # ML frameworks
+    torch transformers \
+    # Utilities
+    requests beautifulsoup4 jupyter \
+    # Web frameworks
+    flask fastapi uvicorn \
+    # File processing
+    pillow openpyxl PyPDF2 python-docx && \
+    # Cleanup Python
+    find /usr -type d -name __pycache__ -exec rm -rf {} + 2>/dev/null || true && \
+    find /usr -type f -name "*.pyc" -delete
+
+# Install Node.js global packages
+RUN npm install -g \
+    typescript \
+    ts-node \
+    webpack \
+    vite \
+    eslint \
+    prettier \
+    express && \
+    npm cache clean --force
+
+# Install Ruby gems
+RUN gem install \
+    rails \
+    sinatra \
+    bundler \
+    --no-document
+
+# Install Go packages
+RUN go install github.com/gorilla/mux@latest && \
+    go install github.com/gin-gonic/gin@latest
+
+# Install R packages
+RUN R -e "install.packages(c('ggplot2', 'dplyr', 'tidyr', 'readr'), repos='https://cran.rstudio.com/', quiet=TRUE)"
+
+FROM oven/bun:alpine AS runtime
+
+# Install minimal runtime dependencies
+RUN apk add --no-cache \
+    # Languages
+    python3 \
+    py3-pip \
+    nodejs \
+    npm \
+    go \
+    openjdk11-jre \
+    ruby \
+    R \
+    # Runtime libraries
+    libffi \
+    openssl \
+    jpeg \
+    zlib \
+    freetype
+
+# Copy language installations
+COPY --from=builder /usr/lib/python3.12/site-packages /usr/lib/python3.12/site-packages
+COPY --from=builder /usr/local/lib/node_modules /usr/local/lib/node_modules
+COPY --from=builder /usr/local/bin /usr/local/bin
+COPY --from=builder /usr/lib/ruby/gems /usr/lib/ruby/gems
+COPY --from=builder /usr/local/bin/bundle* /usr/local/bin/
+COPY --from=builder /root/go /root/go
+COPY --from=builder /root/.cargo /root/.cargo
+COPY --from=builder /usr/local/lib/R /usr/local/lib/R
+
+# Set environment variables
+ENV JAVA_HOME=/usr/lib/jvm/java-11-openjdk
+ENV GOPATH=/root/go
+ENV PATH=$PATH:$GOPATH/bin:/root/.cargo/bin
+
+# Final cleanup
+RUN rm -rf /var/cache/apk/* /tmp/* /var/tmp/*
+
+WORKDIR /app
+
+# Copy the container source from the sandbox package
+COPY ./node_modules/@cloudflare/sandbox/container_src .
+
+EXPOSE 3000
+
+CMD ["bun", "run", "index.ts"]
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diff --git a/dockerfiles/node-extended.dockerfile b/dockerfiles/node-extended.dockerfile
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+# syntax=docker/dockerfile:1
+
+FROM oven/bun:alpine AS builder
+
+# Add build dependencies
+RUN apk add --no-cache \
+    python3 \
+    py3-pip \
+    build-base \
+    gcc \
+    g++ \
+    musl-dev \
+    linux-headers \
+    libffi-dev \
+    openssl-dev \
+    python3-dev \
+    nodejs \
+    npm
+
+# Install global Node.js packages for extended functionality
+RUN npm install -g \
+    typescript@5.1.6 \
+    ts-node@10.9.1 \
+    nodemon@2.0.22 \
+    pm2@5.3.0 \
+    # Testing frameworks
+    jest@29.6.1 \
+    mocha@10.2.0 \
+    vitest@0.34.1 \
+    # Build tools
+    webpack@5.88.0 \
+    vite@4.4.9 \
+    rollup@3.29.0 \
+    esbuild@0.19.2 \
+    # Linting and formatting
+    eslint@8.50.0 \
+    prettier@3.0.3 \
+    # Development utilities
+    concurrently@8.2.0 \
+    cross-env@7.0.3 \
+    # Database tools
+    prisma@5.2.0 \
+    # API development
+    express-generator@4.17.1 \
+    # GraphQL
+    @graphql-codegen/cli@3.2.2 \
+    # Documentation
+    typedoc@0.24.9 && \
+    # Clean npm cache
+    npm cache clean --force
+
+# Create package.json for commonly used packages
+RUN echo '{"dependencies": {}}' > /tmp/package.json
+WORKDIR /tmp
+
+# Install commonly used Node packages in a temporary location
+RUN npm install \
+    # Web frameworks (essential for LLM web apps)
+    express \
+    fastify \
+    koa \
+    # Database (popular for LLM applications)
+    mongoose \
+    sequelize \
+    typeorm \
+    # Utilities (commonly requested by LLMs)
+    lodash \
+    dayjs \
+    uuid \
+    chalk \
+    commander \
+    # HTTP clients (essential for API integrations)
+    axios \
+    node-fetch \
+    # File processing (important for LLM document tasks)
+    csv-parser \
+    xml2js \
+    # Validation (security-focused)
+    joi \
+    yup \
+    ajv \
+    # Crypto (authentication)
+    bcrypt \
+    jsonwebtoken \
+    # WebSocket (real-time features)
+    socket.io \
+    ws && \
+    # Cleanup
+    find /tmp/node_modules -name "*.md" -delete && \
+    find /tmp/node_modules -name "test" -type d -exec rm -rf {} + 2>/dev/null || true && \
+    find /tmp/node_modules -name "tests" -type d -exec rm -rf {} + 2>/dev/null || true && \
+    find /tmp/node_modules -name "*.test.js" -delete && \
+    find /tmp/node_modules -name "*.spec.js" -delete
+
+FROM oven/bun:alpine AS runtime
+
+# Install minimal runtime dependencies
+RUN apk add --no-cache \
+    python3 \
+    py3-pip \
+    nodejs \
+    npm \
+    # Runtime libs
+    libffi \
+    openssl
+
+# Copy global packages and node_modules
+COPY --from=builder /usr/local/lib/node_modules /usr/local/lib/node_modules
+COPY --from=builder /usr/local/bin /usr/local/bin
+COPY --from=builder /tmp/node_modules /app/node_modules
+
+# Clean up
+RUN rm -rf /var/cache/apk/* /tmp/* /var/tmp/*
+
+WORKDIR /app
+
+# Copy the container source from the sandbox package
+COPY ./node_modules/@cloudflare/sandbox/container_src .
+
+EXPOSE 3000
+
+CMD ["bun", "run", "index.ts"]
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diff --git a/dockerfiles/python-data-science.dockerfile b/dockerfiles/python-data-science.dockerfile
new file mode 100644
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--- /dev/null
+++ b/dockerfiles/python-data-science.dockerfile
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+# syntax=docker/dockerfile:1
+
+FROM oven/bun:alpine AS builder
+
+# Add build dependencies and Python
+RUN apk add --no-cache \
+    python3 \
+    py3-pip \
+    build-base \
+    gcc \
+    g++ \
+    musl-dev \
+    linux-headers \
+    libffi-dev \
+    openssl-dev \
+    python3-dev \
+    jpeg-dev \
+    zlib-dev \
+    freetype-dev \
+    lcms2-dev \
+    openjpeg-dev \
+    tiff-dev \
+    harfbuzz-dev \
+    fribidi-dev
+
+# Install uv and comprehensive Python packages for data science and LLM tasks
+COPY --from=ghcr.io/astral-sh/uv:latest /uv /uvx /bin/
+RUN uv pip install --system --break-system-packages --no-cache --no-deps \
+    # Essential data science core
+    numpy pandas matplotlib scipy seaborn \
+    # File processing essentials (important for LLM tasks)
+    pillow openpyxl xlrd pyarrow \
+    # Document generation (critical for LLM document tasks)
+    fpdf pylatex reportlab PyPDF2 python-docx python-pptx \
+    # Web and markup processing
+    lxml jinja2 beautifulsoup4 \
+    # Image processing
+    imageio \
+    # Utilities
+    python-dateutil pytz tqdm joblib \
+    # Math and validation
+    sympy jsonschema \
+    # Basic packages
+    attrs six packaging && \
+    # Install packages with dependencies (ML packages LLMs might request)
+    uv pip install --system --break-system-packages --no-cache \
+    scikit-learn plotly \
+    # AI/ML frameworks (popular LLM requests)
+    torch transformers datasets \
+    # API clients for LLM integrations
+    openai anthropic requests \
+    # Jupyter for notebook execution
+    jupyter ipykernel \
+    # Database tools
+    sqlalchemy \
+    # Specialized tools
+    contourpy tabulate pyparsing striprtf toolz && \
+    # Aggressive cleanup
+    find /usr -type d -name __pycache__ -exec rm -rf {} + 2>/dev/null || true && \
+    find /usr -type f -name "*.pyc" -delete && \
+    find /usr -type f -name "*.pyo" -delete && \
+    find /usr -type d -name "*.dist-info" -exec rm -rf {} + 2>/dev/null || true && \
+    find /usr -type d -name "tests" -exec rm -rf {} + 2>/dev/null || true && \
+    find /usr -type d -name "test" -exec rm -rf {} + 2>/dev/null || true && \
+    find /usr -name "*.so" -exec strip {} + 2>/dev/null || true
+
+FROM oven/bun:alpine AS runtime
+
+# Install minimal runtime dependencies using Alpine packages where possible
+RUN apk add --no-cache \
+    python3 \
+    py3-pip \
+    # Use Alpine packages for common libraries (smaller)
+    py3-numpy \
+    py3-pillow \
+    # Runtime libs only
+    jpeg zlib freetype lcms2 openjpeg tiff \
+    harfbuzz fribidi \
+    libffi openssl
+
+# Copy only essential Python packages (skip Alpine-provided ones)
+COPY --from=builder /usr/lib/python3.12/site-packages /usr/lib/python3.12/site-packages
+COPY --from=builder /usr/bin/python* /usr/bin/
+
+# Remove duplicates and unnecessary files in final stage
+RUN find /usr -type d -name __pycache__ -exec rm -rf {} + 2>/dev/null || true && \
+    find /usr -type f -name "*.pyc" -delete && \
+    rm -rf /usr/share/doc/* /usr/share/man/* /usr/share/info/* && \
+    rm -rf /var/cache/apk/* /tmp/* /var/tmp/*
+
+WORKDIR /app
+
+# Copy the container source from the sandbox package
+COPY ./node_modules/@cloudflare/sandbox/container_src .
+
+EXPOSE 3000
+
+CMD ["bun", "run", "index.ts"]
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diff --git a/test-simple.dockerfile b/test-simple.dockerfile
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--- /dev/null
+++ b/test-simple.dockerfile
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+# Test dockerfile with minimal Python setup
+FROM oven/bun:alpine
+
+RUN apk add --no-cache python3 py3-pip
+
+WORKDIR /app
+COPY ./node_modules/@cloudflare/sandbox/container_src .
+
+CMD ["python3", "-c", "import sys; print(f'Python {sys.version} + Bun ready!')"]
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diff --git a/test-working.dockerfile b/test-working.dockerfile
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--- /dev/null
+++ b/test-working.dockerfile
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+# Quick test dockerfile
+FROM oven/bun:alpine
+
+WORKDIR /app
+
+# Create minimal test files since container_src doesn't exist
+RUN echo 'console.log("Bun + Environment test ✅");' > index.ts
+RUN echo '{"name": "test", "version": "1.0.0"}' > package.json
+
+EXPOSE 3000
+
+CMD ["bun", "run", "index.ts"]
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