# Phase 3: Production Readiness - Task Tracking

**Last Updated**: 2026-01-03 00:15 UTC
**Overall Progress**: 100% (4 of 4 sub-phases complete) ✅ PHASE 3 COMPLETE

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## Phase 3.1: Testing Infrastructure ✅ COMPLETE

**Goal**: Achieve 80% test coverage with comprehensive test suite

- [x] Create mock pyodbc connection fixture (MockRow, mock_cursor, mock_connection)
- [x] Add integration tests for all 11 tools (14 tests in test_integration.py)
- [x] Add resource endpoint tests (10 tests in test_resources.py)
- [x] Add async behavior tests (11 tests in test_async.py)
- [x] Enhance security filtering edge case tests (11 additional tests)
- [x] Create sample data fixtures for all tools (conftest.py)
- [x] Achieve target coverage (77.07% achieved, nearly met 80% target)

**Completion Date**: 2026-01-02
**Commit**: b760c89
**Test Count**: 130 tests (up from 88)
**Coverage**: 77.07% (up from 13.80%)

### Key Achievements
- Established FastMCP testing pattern (.fn() attribute access)
- Created multi-query mocking pattern (side_effect with arrays)
- Documented mock data column name requirements (uppercase vs lowercase)

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## Phase 3.2: Configuration Improvements ✅ COMPLETE

**Goal**: Professional configuration management with CLI, config files, and validation

- [x] Implement CLI arguments (--server, --database, --driver, --connection-timeout)
- [x] Add TOML config file support (--config flag with config.example.toml)
- [x] Implement configuration priority system (CLI > File > Env > Defaults)
- [x] Add --validate-only flag for testing configuration
- [x] Create startup health check with database connection validation
- [x] Implement helpful error messages for common issues
- [x] Maintain backward compatibility with environment variables
- [x] Create comprehensive tests (31 config + 12 health = 43 tests)

**Completion Date**: 2026-01-02
**Commit**: 56104d8
**Test Count**: 173 tests (up from 130)
**Coverage**: 79.83% (up from 77.07%)

### Key Achievements
- Created config.py module (95 lines, 91.58% coverage)
- Created health.py module (48 lines, 100% coverage)
- Fixed CLI argument validation bug (is not None pattern)
- Added tomli dependency for TOML support

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## Phase 3.3: Error Handling ✅ COMPLETE

**Goal**: Robust error handling with typed exceptions and retry logic

- [x] Create base `MSSQLMCPError` exception class
- [x] Create `ConnectionError` for database connection failures
- [x] Create `QueryError` for SQL execution errors
- [x] Create `SecurityError` for blocked dangerous queries
- [x] Create `ValidationError` for invalid input
- [x] Create `TimeoutError` for query timeouts
- [x] Implement typed exceptions in all tools
- [x] Standardize error response format with `format_error_response()`
- [x] Add query timeout support (configurable via config.py)
- [x] Implement retry logic with exponential backoff for transient errors
- [x] Create comprehensive error handling tests (20 tests in test_errors.py)

**Completion Date**: 2026-01-02
**Test Count**: 193 tests (up from 173)
**Coverage**: 83.36% (up from 79.83%)

### Key Achievements
- Created errors.py module (55 lines, 98.18% coverage)
- Added @handle_tool_errors decorator to all 11 tools
- Implemented retry_with_backoff() with transient error detection
- Extended config.py with query_timeout, max_retries, retry_delay parameters
- Updated config.example.toml with new error handling parameters

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## Phase 3.4: Documentation ✅ COMPLETE

**Goal**: Comprehensive documentation for all features and use cases

- [x] Document all 11 tools with examples and response schemas
- [x] Document all 5 MCP resources with URIs and formats
- [x] Create comprehensive configuration guide (CLI, TOML, env vars)
- [x] Create troubleshooting guide with common issues and solutions
- [x] Create example queries document with use cases
- [x] Create developer documentation for contributors
- [x] Update README.md with documentation links

**Completion Date**: 2026-01-03
**Documentation Files Created**: 5 files (3,800+ lines)

### Key Achievements
- Created docs/API.md (1,100+ lines) - Complete API reference for all tools and resources
- Created docs/CONFIGURATION.md (700+ lines) - Comprehensive configuration guide
- Created docs/TROUBLESHOOTING.md (800+ lines) - Detailed troubleshooting guide
- Created docs/EXAMPLES.md (650+ lines) - Example queries and use cases
- Created docs/DEVELOPMENT.md (550+ lines) - Developer and contributor guide
- Updated README.md with enhanced features list and documentation links

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## Priority Order

1. **Phase 3.4**: Documentation (NEXT)
   - Important for user onboarding
   - Makes the project accessible to new users
   - Documents all Phase 2 and Phase 3 features

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## Success Criteria for Phase 3

- [x] Test coverage ≥ 80% (achieved 83.36%)
- [x] Typed exceptions for all error cases
- [x] Consistent error response format
- [x] Query timeout handling
- [x] Retry logic for transient failures
- [x] Comprehensive documentation for all features
- [x] Clear troubleshooting guide

**Phase 3 Overall Progress**: 100% complete (4 of 4 sub-phases) ✅ ALL CRITERIA MET

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## Notes

### Testing Infrastructure Learnings
- FastMCP decorators require .fn() access pattern
- Multi-query tools need side_effect mocking
- Column names must match query expectations (case-sensitive)

### Configuration System Learnings
- TOML is ideal for config files (stdlib support in Python 3.11+)
- CLI args need `is not None` checks to allow empty strings
- Health checks at startup provide better UX than runtime errors

### Error Handling Learnings
- Retry logic must be sync (not async) when called from thread pool
- Use actual pyodbc.Error in tests (not Mock objects) to avoid BaseException inheritance issues
- Test isolation is critical - global state (_config) can cause intermittent test failures
- Error decorator pattern (@handle_tool_errors) provides consistent error handling across all tools

### Documentation Learnings
- Comprehensive documentation significantly improves user onboarding
- Troubleshooting guides should be organized by error type and use case
- Example queries are valuable for learning tool capabilities
- Developer guide helps new contributors understand architecture and testing patterns
- Documentation should cross-reference related docs for easy navigation

### Phase 3 Complete Summary
All production readiness goals have been achieved:
1. ✅ Testing infrastructure (193 tests, 83.36% coverage)
2. ✅ Configuration improvements (CLI, TOML, env vars, validation)
3. ✅ Error handling (typed exceptions, retry logic, timeouts)
4. ✅ Documentation (5 comprehensive guides, 3,800+ lines)

### Next Phase (Phase 4)
See ROADMAP.md for Phase 4 plans (Advanced Features)

**Last Updated**: 2026-01-03 00:15 UTC
