[MCP Apps] Send follow up message

[martinalong]

Motivation and Context

Adds support for sendFollowUpMessage, which allows apps to send a follow up prompt from a widget.

How Has This Been Tested?

Yes, manually tested

Breaking Changes

No

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

Additional context

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/ext-apps@193

commit: 74ea3b2

[idosal]

Hey @martinalong, please note that ui/message already implements this functionality in the spec.

[martinalong]

Oh perfect ok! will close this then. Didn't realize we already had it

[idosal]

Oh perfect ok! will close this then. Didn't realize we already had it

Thanks @martinalong ! 🙏