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Default fastmcp.Client to mode="auto"; surface extensions=/result_claims=

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Client negotiates the newest mutual protocol era by default (probe
server/discover, fall back to the initialize handshake). ProxyClient and the
inspect utility explicitly pin the handshake era so proxy forwarding and
server_info reads are unchanged. SSE and multi-server config transports are
legacy-only. extensions= and result_claims= (SEP-2133) are thin passthroughs
to the SDK session.
This commit is contained in:
Jeremiah Lowin 2026-07-19 21:22:49 -04:00
commit d2ac7ed3d2
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84 changed files with 1553 additions and 601 deletions
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10
tests/server/tasks/test_progress_dependency.py
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@ -16,7 +16,7 @@ async def test_progress_in_immediate_execution():
await progress.set_message("Testing")
return "done"
async with Client(mcp) as client:
async with Client(mcp, mode="legacy") as client:
result = await client.call_tool("test_tool", {})
from mcp_types import TextContent
@ -35,7 +35,7 @@ async def test_progress_in_background_task():
await progress.set_message("Step 1")
return "done"
async with Client(mcp) as client:
async with Client(mcp, mode="legacy") as client:
task = await client.call_tool("test_task", {}, task=True)
result = await task.result()
from mcp_types import TextContent
@ -55,7 +55,7 @@ async def test_progress_tracks_multiple_increments():
await progress.increment()
return "counted"
async with Client(mcp) as client:
async with Client(mcp, mode="legacy") as client:
result = await client.call_tool("count_to_ten", {})
from mcp_types import TextContent
@ -86,7 +86,7 @@ async def test_progress_status_message_in_background_task():
await progress.increment()
return "done"
async with Client(mcp) as client:
async with Client(mcp, mode="legacy") as client:
task = await client.call_tool("task_with_progress", {}, task=True)
# Wait for first step to start
@ -141,7 +141,7 @@ async def test_inmemory_progress_state():
"message": progress.message,
}
async with Client(mcp) as client:
async with Client(mcp, mode="legacy") as client:
result = await client.call_tool("test_tool", {})
from mcp_types import TextContent