FastAPI streaming response

[wfcz10086]

Is the MCP server compatible with the original FastAPI streaming response pattern? If my FastAPI endpoints return streaming responses, will the MCP tools also maintain this streaming behavior when called by AI assistants?

[shahar4499]

We didn't test that, but my assumption is that currently no, it won't work.

The SSE Transport as it is in current MCP python SDK is not meant for token streaming, as much as it is just a design choice by the protocol creators to have JSON RPC messages ride on top of.

Actual "streamable" responses would be inherently supported when either:

• We implement Streamable HTTP support #61
• Or, the python-sdk would

But I believe we'd implement it first, right after we're done with #10 .

[Dzg0309]

• We implement Streamable HTTP support #61

Is there a specific implementation timeline for this? I really need this function. Thank you.