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Add support for the optional description parameter in serverInfo

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This PR adds support for the optional `description` parameter in `serverInfo`.
This parameter has been supported since the 2025-11-25 MCP specification.
https://modelcontextprotocol.io/specification/2025-11-25/schema#implementation
This commit is contained in:
Koichi ITO 2025-12-20 15:01:51 +09:00
commit 851974e454
2 changed files with 28 additions and 1 deletions
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12
lib/mcp/server.rb
View file

@ -31,9 +31,10 @@ module MCP
include Instrumentation
attr_accessor :name, :title, :version, :instructions, :tools, :prompts, :resources, :server_context, :configuration, :capabilities, :transport
attr_accessor :description, :name, :title, :version, :instructions, :tools, :prompts, :resources, :server_context, :configuration, :capabilities, :transport
def initialize(
description: nil,
name: "model_context_protocol",
title: nil,
version: DEFAULT_VERSION,
@ -47,6 +48,7 @@ module MCP
capabilities: nil,
transport: nil
)
@description = description
@name = name
@title = title
@version = version
@ -175,6 +177,13 @@ module MCP
def validate!
# NOTE: The draft protocol version is the next version after 2025-11-25.
if @configuration.protocol_version <= "2025-06-18"
if server_info.key?(:description)
message = "Error occurred in server_info. `description` is not supported in protocol version 2025-06-18 or earlier"
raise ArgumentError, message
end
end
if @configuration.protocol_version <= "2025-03-26"
if server_info.key?(:title)
message = "Error occurred in server_info. `title` is not supported in protocol version 2025-03-26 or earlier"
@ -255,6 +264,7 @@ module MCP
def server_info
@server_info ||= {
description:,
name:,
title:,
version:,

17
test/mcp/server_test.rb
View file

@ -68,6 +68,7 @@ module MCP
configuration.instrumentation_callback = instrumentation_helper.callback
@server = Server.new(
description: "Test server",
name: @server_name,
title: "Example Server Display Name",
version: "1.2.3",
@ -140,6 +141,7 @@ module MCP
tools: { listChanged: true },
},
serverInfo: {
description: "Test server",
name: @server_name,
title: "Example Server Display Name",
version: "1.2.3",
@ -815,6 +817,21 @@ module MCP
refute response[:result].key?(:instructions)
end
test "server uses description when configured with protocol version 2025-11-25" do
configuration = Configuration.new(protocol_version: "2025-11-25")
server = Server.new(description: "This is the MCP server used during tests.", name: "test_server", configuration: configuration)
assert_equal("This is the MCP server used during tests.", server.description)
end
test "raises error if description is used with protocol version 2025-06-18" do
configuration = Configuration.new(protocol_version: "2025-06-18")
exception = assert_raises(ArgumentError) do
Server.new(description: "This is the MCP server used during tests.", name: "test_server", configuration: configuration)
end
assert_equal("Error occurred in server_info. `description` is not supported in protocol version 2025-06-18 or earlier", exception.message)
end
test "server uses instructions when configured with protocol version 2025-03-26" do
configuration = Configuration.new(protocol_version: "2025-03-26")
server = Server.new(name: "test_server", instructions: "The server instructions.", configuration: configuration)