[Feature Request]: BasicMCPClient Support streamablehttp

[JosephWuMTK]

Feature Description

Hi team,

I noticed that the MCP Python SDK now supports the new Streamable HTTP transport from protocol version 2025-03-26 (see release notes: https://github.com/modelcontextprotocol/python-sdk/releases/tag/v1.8.0). There are also relevant examples provided.

It would be great if BasicMCPClient could also support streamablehttp_client from mcp.client.streamable_http.
This feature would be very useful for our applications.

Reason

No response

Value of Feature

No response

[logan-markewich]

PRs certainly welcome. I can look into it eventually

[ayowu1981]

Hi! Just a suggestion for improving the design of _run_session() in BasicMCPClient.

Currently, the transport type is inferred from command_or_url (e.g., checking if the scheme is "http"/"https"), which makes it harder to support additional transport types like streamable_http.

Consider making the transport type explicit—e.g., passing a transport: Literal["stdio", "sse", "streamable_http"] argument—and dispatching via a transport handler registry or factory function. This would improve clarity, modularity, and future extensibility.

[logan-markewich]

This has been added, fyi (and the connection type checking has also been greatly improved)

Feel free to open another PR if the current iteration is not enough @ayowu1981

llama_index/llama-index-integrations/tools/llama-index-tools-mcp/llama_index/tools/mcp/client.py

Line 63 in f11fbc2

class BasicMCPClient(ClientSession):