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AGENTS.md

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+# AGENTS.md
+
+## Project Overview
+
+**pymtml** is Python bindings for the Moore Threads Management Library (MTML) - a C-based API for monitoring and managing Moore Threads GPU devices. It provides:
+
+1. **Native MTML bindings** - Direct Python wrappers for libmtml.so C library functions
+2. **NVML compatibility layer** - Drop-in replacement for NVIDIA's pynvml library
+
+Moore Threads GPUs use **MUSA** (Meta-computing Unified System Architecture) as their compute platform, analogous to NVIDIA's CUDA.
+
+### Key Files
+
+- `pymtml.py` - Main library with all MTML bindings and NVML wrapper functions
+- `mtml_2.2.0.h` - C header file defining the MTML API (reference for adding new bindings)
+- `test_pymtml.py` - Tests for native MTML APIs
+- `test_pynvml.py` - Tests for NVML-compatible wrapper APIs
+- `test_sglang_compat.py` - Tests for sglang framework compatibility
+
+### NVML Compatibility
+
+Projects using pynvml can switch to pymtml with a single import change:
+
+```python
+# Replace: import pynvml
+import pymtml as pynvml
+
+# All pynvml.nvml* functions work the same
+pynvml.nvmlInit()
+device = pynvml.nvmlDeviceGetHandleByIndex(0)
+name = pynvml.nvmlDeviceGetName(device)
+pynvml.nvmlShutdown()
+```
+
+## Build and Test Commands
+
+```bash
+# Format code (isort + black)
+make format
+
+# Lint code (flake8)
+make lint
+
+# Run tests
+make test                    # pytest
+python test_pymtml.py        # Native MTML API tests
+python test_pynvml.py        # NVML wrapper tests
+python test_sglang_compat.py # sglang compatibility tests
+
+# Build wheel package
+make build
+
+# Clean build artifacts
+make clean
+
+# Publish to PyPI
+make publish
+
+# Run all (format, lint, test, build)
+make all
+```
+
+## Code Style Guidelines
+
+- **Formatter**: isort + black (not yapf)
+- **Linter**: flake8 with max-line-length=120
+- **Naming conventions**:
+  - Native MTML functions: `mtmlXxx()` (e.g., `mtmlDeviceGetName`)
+  - NVML wrapper functions: `nvmlXxx()` (e.g., `nvmlDeviceGetName`)
+  - Constants: `MTML_XXX` or `NVML_XXX`
+- **ctypes patterns**: Use `c_uint`, `c_char`, `byref()`, `POINTER()` for C bindings
+- **Error handling**: Raise `MTMLError` (aliased as `NVMLError`) for all failures
+
+## Adding New MTML Bindings
+
+1. Find the function signature in `mtml_2.2.0.h`
+2. Define any new structs in pymtml.py using `_PrintableStructure`
+3. Implement the wrapper function following existing patterns:
+
+```python
+def mtmlDeviceGetSomething(device):
+    global libHandle
+    c_result = c_uint()
+    fn = _mtmlGetFunctionPointer("mtmlDeviceGetSomething")
+    ret = fn(device, byref(c_result))
+    _mtmlCheckReturn(ret)
+    return c_result.value
+```
+
+4. Add corresponding NVML wrapper if applicable
+5. Add test cases to `test_pymtml.py` and/or `test_pynvml.py`
+
+## Testing Instructions
+
+- **Always run tests before committing**: `python test_pymtml.py && python test_pynvml.py`
+- **Tests require Moore Threads GPU hardware** with driver and libmtml.so installed
+- **Test init/shutdown cycles**: The library supports multiple init/shutdown cycles
+- **Check for segfaults**: Library shutdown must not cause crashes
+
+## Security Considerations
+
+- This library loads `libmtml.so` dynamically via ctypes
+- No network operations or external data fetching
+- GPU operations require appropriate system permissions
+- Handle device handles carefully - don't use after shutdown
+
+## Common Patterns
+
+### Library lifecycle
+```python
+mtmlLibraryInit()      # or nvmlInit()
+# ... use library ...
+mtmlLibraryShutDown()  # or nvmlShutdown()
+```
+
+### Device iteration
+```python
+count = mtmlLibraryCountDevice()
+for i in range(count):
+    device = mtmlLibraryInitDeviceByIndex(i)
+    # ... query device ...
+```
+
+### Sub-component access (GPU, Memory, VPU)
+```python
+device = mtmlLibraryInitDeviceByIndex(0)
+gpu = mtmlDeviceInitGpu(device)
+memory = mtmlDeviceInitMemory(device)
+# ... use gpu/memory ...
+mtmlDeviceFreeGpu(gpu)
+mtmlDeviceFreeMemory(memory)
+```
+
+## Known Issues
+
+- `nvmlDeviceGetCudaComputeCapability()` returns `(0, 0)` unless torch_musa is available
+- Use `patch_torch_c_for_musa()` to patch torch._C with functions from torch_musa._MUSAC
+- PCI busId field may be empty from driver; library auto-fills from sbdf if needed
+