Composer Multi-Step Prompt

I need to implement {{feature_name}}.

Here's the plan — execute each step in order:

Step 1: Create the data model / types in {{types_location}}
Step 2: Build the API route at {{api_path}} with GET and POST handlers
Step 3: Create the UI component at {{component_path}}
Step 4: Wire up the component to the API with proper loading/error states
Step 5: Add form validation using {{validation_library}}

For each step:
- Follow existing patterns in the codebase (check similar files first)
- Use @{{reference_file}} as a reference for style and structure
- Do NOT modify any files outside the ones listed above

After all steps, list any environment variables or dependencies I need to add.