# Specs - Design This command documents technical architecture, sequence diagrams, and implementation considerations. It's a great place to capture the big picture of how the system will work, including the components and their interactions. ## Usage To create a new design, just type: ``` /spec:design ``` ## What This Command Does 1. Checks if the folder with a filepath-safe version of already exists under `.specs` and has a `requirements.md` file. If not, it stops and asks the user to create the requirements first with `/spec:req `. 2. Checks if a file named `design.md` exists in the folder, if not it creates one. 3. Based on the requirements defined in `requirements.md`, it generates a preliminary design document in `design.md` with appropriate format. ## Appropriate Format ```md # Design Document One or two short paragraphs to describe what the design implements. Example: ``` This design implements Google Sign In as an additional authentication method for the existing Next.js application. The solution integrates Google as an identity provider with Amazon Cognito, leveraging the existing AWS Amplify authentication flow while adding a new UI option for users to authenticate with their Google accounts. The design maintains the current authentication architecture and user management system, extending it to support federated identity through Google OAuth 2.0. ``` ## Architecture ### High-Level Flow Describe the flow at a high level. Example: ``` 1. **User Interface**: Enhanced sign-in page with both Cognito and Google authentication options 2. **Identity Provider**: Google OAuth 2.0 configured as a federated identity provider in Cognito 3. **Authentication Flow**: AWS Amplify handles OAuth flow with Google through Cognito 4. **User Management**: Existing user creation and session management remains unchanged ``` ### Component Interaction Create a mermaid diagram to illustrate the interaction between components. ## Components and Interfaces ### 1. Infrastructure Changes Describe any infrastructure changes needed, such as new AWS resources or modifications to existing ones. Omit if not applicable. ### 2. Frontend UI Changes Describe any changes to the frontend user interface, such as new components, modified layouts, or updated styles. Omit if not applicable. ### 3. Authentication Configuration Describe any changes to the authentication configuration, such as new identity providers, modified authentication flows, or updated security settings. Omit if not applicable. ### 4. API Changes Describe any changes to the backend APIs, such as new endpoints, modified request/response formats, or updated security settings. Omit if not applicable. ### 5. Database Changes Describe any changes to the database schema, such as new tables, modified columns, or updated relationships. Omit if not applicable. ### 6. Environment Variables Describe any changes to the environment variables, such as new variables, modified values, or updated configurations. Omit if not applicable. ## Data Models Create a section for each data model affected by the design. Include the model name, a description of its purpose, and any relevant fields or relationships. ## Error Handling Describe how errors will be handled in the system, including any new error types, error messages, or error handling flows. Omit if not applicable. ## Unit Testing Strategy Describe the approach to unit testing for the new design, including any new test cases, testing frameworks, or testing strategies. We always strive to have 100% test coverage. Omit if not applicable. ## Other Considerations Create separate sections for any additional considerations that may impact the design, such as performance optimizations, security implications, or compliance requirements. ```