Add HTTP Streamable support for MCP's

[dougbarrett]

Please read this first

• Have you read the docs?Agents SDK docs - Yes
• Have you searched for related issues? Others may have had similar requests - Yes

Describe the feature

MCP is moving towards using HTTP Streamable vs HTTP+SSE. There is a guide on how to ensure backwards compatibility:

https://modelcontextprotocol.io/specification/2025-03-26/basic/transports#backwards-compatibility

Hopefully this is something someone would be willing to take on as I'm running into a lot more HTTP streamable api's available which is a non-starter for me.

[rm-openai]

Yeah totally, will be doing this as soon as streamable support lands in the mcp python sdk (which it hasn't yet, afaict)

[dougbarrett]

Thank you! Appreciate the fast response here - hopefully this is the work you're referring to that needs to be merged? modelcontextprotocol/python-sdk#573

[rm-openai]

Yup!

[Akshit97]

@rm-openai Added implementation for Streamable HTTP client. Will make this PR ready once the MCP python-sdk changes are released.
#643

[fmtsvetkov]

@rm-openai @Akshit97 FYI the Streamable HTTP was released recently
https://github.com/modelcontextprotocol/python-sdk/releases/tag/v1.8.0

[Akshit97]

@fmtsvetkov I have done the changes, just waiting for the PR to be reviewed and merged.
#643