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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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tests/server/test_tool_annotations.py
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@ -229,7 +229,7 @@ async def test_task_execution_auto_populated_for_task_enabled_tool():
"""A tool that runs in background."""
return f"Processed: {data}"
async with Client(mcp) as client:
async with Client(mcp, mode="legacy") as client:
tools_result = await client.list_tools()
assert len(tools_result) == 1
assert tools_result[0].name == "background_tool"