QA: Multimodal Attachments — Claude Agent SDK (Python)

Prerequisites

• Demo is deployed and accessible
• Agent backend is healthy (check /api/health)
• ANTHROPIC_API_KEY is set on the deployment
• pypdf is installed in the backend environment (listed in requirements.txt)

Test Steps

1. Basic Functionality

• Navigate to /demos/multimodal
• Verify the "Multimodal attachments" header renders
• Verify the bundled-samples row shows "Try with sample image" and "Try with sample PDF" buttons
• Verify the paperclip button is visible on the chat composer

2. Feature-Specific Checks

Sample image

• Click "Try with sample image" — the button should flip to "Loading…" briefly
• Verify the CopilotChat attachment strip shows a pending sample.png chip
• Type "What's in this image?" and send
• Verify Claude's reply references concrete visual details (e.g. colors, objects) from the bundled PNG

Sample PDF

• Click "Try with sample PDF"
• Verify the sample.pdf chip appears
• Type "Summarise this document" and send
• Verify Claude replies with a short summary of the PDF's actual content (not a generic "I cannot read PDFs" reply)

3. LFS-pointer guard

• If the deployment accidentally ships a Git LFS pointer instead of the real binary, clicking a sample button should surface data-testid="multimodal-sample-error" with an actionable message

4. Error Handling

• No console errors during normal usage.
• Upload a file over 10 MB and verify the attachment is rejected with a visible toast.

Expected Results

• Image replies reference real visual details (not generic).
• PDF replies reference document-specific content.
• No silent dropping of attachments.