StartWithUML is an AI software architecture platform designed to assist developers and architects in creating, maintaining, and synchronizing PlantUML diagrams. The tool integrates artificial intelligence to generate diagrams from natural language descriptions, explain existing diagrams, identify and fix errors, and keep visual representations aligned with evolving codebases. By connecting with AI coding agents through the Model Context Protocol (MCP), StartWithUML aims to establish software architecture as a single source of truth throughout the development lifecycle. The platform’s core capabilities include AI powered diagram generation, where users can describe a system or component in plain text and receive a corresponding PlantUML diagram. It also offers diagram explanation, allowing users to upload or reference an existing diagram and receive a textual breakdown of its structure and relationships. The fix feature automatically detects syntax or logical issues in PlantUML code and suggests corrections. Synchronization functionality helps ensure that diagrams remain consistent with the actual implementation by detecting changes in code or architecture and updating the visual model accordingly. Typical use cases involve software architects and development teams who rely on PlantUML for documenting system designs, microservices architectures, or class hierarchies. The workflow often begins with a textual description or an existing diagram, followed by AI assisted refinement and validation. Teams can then connect the platform to their development environment or CI/CD pipeline via MCP, enabling automated diagram updates when code changes are committed. This integration supports continuous documentation and reduces the manual effort required to keep diagrams current. Technical requirements include access to the StartWithUML cloud service, which processes PlantUML code and AI interactions. Users need a modern web browser and an internet connection. The platform supports standard PlantUML syntax and can interface with external AI coding agents that comply with the MCP specification. No local installation is required for the core functionality, though integration with local development tools may involve additional configuration.