## ✅ Cross-SDK Consistency Review

[annadonnawalters-cpu]

✅ Cross-SDK Consistency Review

I've reviewed PR #731 for cross-SDK consistency across all four language implementations (Node.js/TypeScript, Python, Go, and .NET).

Summary: Excellent consistency maintained ✨

This PR successfully adds the blob attachment type to all four SDKs with proper feature parity:

Type Definitions ✅

• Node.js/TypeScript: Manual type added to MessageOptions.attachments union in nodejs/src/types.ts + generated types updated
• Python: BlobAttachment TypedDict added to python/copilot/types.py and properly exported in __init__.py + generated types updated
• Go: Uses generated Attachment struct from generated_session_events.go with Blob AttachmentType constant
• .NET: UserMessageDataAttachmentsItemBlob class generated in dotnet/src/Generated/SessionEvents.cs

API Consistency ✅

All SDKs expose the same three required/optional fields with appropriate naming conventions:

Field	Node/Python	Go	.NET	Required
data	data	Data	Data	✅
mimeType	mimeType	MIMEType	MimeType	✅
displayName	displayName	DisplayName	DisplayName	Optional

Documentation ✅

• Comprehensive examples added to all four language READMEs
• Detailed feature documentation in docs/features/image-input.md with side-by-side examples
• Updated docs/features/streaming-events.md to mention blob attachments
• Test scenario documentation updated in test/scenarios/prompts/attachments/README.md

No consistency issues found 🎉

The implementation properly accounts for language idioms (camelCase in TS/Python dict keys, PascalCase in Go/C# public APIs) while maintaining semantic equivalence across all SDKs.

Generated by SDK Consistency Review Agent for issue #731 · ◷

Originally posted by @github-actions[bot] in #731 (comment)