Zerion MCP Server

## 1. Configuration System - [x] 1.1 Create `zerion_mcp_server/config.py` with ConfigManager class - [x] 1.2 Add support for YAML config file loading - [x] 1.3 Add environment variable overrides - [x] 1.4 Add validation for required fields - [x] 1.5 Update `__init__.py` to use ConfigManager - [x] 1.6 Create example config file `config.example.yaml` ## 2. Logging Infrastructure - [x] 2.1 Create `zerion_mcp_server/logger.py` with structured logging setup - [x] 2.2 Add log levels configuration (DEBUG, INFO, WARN, ERROR) - [x] 2.3 Add request/response logging - [x] 2.4 Add performance timing logs - [x] 2.5 Integrate logging into main server code ## 3. Error Handling - [x] 3.1 Add try-catch blocks for OpenAPI spec loading - [x] 3.2 Add error handling for HTTP client failures - [x] 3.3 Add validation for API responses - [x] 3.4 Add custom exception classes (ConfigError, APIError, ValidationError) - [x] 3.5 Add user-friendly error messages with troubleshooting hints - [x] 3.6 Add graceful degradation for non-critical failures ## 4. Testing Infrastructure - [x] 4.1 Add pytest and pytest-asyncio to pyproject.toml - [x] 4.2 Create `tests/` directory structure - [x] 4.3 Add `tests/conftest.py` with fixtures - [x] 4.4 Write unit tests for configuration loading (`tests/test_config.py`) - [x] 4.5 Write unit tests for error handling (`tests/test_errors.py`) - [x] 4.6 Create mock API fixtures for integration tests - [x] 4.7 Write integration tests (`tests/test_integration.py`) - [x] 4.8 Add test coverage reporting ## 5. Documentation - [x] 5.1 Expand README.md with project overview - [x] 5.2 Add installation instructions - [x] 5.3 Add configuration guide - [x] 5.4 Add usage examples (basic queries, error scenarios) - [x] 5.5 Add troubleshooting section - [x] 5.6 Add API reference (link to Zerion docs) - [x] 5.7 Add contributing guidelines - [x] 5.8 Create CHANGELOG.md ## 6. CI/CD (Optional) - [ ] 6.1 Create GitHub Actions workflow for tests - [ ] 6.2 Add linting (ruff/flake8) - [ ] 6.3 Add type checking (mypy)