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Merge pull request #190 from koic/avoid_draft_protocol_version

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Default to the latest stable protocol version
This commit is contained in:
Koichi ITO 2025-12-20 18:55:18 +09:00 • committed by GitHub
commit baeb75c8d8
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5 changed files with 13 additions and 13 deletions
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3
README.md
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@ -349,7 +349,8 @@ configuration = MCP::Configuration.new(protocol_version: "2024-11-05")
MCP::Server.new(name: "test_server", configuration: configuration) MCP::Server.new(name: "test_server", configuration: configuration)
``` ```
If no protocol version is specified, the [Draft version](https://modelcontextprotocol.io/specification/draft) will be applied by default. If no protocol version is specified, the latest stable version will be applied by default.
The latest stable version includes new features from the [draft version](https://modelcontextprotocol.io/specification/draft).
This will make all new server instances use the specified protocol version instead of the default version. The protocol version can be reset to the default by setting it to `nil`: This will make all new server instances use the specified protocol version instead of the default version. The protocol version can be reset to the default by setting it to `nil`:

8
lib/mcp/configuration.rb
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@ -2,10 +2,8 @@
module MCP module MCP
class Configuration class Configuration
# DRAFT-2025-v3 is the latest draft protocol version: LATEST_STABLE_PROTOCOL_VERSION = "2025-06-18"
# https://github.com/modelcontextprotocol/modelcontextprotocol/blob/14ec41c/schema/draft/schema.ts#L15 SUPPORTED_STABLE_PROTOCOL_VERSIONS = [LATEST_STABLE_PROTOCOL_VERSION, "2025-03-26", "2024-11-05"]
DRAFT_PROTOCOL_VERSION = "DRAFT-2025-v3"
SUPPORTED_STABLE_PROTOCOL_VERSIONS = ["2025-06-18", "2025-03-26", "2024-11-05"]
attr_writer :exception_reporter, :instrumentation_callback attr_writer :exception_reporter, :instrumentation_callback
@ -35,7 +33,7 @@ module MCP
end end
def protocol_version def protocol_version
@protocol_version || DRAFT_PROTOCOL_VERSION @protocol_version || LATEST_STABLE_PROTOCOL_VERSION
end end
def protocol_version? def protocol_version?

9
test/mcp/configuration_test.rb
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@ -38,18 +38,19 @@ module MCP
# https://github.com/modelcontextprotocol/modelcontextprotocol/blob/14ec41c/schema/draft/schema.ts#L15 # https://github.com/modelcontextprotocol/modelcontextprotocol/blob/14ec41c/schema/draft/schema.ts#L15
test "initializes with default protocol version" do test "initializes with default protocol version" do
config = Configuration.new config = Configuration.new
assert_equal Configuration::DRAFT_PROTOCOL_VERSION, config.protocol_version assert_equal Configuration::LATEST_STABLE_PROTOCOL_VERSION, config.protocol_version
end end
test "uses the draft protocol version when protocol_version is set to nil" do test "uses the draft protocol version when protocol_version is set to nil" do
config = Configuration.new(protocol_version: nil) config = Configuration.new(protocol_version: nil)
assert_equal Configuration::DRAFT_PROTOCOL_VERSION, config.protocol_version assert_equal Configuration::LATEST_STABLE_PROTOCOL_VERSION, config.protocol_version
end end
test "raises ArgumentError when setting the draft protocol version" do test "raises ArgumentError when setting the draft protocol version" do
exception = assert_raises(ArgumentError) do exception = assert_raises(ArgumentError) do
# To use the draft version externally, either omit `protocol_version` or set it to nil. # DRAFT-2025-v3 is the latest draft protocol version:
Configuration.new(protocol_version: Configuration::DRAFT_PROTOCOL_VERSION) # https://github.com/modelcontextprotocol/modelcontextprotocol/blob/14ec41c/schema/draft/schema.ts#L15
Configuration.new(protocol_version: "DRAFT-2025-v3")
end end
assert_equal("protocol_version must be 2025-06-18, 2025-03-26, or 2024-11-05", exception.message) assert_equal("protocol_version must be 2025-06-18, 2025-03-26, or 2024-11-05", exception.message)

2
test/mcp/server/transports/streamable_http_transport_test.rb
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@ -81,7 +81,7 @@ module MCP
body = JSON.parse(response[2][0]) body = JSON.parse(response[2][0])
assert_equal "2.0", body["jsonrpc"] assert_equal "2.0", body["jsonrpc"]
assert_equal "123", body["id"] assert_equal "123", body["id"]
assert_equal Configuration::DRAFT_PROTOCOL_VERSION, body["result"]["protocolVersion"] assert_equal Configuration::LATEST_STABLE_PROTOCOL_VERSION, body["result"]["protocolVersion"]
end end
test "handles GET request with valid session ID" do test "handles GET request with valid session ID" do

4
test/mcp/server_test.rb
View file

@ -133,7 +133,7 @@ module MCP
jsonrpc: "2.0", jsonrpc: "2.0",
id: 1, id: 1,
result: { result: {
protocolVersion: Configuration::DRAFT_PROTOCOL_VERSION, protocolVersion: Configuration::LATEST_STABLE_PROTOCOL_VERSION,
capabilities: { capabilities: {
prompts: { listChanged: true }, prompts: { listChanged: true },
resources: { listChanged: true }, resources: { listChanged: true },
@ -776,7 +776,7 @@ module MCP
} }
response = @server.handle(request) response = @server.handle(request)
assert_equal Configuration::DRAFT_PROTOCOL_VERSION, response[:result][:protocolVersion] assert_equal Configuration::LATEST_STABLE_PROTOCOL_VERSION, response[:result][:protocolVersion]
end end
test "server response does not include title when not configured" do test "server response does not include title when not configured" do