mcp-freecad

# FreeCAD Addon Import Fixes ## Summary This document describes the fixes applied to resolve import issues in the FreeCAD AI addon that were causing errors when FreeCAD loaded the addon. ## Original Issues The FreeCAD addon was experiencing several import errors: 1. `No module named 'tools.base'` - Missing base classes for advanced tools 2. `attempted relative import beyond top-level package` - Relative imports failing when FreeCAD loads the addon 3. `cannot import name 'AssemblyToolProvider'` - Import failures in advanced tools 4. Missing core modules and incorrect import paths ## Fixes Applied ### 1. Created Missing Base Module **File**: `freecad-ai/tools/base.py` - Copied the base classes (`ToolProvider`, `ToolResult`, `ToolSchema`) from the main project - These classes are required by all advanced tools but were missing from the addon directory ### 2. Fixed Relative Import Issues **Files affected**: - `freecad-ai/events/document_events.py` - `freecad-ai/events/command_events.py` - `freecad-ai/events/error_events.py` - `freecad-ai/api/tools.py` - `freecad-ai/api/resources.py` - `freecad-ai/api/events.py` **Solution**: Added fallback import logic that tries relative imports first, then falls back to absolute imports with proper path manipulation: ```python try: from .base import EventProvider except ImportError: # Fallback for when module is loaded by FreeCAD import sys import os addon_dir = os.path.dirname(os.path.dirname(__file__)) if addon_dir not in sys.path: sys.path.insert(0, addon_dir) from events.base import EventProvider ``` ### 3. Created Missing Core Module **Files created**: - `freecad-ai/core/__init__.py` - `freecad-ai/core/server.py` - Created a minimal `MCPServer` class to resolve import issues in API modules - Provides basic functionality needed by the addon without requiring the full MCP server infrastructure ### 4. Fixed Advanced Tools Import Mapping **File**: `freecad-ai/tools/advanced/__init__.py` - Improved error handling to import each tool individually - Added proper error reporting for missing tools - Made the module more resilient to individual tool import failures ### 5. Fixed Event Handler Class Name Mapping **File**: `freecad-ai/events/__init__.py` - Fixed mapping between expected class names and actual class names: - `CommandEventHandler` → `CommandExecutionEventProvider` - `ErrorEventHandler` → `ErrorEventProvider` - `DocumentEventHandler` → `DocumentEventProvider` ### 6. Added Graceful Dependency Handling **Files affected**: - `freecad-ai/api/tools.py` - `freecad-ai/api/resources.py` - `freecad-ai/api/events.py` - `freecad-ai/tools/__init__.py` **Solution**: Added optional dependency handling for FastAPI and FreeCAD: ```python try: from fastapi import APIRouter, HTTPException FASTAPI_AVAILABLE = True except ImportError: FASTAPI_AVAILABLE = False APIRouter = None HTTPException = Exception def create_tool_router(server: MCPServer): if not FASTAPI_AVAILABLE: logger.warning("FastAPI not available, tool router disabled") return None # ... rest of function ``` ### 7. Fixed Method Signatures and Return Types **File**: `freecad-ai/tools/advanced/smithery.py` - Updated `SmitheryToolProvider` to properly implement the `ToolProvider` interface - Added missing `tool_schema` property - Fixed return types to use `ToolResult` instead of raw dictionaries - Updated all method signatures to match the base class ### 8. Updated Path References **File**: `freecad-ai/clients/cursor_mcp_bridge.py` - Fixed paths to locate the main MCP server script correctly - Added fallback paths for different deployment scenarios ### 9. Fixed API Function Import Names (FINAL FIX) **Files**: - `freecad-ai/api/__init__.py` - `freecad-ai/freecad_ai_workbench.py` **Issue**: The API module was trying to import non-existent function names: - `ToolsAPI` (should be `create_tool_router`) - `ResourcesAPI` (should be `create_resource_router`) - `EventsAPI` (should be `create_event_router`) **Solution**: Updated import mappings in both files to use the correct function names that actually exist in the respective modules. ## Testing A comprehensive test script was created (`test_imports.py`) to verify all import fixes: ```bash python test_imports.py ``` **Results**: - ✅ All core modules import successfully - ✅ Event handlers load correctly - ✅ API modules handle missing dependencies gracefully - ✅ Advanced tools import properly (when FreeCAD is available) - ✅ Client modules load with appropriate warnings for missing dependencies ## Deployment The fixes ensure that: 1. **FreeCAD Addon Loading**: The addon loads correctly when FreeCAD starts up 2. **Graceful Degradation**: Missing dependencies (like FastAPI) don't break the entire addon 3. **Development Workflow**: The symlink-based development workflow continues to work 4. **Error Reporting**: Clear error messages help diagnose any remaining issues ## Commands to Verify Fixes 1. **Sync the addon**: `python scripts/sync_addon.py` 2. **Test imports**: `python test_imports.py` 3. **Start FreeCAD**: The addon should now load without import errors The import errors that were previously shown in the FreeCAD console should now be resolved.