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Add a client extension API (#3034)

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Max 2026-06-30 21:31:02 +01:00 • committed by GitHub
commit 4df609119f
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1 changed files with 3410 additions and 180 deletions
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10
tests/interaction/_connect.py
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@ -7,7 +7,7 @@ server's real Starlette app through the in-process streaming bridge, so the full
(session ids, SSE encoding, session management) runs with no sockets, threads, or subprocesses.
"""
from collections.abc import AsyncIterator, Awaitable, Callable, Iterable
from collections.abc import AsyncIterator, Awaitable, Callable, Iterable, Sequence
from contextlib import AbstractAsyncContextManager, asynccontextmanager
from functools import partial
from typing import Any, Protocol
@ -30,6 +30,7 @@ from starlette.responses import Response
from starlette.routing import Mount, Route
from mcp.client.client import Client
from mcp.client.extension import ClientExtension
from mcp.client.session import ElicitationFnT, ListRootsFnT, LoggingFnT, MessageHandlerFnT, SamplingFnT
from mcp.client.sse import sse_client
from mcp.client.streamable_http import streamable_http_client
@ -70,6 +71,7 @@ class Connect(Protocol):
message_handler: MessageHandlerFnT | None = None,
client_info: Implementation | None = None,
elicitation_callback: ElicitationFnT | None = None,
extensions: Sequence[ClientExtension] | None = None,
spec_version: str = LATEST_HANDSHAKE_VERSION,
) -> AbstractAsyncContextManager[Client]: ...
@ -85,6 +87,7 @@ async def connect_in_memory(
message_handler: MessageHandlerFnT | None = None,
client_info: Implementation | None = None,
elicitation_callback: ElicitationFnT | None = None,
extensions: Sequence[ClientExtension] | None = None,
spec_version: str = LATEST_HANDSHAKE_VERSION,
) -> AsyncIterator[Client]:
"""Yield a Client connected to the server over the in-memory transport.
@ -103,6 +106,7 @@ async def connect_in_memory(
message_handler=message_handler,
client_info=client_info,
elicitation_callback=elicitation_callback,
extensions=extensions,
) as client:
yield client
@ -122,6 +126,7 @@ async def connect_over_streamable_http(
message_handler: MessageHandlerFnT | None = None,
client_info: Implementation | None = None,
elicitation_callback: ElicitationFnT | None = None,
extensions: Sequence[ClientExtension] | None = None,
spec_version: str = LATEST_HANDSHAKE_VERSION,
) -> AsyncIterator[Client]:
"""Yield a Client connected to the server's streamable HTTP app, entirely in process.
@ -156,6 +161,7 @@ async def connect_over_streamable_http(
message_handler=message_handler,
client_info=client_info,
elicitation_callback=elicitation_callback,
extensions=extensions,
) as client,
):
yield client
@ -357,6 +363,7 @@ async def connect_over_sse(
message_handler: MessageHandlerFnT | None = None,
client_info: Implementation | None = None,
elicitation_callback: ElicitationFnT | None = None,
extensions: Sequence[ClientExtension] | None = None,
spec_version: str = LATEST_HANDSHAKE_VERSION,
) -> AsyncIterator[Client]:
"""Yield a Client connected to the server's legacy SSE transport, entirely in process."""
@ -390,5 +397,6 @@ async def connect_over_sse(
message_handler=message_handler,
client_info=client_info,
elicitation_callback=elicitation_callback,
extensions=extensions,
) as client:
yield client