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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/tools/tool_transform/test_tool_transform.py
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@ -736,7 +736,7 @@ class TestProxy:
)
proxy_server.add_tool(new_add_tool)
async with Client(proxy_server) as client:
async with Client(proxy_server, mode="legacy") as client:
# The tool should be registered with its transformed name
result = await client.call_tool("add_transformed", {"new_x": 1, "old_y": 2})
assert isinstance(result.content[0], TextContent)