reflect: Elem of invalid type mcp.Result

[zhaohuabing]

Describe the bug

Call

ClientSession.Complete(m.T().Context(), &mcp.CompleteParams{
		Argument: mcp.CompleteParamsArgument{
			Name:  "language",
			Value: "py",
		},
		Ref: &mcp.CompleteReference{
			Type: "ref/prompt",
			Name: "code_review",
		},
	})

Got this error

     reflect: Elem of invalid type mcp.Result
            goroutine 114 [running]:
            runtime/debug.Stack()
            	/home/linuxbrew/.linuxbrew/Cellar/go/1.25.0/libexec/src/runtime/debug/stack.go:26 +0x5e
            github.com/stretchr/testify/suite.failOnPanic(0xc000702380, {0x131bfa0, 0xc00071a620})
            	/home/ubuntu/go/pkg/mod/github.com/stretchr/testify@v1.11.0/suite/suite.go:89 +0x37
            github.com/stretchr/testify/suite.Run.func1.1()
            	/home/ubuntu/go/pkg/mod/github.com/stretchr/testify@v1.11.0/suite/suite.go:184 +0x25f
            panic({0x131bfa0?, 0xc00071a620?})
            	/home/linuxbrew/.linuxbrew/Cellar/go/1.25.0/libexec/src/runtime/panic.go:783 +0x132
            reflect.elem(0x1?)
            	/home/linuxbrew/.linuxbrew/Cellar/go/1.25.0/libexec/src/reflect/type.go:742 +0x9a
            reflect.(*rtype).Elem(0xc0003691d8?)
            	/home/linuxbrew/.linuxbrew/Cellar/go/1.25.0/libexec/src/reflect/type.go:746 +0x15
            github.com/modelcontextprotocol/go-sdk/mcp.newServerMethodInfo[...].func4()
            	/home/ubuntu/mcp-go-sdk/mcp/shared.go:296 +0x2e
            github.com/modelcontextprotocol/go-sdk/mcp.defaultSendingMethodHandler[...]({0x18550d0?, 0xc000618000}, {0x16497f3, 0x13}, {0x1855990, 0xc000518390})
            	/home/ubuntu/mcp-go-sdk/mcp/shared.go:101 +0x1c2
            github.com/modelcontextprotocol/go-sdk/mcp.handleSend[...]({0x18550d0, 0xc000618000}, {0x16497f3, 0x13}, {0x1855990, 0xc000518390})
            	/home/ubuntu/mcp-go-sdk/mcp/shared.go:126 +0x71
            github.com/modelcontextprotocol/go-sdk/mcp.(*ClientSession).Complete(0xc00033c1c0, {0x18550d0, 0xc000618000}, 0xc0007126c0?)
            	/home/ubuntu/mcp-go-sdk/mcp/client.go:601 +0xcc

To Reproduce
Steps to reproduce the behavior:

1. call ClientSession.Complete

Expected behavior
I should be able to call ClientSession.Complete