MCP Memory Service

# Refactoring: handle_get_prompt() - Phase 2, Function #5 ## Summary Refactored `server.py::handle_get_prompt()` to reduce cyclomatic complexity and improve maintainability through Extract Method pattern. **Metrics:** - **Original Complexity:** 33 - **Refactored Main Function:** Complexity 6 (82% reduction) - **Original Lines:** 208 - **Refactored Main Function:** 41 lines - **Helper Functions Created:** 5 ## Refactoring Strategy: Extract Method Pattern The function contained a long if/elif/else chain handling 5 different prompt types. Each prompt type required 25-40 lines of specialized logic with high nesting and branching. ### Helper Functions Extracted #### 1. `_prompt_memory_review()` - CC: 5 **Purpose:** Handle "memory_review" prompt type **Responsibilities:** - Parse time_period and focus_area arguments - Retrieve memories from specified time period - Format memories as prompt text with tags **Location:** Lines ~1320-1347 **Input:** arguments dict **Output:** List of PromptMessage objects --- #### 2. `_prompt_memory_analysis()` - CC: 8 **Purpose:** Handle "memory_analysis" prompt type **Responsibilities:** - Parse tags and time_range arguments - Retrieve relevant memories - Analyze patterns (tag counts, memory types) - Build analysis report text **Location:** Lines ~1349-1388 **Input:** arguments dict **Output:** List of PromptMessage objects **Complexity Source:** Double-nested loops for pattern analysis (2 for loops) --- #### 3. `_prompt_knowledge_export()` - CC: 8 **Purpose:** Handle "knowledge_export" prompt type **Responsibilities:** - Parse format_type and filter criteria - Retrieve memories based on filter - Format export in JSON/Markdown/Text based on format_type - Build export text **Location:** Lines ~1390-1428 **Input:** arguments dict **Output:** List of PromptMessage objects **Complexity Source:** Multiple format branches (if/elif/else) --- #### 4. `_prompt_memory_cleanup()` - CC: 6 **Purpose:** Handle "memory_cleanup" prompt type **Responsibilities:** - Parse cleanup parameters - Find duplicate memories - Build cleanup report - Provide recommendations **Location:** Lines ~1430-1458 **Input:** arguments dict **Output:** List of PromptMessage objects **Complexity Source:** Nested loop for duplicate detection --- #### 5. `_prompt_learning_session()` - CC: 5 **Purpose:** Handle "learning_session" prompt type **Responsibilities:** - Parse topic, key_points, and questions - Create structured learning note - Store as memory - Return formatted response **Location:** Lines ~1460-1494 **Input:** arguments dict **Output:** List of PromptMessage objects --- ## Refactored `handle_get_prompt()` Function - CC: 6 **New Structure:** ```python async def handle_get_prompt(self, name: str, arguments: dict): await self._ensure_storage_initialized() # Simple dispatch to specialized handlers if name == "memory_review": messages = await self._prompt_memory_review(arguments) elif name == "memory_analysis": messages = await self._prompt_memory_analysis(arguments) # ... etc else: messages = [unknown_prompt_message] return GetPromptResult(description=..., messages=messages) ``` **Lines:** 41 (vs 208 original) **Control Flow:** Reduced from 33 branches to 6 (if/elif chain only) ## Benefits ### Code Quality - ✅ **Single Responsibility:** Each function handles one prompt type - ✅ **Testability:** Each prompt type can be unit tested independently - ✅ **Readability:** Main function is now a simple dispatcher - ✅ **Maintainability:** Changes to one prompt type isolated to its handler - ✅ **Extensibility:** Adding new prompt types requires just another elif ### Complexity Distribution ``` handle_get_prompt: CC 6 (dispatcher) _prompt_memory_review: CC 5 (simple retrieval + format) _prompt_memory_analysis: CC 8 (pattern analysis) _prompt_knowledge_export: CC 8 (multiple format branches) _prompt_memory_cleanup: CC 6 (duplicate detection) _prompt_learning_session: CC 5 (create + store) ``` **Total distributed complexity:** 38 (vs 33 monolithic) **Max function complexity:** 8 (vs 33 monolithic) - 75% reduction in peak complexity ### Maintainability Improvements - Prompt handlers are now 27-39 lines each (vs 208 for entire function) - Clear naming convention (`_prompt_<type>`) makes intent obvious - Easier to locate specific prompt logic - Reduces cognitive load when reading main function - New developers can understand each handler independently ## Backward Compatibility ✅ **Fully compatible** - No changes to: - Function signature: `handle_get_prompt(name, arguments) -> GetPromptResult` - Return values: Same GetPromptResult structure - Argument processing: Same argument parsing - All prompt types: Same behavior ## Testing Recommendations ### Unit Tests - `test_prompt_memory_review()` - Test memory retrieval + formatting - `test_prompt_memory_analysis()` - Test pattern analysis logic - `test_prompt_knowledge_export()` - Test each format (JSON/MD/text) - `test_prompt_memory_cleanup()` - Test duplicate detection - `test_prompt_learning_session()` - Test storage logic ### Integration Tests - Test all 5 prompt types through handle_get_prompt() - Verify error handling for unknown prompts - Test with various argument combinations ## Related Issues - **Issue #246:** Code Quality Phase 2 - Reduce Function Complexity - **Phase 2 Progress:** 4/27 high-risk functions completed - ✅ `install.py::main()` - Complexity 62 → ~8 - ✅ `sqlite_vec.py::initialize()` - Complexity 38 → Reduced - ✅ `install_package()` - Complexity 33 → 7 - ✅ `handle_get_prompt()` - Complexity 33 → 6 (THIS REFACTORING) ## Files Modified - `src/mcp_memory_service/server.py`: Refactored `handle_get_prompt()` with 5 helper methods ## Git Commit Use semantic commit message: ``` refactor: reduce handle_get_prompt() complexity from 33 to 6 (82% reduction) Extract prompt type handlers: - _prompt_memory_review (CC 5) - Memory retrieval + formatting - _prompt_memory_analysis (CC 8) - Pattern analysis - _prompt_knowledge_export (CC 8) - Multi-format export - _prompt_memory_cleanup (CC 6) - Duplicate detection - _prompt_learning_session (CC 5) - Learning note creation Main dispatcher now 41 lines (vs 208 original) with CC 6. All handlers individually testable and maintainable. Addresses issue #246 Phase 2, function #5 in refactoring plan. ``` ## Code Review Checklist - [x] Code compiles without errors - [x] All handlers extract correctly - [x] Dispatcher logic correct - [x] No changes to external API - [x] Backward compatible - [x] Complexity reduced - [ ] All tests pass (manual verification needed) - [ ] Integration tested ## Future Improvements 1. **Prompt Registry:** Create a dictionary-based prompt registry for even simpler dispatch 2. **Configuration:** Make prompt definitions configurable 3. **Validation:** Add argument schema validation for each prompt type 4. **Documentation:** Auto-generate prompt documentation from handler implementations