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+---
+description: "Build C++ pybind11 extension (ddbc_bindings)"
+name: "mssql-python-build"
+agent: 'agent'
+model: Claude Sonnet 4.5 (copilot)
+---
+# Build DDBC Extensions Prompt for microsoft/mssql-python
+
+You are a development assistant helping rebuild the DDBC C++ pybind11 extensions for the mssql-python driver.
+
+## PREREQUISITES
+
+> ⚠️ **This prompt assumes your development environment is already set up.**
+> If you haven't set up your environment yet, use `#setup-dev-env` first.
+
+**Quick sanity check:**
+```bash
+# Verify venv is active
+if [ -z "$VIRTUAL_ENV" ]; then
+    echo "❌ No virtual environment active. Run: source myvenv/bin/activate"
+    exit 1
+fi
+
+# Verify pybind11 is installed
+python -c "import pybind11; print('✅ Ready to build with Python', __import__('sys').version.split()[0])"
+```
+
+**Important:** The C++ extension will be built for the active Python version. Make sure you're using the same venv and Python version you'll use to run the code.
+
+---
+
+## TASK
+
+Help the developer rebuild the DDBC bindings after making C++ code changes. Follow this process sequentially.
+
+---
+
+## STEP 0: Understand What You're Building
+
+### What Are DDBC Bindings?
+
+The `ddbc_bindings` module is a **C++ pybind11 extension** that provides:
+- Low-level ODBC connectivity to SQL Server
+- High-performance database operations
+- Platform-specific optimizations
+
+### When to Rebuild
+
+- ✅ After modifying any `.cpp` or `.h` files in `mssql_python/pybind/`
+- ✅ After changing `CMakeLists.txt`
+- ✅ After upgrading Python version
+- ✅ After pulling changes that include C++ modifications
+- ❌ After Python-only changes (no rebuild needed)
+
+### Key Files
+
+```
+mssql_python/pybind/
+├── ddbc_bindings.cpp      # Main bindings implementation
+├── ddbc_bindings.h        # Header file
+├── logger_bridge.cpp      # Python logging bridge
+├── logger_bridge.hpp      # Logger header
+├── connection/            # Connection implementation
+│   ├── connection.cpp
+│   ├── connection.h
+│   ├── connection_pool.cpp
+│   └── connection_pool.h
+├── CMakeLists.txt         # CMake build configuration
+├── build.sh               # macOS/Linux build script
+└── build.bat              # Windows build script
+```
+
+---
+
+## STEP 1: Build the Extension
+
+### 1.1 Run Build Script
+
+**Important:** The commands below will automatically return to the repository root after building.
+
+#### macOS / Linux
+
+```bash
+# Standard build
+cd mssql_python/pybind && ./build.sh && cd ../..
+
+# Build with code coverage instrumentation (Linux only)
+cd mssql_python/pybind && ./build.sh codecov && cd ../..
+```
+
+#### Windows (in Developer Command Prompt)
+
+```cmd
+cd mssql_python\pybind && build.bat && cd ..\..
+```
+
+### 1.2 What the Build Does
+
+1. **Cleans** existing `build/` directory
+2. **Detects** Python version and architecture
+3. **Configures** CMake with correct paths
+4. **Compiles** C++ code to platform-specific extension
+5. **Copies** the built extension to `mssql_python/` directory
+6. **Signs** the extension (macOS only - for SIP compliance)
+7. **Returns** to repository root directory
+
+**Output files by platform:**
+| Platform | Output File |
+|----------|-------------|
+| macOS | `ddbc_bindings.cp{version}-universal2.so` |
+| Linux | `ddbc_bindings.cp{version}-{arch}.so` |
+| Windows | `ddbc_bindings.cp{version}-{arch}.pyd` |
+
+---
+
+## STEP 2: Verify the Build
+
+**These commands assume you're at the repository root** (which you should be after Step 1).
+
+### 2.1 Check Output File Exists
+
+```bash
+# macOS/Linux
+ls -la mssql_python/ddbc_bindings.*.so
+
+# Windows
+dir mssql_python\ddbc_bindings.*.pyd
+```
+
+### 2.2 Verify Import Works
+
+```bash
+python -c "from mssql_python import connect; print('✅ Import successful')"
+```
+
+---
+
+## STEP 3: Clean Build (If Needed)
+
+If you need a completely fresh build:
+
+```bash
+# From repository root
+rm -rf mssql_python/pybind/build/
+rm -f mssql_python/ddbc_bindings.*.so
+rm -f mssql_python/ddbc_bindings.*.pyd
+
+# Rebuild
+cd mssql_python/pybind
+./build.sh  # or build.bat on Windows
+```
+
+---
+
+## Troubleshooting
+
+### ❌ "CMake configuration failed"
+
+**Cause:** CMake can't find Python or pybind11 paths
+
+**Fix:**
+```bash
+# Verify Python include directory exists
+python -c "import sysconfig; print(sysconfig.get_path('include'))"
+ls $(python -c "import sysconfig; print(sysconfig.get_path('include'))")
+
+# Verify pybind11 include directory exists
+python -c "import pybind11; print(pybind11.get_include())"
+ls $(python -c "import pybind11; print(pybind11.get_include())")
+```
+
+If pybind11 path doesn't exist, run: `pip install pybind11`
+
+### ❌ "pybind11 not found" during build
+
+**Cause:** pybind11 not installed in active venv
+
+**Fix:**
+```bash
+# Ensure venv is active
+source myvenv/bin/activate  # adjust path if needed
+
+# Install pybind11
+pip install pybind11
+
+# Verify
+python -c "import pybind11; print(pybind11.get_include())"
+```
+
+### ❌ "sql.h not found" (macOS)
+
+**Cause:** ODBC development headers not installed
+
+**Fix:**
+```bash
+# Install Microsoft ODBC Driver (provides headers)
+brew tap microsoft/mssql-release https://github.com/Microsoft/homebrew-mssql-release
+ACCEPT_EULA=Y brew install msodbcsql18
+
+# Or specify custom path
+export ODBC_INCLUDE_DIR=/path/to/odbc/headers
+./build.sh
+```
+
+### ❌ "undefined symbol" errors at runtime
+
+**Cause:** Built with different Python than you're running
+
+**Fix:**
+```bash
+# Check which Python was used to build (look at output filename)
+ls mssql_python/ddbc_bindings.*.so
+# e.g., ddbc_bindings.cp313-universal2.so means Python 3.13
+
+# Check current Python
+python --version
+
+# If mismatch, rebuild with correct Python
+rm -rf mssql_python/pybind/build/
+cd mssql_python/pybind
+./build.sh
+```
+
+### ❌ "cmake is not recognized" (Windows)
+
+**Cause:** Not using Developer Command Prompt
+
+**Fix:**
+1. Close current terminal
+2. Open **Start Menu** → search "Developer Command Prompt for VS 2022"
+3. Navigate to project: `cd C:\path\to\mssql-python\mssql_python\pybind`
+4. Run: `build.bat`
+
+### ❌ "codesign failed" (macOS)
+
+**Cause:** macOS SIP (System Integrity Protection) issues
+
+**Fix:** The build script handles this automatically. If issues persist:
+```bash
+codesign -s - -f mssql_python/ddbc_bindings.*.so
+```
+
+### ❌ Build succeeds but import fails
+
+**Cause:** Usually path issues or old cached files
+
+**Fix:**
+```bash
+# Clear Python cache
+find . -type d -name __pycache__ -exec rm -rf {} + 2>/dev/null
+
+# Clear any .pyc files
+find . -name "*.pyc" -delete
+
+# Reinstall in dev mode
+pip install -e .
+
+# Try import again
+python -c "from mssql_python import connect; print('✅ OK')"
+```
+
+### ❌ "Permission denied" running build.sh
+
+**Fix:**
+```bash
+chmod +x mssql_python/pybind/build.sh
+./build.sh
+```
+
+### ❌ Build takes too long / seems stuck
+
+**Cause:** Universal binary build on macOS compiles for both architectures
+
+**Info:** This is normal. macOS builds for both arm64 and x86_64. First build takes longer, subsequent builds use cache.
+
+**If truly stuck (>10 minutes):**
+```bash
+# Cancel with Ctrl+C, then clean and retry
+rm -rf build/
+./build.sh
+```
+
+---
+
+## Quick Reference
+
+### One-Liner Build Commands
+
+```bash
+# macOS/Linux - Full rebuild from repo root
+cd mssql_python/pybind && rm -rf build && ./build.sh && cd ../.. && python -c "from mssql_python import connect; print('✅ Build successful')"
+```
+
+### Build Output Naming Convention
+
+| Platform | Python | Architecture | Output File |
+|----------|--------|--------------|-------------|
+| macOS | 3.13 | Universal | `ddbc_bindings.cp313-universal2.so` |
+| Linux | 3.12 | x86_64 | `ddbc_bindings.cp312-x86_64.so` |
+| Linux | 3.11 | ARM64 | `ddbc_bindings.cp311-arm64.so` |
+| Windows | 3.13 | x64 | `ddbc_bindings.cp313-amd64.pyd` |
+| Windows | 3.12 | ARM64 | `ddbc_bindings.cp312-arm64.pyd` |
+
+---
+
+## After Building
+
+Once the build succeeds:
+
+1. **Run tests** → Use `#run-tests`
+2. **Test manually** with a connection to SQL Server
+3. **Create a PR** with your C++ changes → Use `#create-pr`