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Commit 13f0182

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ihrprihrpr
authored
Set 2025-03-26 as the latest protocol version (#719)
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‎src/mcp/shared/version.py

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+1-1Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,3 +1,3 @@
11
from mcp.types import LATEST_PROTOCOL_VERSION
22

3-
SUPPORTED_PROTOCOL_VERSIONS: tuple[int, str] = (1, LATEST_PROTOCOL_VERSION)
3+
SUPPORTED_PROTOCOL_VERSIONS: list[str] = ["2024-11-05", LATEST_PROTOCOL_VERSION]

‎src/mcp/types.py

Copy file name to clipboardExpand all lines: src/mcp/types.py
+1-1Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -29,7 +29,7 @@
2929
not separate types in the schema.
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"""
3131

32-
LATEST_PROTOCOL_VERSION = "2024-11-05"
32+
LATEST_PROTOCOL_VERSION = "2025-03-26"
3333

3434
ProgressToken = str | int
3535
Cursor = str

‎tests/client/test_session.py

Copy file name to clipboardExpand all lines: tests/client/test_session.py
+130Lines changed: 130 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -5,6 +5,7 @@
55
from mcp.client.session import DEFAULT_CLIENT_INFO, ClientSession
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from mcp.shared.message import SessionMessage
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from mcp.shared.session import RequestResponder
8+
from mcp.shared.version import SUPPORTED_PROTOCOL_VERSIONS
89
from mcp.types import (
910
LATEST_PROTOCOL_VERSION,
1011
ClientNotification,
@@ -250,3 +251,132 @@ async def mock_server():
250251

251252
# Assert that the default client info was sent
252253
assert received_client_info == DEFAULT_CLIENT_INFO
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256+
@pytest.mark.anyio
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async def test_client_session_version_negotiation_success():
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"""Test successful version negotiation with supported version"""
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client_to_server_send, client_to_server_receive = anyio.create_memory_object_stream[
260+
SessionMessage
261+
](1)
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server_to_client_send, server_to_client_receive = anyio.create_memory_object_stream[
263+
SessionMessage
264+
](1)
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async def mock_server():
267+
session_message = await client_to_server_receive.receive()
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jsonrpc_request = session_message.message
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assert isinstance(jsonrpc_request.root, JSONRPCRequest)
270+
request = ClientRequest.model_validate(
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jsonrpc_request.model_dump(by_alias=True, mode="json", exclude_none=True)
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)
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assert isinstance(request.root, InitializeRequest)
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# Verify client sent the latest protocol version
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assert request.root.params.protocolVersion == LATEST_PROTOCOL_VERSION
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# Server responds with a supported older version
279+
result = ServerResult(
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InitializeResult(
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protocolVersion="2024-11-05",
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capabilities=ServerCapabilities(),
283+
serverInfo=Implementation(name="mock-server", version="0.1.0"),
284+
)
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)
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async with server_to_client_send:
288+
await server_to_client_send.send(
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SessionMessage(
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JSONRPCMessage(
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JSONRPCResponse(
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jsonrpc="2.0",
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id=jsonrpc_request.root.id,
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result=result.model_dump(
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by_alias=True, mode="json", exclude_none=True
296+
),
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)
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)
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)
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)
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# Receive initialized notification
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await client_to_server_receive.receive()
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async with (
305+
ClientSession(
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server_to_client_receive,
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client_to_server_send,
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) as session,
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anyio.create_task_group() as tg,
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client_to_server_send,
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client_to_server_receive,
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server_to_client_send,
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server_to_client_receive,
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):
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tg.start_soon(mock_server)
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result = await session.initialize()
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# Assert the result with negotiated version
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assert isinstance(result, InitializeResult)
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assert result.protocolVersion == "2024-11-05"
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assert result.protocolVersion in SUPPORTED_PROTOCOL_VERSIONS
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@pytest.mark.anyio
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async def test_client_session_version_negotiation_failure():
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"""Test version negotiation failure with unsupported version"""
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client_to_server_send, client_to_server_receive = anyio.create_memory_object_stream[
328+
SessionMessage
329+
](1)
330+
server_to_client_send, server_to_client_receive = anyio.create_memory_object_stream[
331+
SessionMessage
332+
](1)
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async def mock_server():
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session_message = await client_to_server_receive.receive()
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jsonrpc_request = session_message.message
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assert isinstance(jsonrpc_request.root, JSONRPCRequest)
338+
request = ClientRequest.model_validate(
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jsonrpc_request.model_dump(by_alias=True, mode="json", exclude_none=True)
340+
)
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assert isinstance(request.root, InitializeRequest)
342+
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# Server responds with an unsupported version
344+
result = ServerResult(
345+
InitializeResult(
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protocolVersion="2020-01-01", # Unsupported old version
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capabilities=ServerCapabilities(),
348+
serverInfo=Implementation(name="mock-server", version="0.1.0"),
349+
)
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)
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async with server_to_client_send:
353+
await server_to_client_send.send(
354+
SessionMessage(
355+
JSONRPCMessage(
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JSONRPCResponse(
357+
jsonrpc="2.0",
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id=jsonrpc_request.root.id,
359+
result=result.model_dump(
360+
by_alias=True, mode="json", exclude_none=True
361+
),
362+
)
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)
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)
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)
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async with (
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ClientSession(
369+
server_to_client_receive,
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client_to_server_send,
371+
) as session,
372+
anyio.create_task_group() as tg,
373+
client_to_server_send,
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client_to_server_receive,
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server_to_client_send,
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server_to_client_receive,
377+
):
378+
tg.start_soon(mock_server)
379+
380+
# Should raise RuntimeError for unsupported version
381+
with pytest.raises(RuntimeError, match="Unsupported protocol version"):
382+
await session.initialize()

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