change default MCPClient transport to streamable-http #1618
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### Summary This PR updates the default behavior of `MCPClient` to use the `streamable-http` transport instead of the deprecated `sse` protocol when no `transport` is explicitly provided in `server_parameters`. ### Changes - Default transport is now `"streamable-http"` if not specified. - Updated warning message accordingly. - Reflects change introduced in version 1.20.0 of `mcp`. ### Why? As of v1.20.0, the `"sse"` transport is deprecated. This change aligns the default behavior with the new recommended standard and avoids future breakage.
Adds a unit test to validate that MCPClient uses 'streamable-http' as the default transport when no 'transport' key is explicitly provided in the server_parameters dict. This ensures the new default (introduced in v1.20) is enforced and helps prevent future regressions. Also checks that a FutureWarning is properly issued to guide users toward explicit usage.
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Summary
This PR updates the default behavior of
MCPClientto use thestreamable-httptransport instead of the deprecatedsseprotocol when notransportis explicitly provided inserver_parameters.Changes
"streamable-http"if not specified.mcp.Why?
As of v1.20.0, the
"sse"transport is deprecated. This change aligns the default behavior with the new recommended standard and avoids future breakage.