MCP Background Job Server

# MCP Background Job Server - Implementation TODO ## Phase 1: Project Setup ✅ COMPLETED - [x] Initialize Python project structure - [x] Initialize project (`uv init`) - [x] Initialize virtual environment (`uv venv`) - [x] Add & configure dev dependencies (pytest, ruff, etc.) (`uv add`) - [x] Set up src/mcp_background_job package structure - [x] Set up development environment - [x] Sync dependencies (`uv sync`) - [x] Configure pytest.ini for test discovery - [x] Set up logging configuration ## Phase 2: Core Data Models ✅ COMPLETED - [x] Define Pydantic models - [x] JobStatus enum - [x] BackgroundJob model - [x] JobSummary model - [x] ProcessOutput model - [x] All tool input/output models - [x] Create configuration model - [x] BackgroundJobConfig with environment defaults - [x] Configuration loading and validation ## Phase 3: Process Management Layer ✅ COMPLETED - [x] Implement ProcessWrapper class - [x] Process creation with proper I/O handling - [x] Stdout/stderr buffering with ring buffer - [x] Process status monitoring - [x] Input sending to stdin - [x] Process termination handling - [x] Add output management - [x] Tail functionality for last N lines - [x] Full output retrieval - [x] Buffer size management and cleanup ## Phase 4: Job Manager Service ✅ COMPLETED - [x] Implement JobManager class - [x] Job registry with in-memory storage - [x] UUID generation for job IDs - [x] Job lifecycle management - [x] Core job operations - [x] execute_command method - [x] get_job_status method - [x] list_jobs method - [x] get_job_output method - [x] tail_job_output method - [x] Advanced job operations - [x] kill_job method - [x] interact_with_job method - [x] cleanup_completed_jobs method ## Phase 5: MCP Tool Implementation ✅ COMPLETED - [x] Set up FastMCP server - [x] Server initialization and configuration - [x] Error handling with ToolError - [x] Implement read-only tools - [x] list tool - show all jobs - [x] status tool - get job status - [x] output tool - get full job output - [x] tail tool - get recent output lines - [x] Implement interactive tools - [x] execute tool - start new background job - [x] interact tool - send input to job - [x] kill tool - terminate job ## Phase 6: Error Handling & Validation - [ ] Custom exception classes - [ ] JobNotFoundError - [ ] JobAlreadyTerminatedError - [ ] ProcessExecutionError - [ ] Input validation and sanitization - [ ] Command validation - [ ] Job ID format validation - [ ] Parameter bounds checking - [ ] Error response formatting - [ ] Consistent error messages - [ ] Proper HTTP status codes for MCP errors ## Phase 7: Security & Resource Management - [ ] Command security - [ ] Command allowlist/blocklist implementation - [ ] Shell injection prevention - [ ] Path traversal protection - [ ] Resource limits - [ ] Maximum concurrent jobs enforcement - [ ] Memory usage monitoring - [ ] Process timeout handling - [ ] Cleanup mechanisms - [ ] Automatic cleanup of old jobs - [ ] Resource leak prevention - [ ] Graceful shutdown handling ## Phase 8: Testing Infrastructure - [ ] Unit test setup - [ ] Test fixtures for jobs and processes - [ ] Mock subprocess for isolated testing - [ ] Test utilities and helpers - [ ] Core functionality tests - [ ] JobManager unit tests - [ ] ProcessWrapper unit tests - [ ] Data model validation tests - [ ] MCP tool integration tests - [ ] Tool execution tests - [ ] Error handling tests - [ ] Input/output validation tests ## Phase 9: Integration Testing - [ ] End-to-end workflow tests - [ ] Execute → status → output → kill workflow - [ ] Execute → interact → output workflow - [ ] Concurrent job handling tests - [ ] Long-running process tests - [ ] Jobs that run for extended periods - [ ] Memory usage over time - [ ] Output buffering under load - [ ] Edge case testing - [ ] Invalid job IDs - [ ] Already terminated processes - [ ] Resource exhaustion scenarios ## Phase 10: Documentation & Examples - [ ] Code documentation - [ ] Docstrings for all public methods - [ ] Type hints validation - [ ] API documentation generation - [ ] Usage examples - [ ] Update README with usage examples - [ ] Integration examples for common use cases - [ ] Configuration examples ## Phase 11: Performance & Monitoring - [ ] Performance optimization - [ ] Output buffer efficiency - [ ] Process monitoring overhead - [ ] Memory usage optimization - [ ] Logging and monitoring - [ ] Structured logging implementation - [ ] Performance metrics collection - [ ] Health check endpoints ## Phase 12: Production Readiness - [ ] Configuration management - [ ] Environment variable handling - [ ] Configuration file support - [ ] Default value validation - [ ] Deployment preparation - [ ] Transport configuration (stdio/HTTP) - [ ] CORS handling for HTTP transport - [ ] Production logging setup - [ ] Final testing and validation - [ ] Load testing with multiple clients - [ ] Security audit of command execution - [ ] Memory leak testing