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Merged
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Jul 21, 2025
Merged

Set default protocol version to the latest specification #83

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4 changes: 2 additions & 2 deletions README.md
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Expand Up @@ -148,7 +148,7 @@ server.notify_tools_list_changed()
#### Rails Controller

When added to a Rails controller on a route that handles POST requests, your server will be compliant with non-streaming
[Streamable HTTP](https://modelcontextprotocol.io/specification/2025-03-26/basic/transports#streamable-http) transport
[Streamable HTTP](https://modelcontextprotocol.io/specification/2025-06-18/basic/transports#streamable-http) transport
requests.

You can use the `Server#handle_json` method to handle requests.
Expand Down Expand Up @@ -340,7 +340,7 @@ MCP::Server.protocol_version = nil

If an invalid `protocol_version` value is set, an `ArgumentError` is raised.

Be sure to check the [MCP spec](https://modelcontextprotocol.io/specification/2025-03-26) for the protocol version to understand the supported features for the version being set.
Be sure to check the [MCP spec](https://modelcontextprotocol.io/specification) for the protocol version to understand the supported features for the version being set.

### Exception Reporting

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4 changes: 2 additions & 2 deletions lib/mcp/configuration.rb
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Expand Up @@ -2,8 +2,8 @@

module MCP
class Configuration
DEFAULT_PROTOCOL_VERSION = "2024-11-05"
SUPPORTED_PROTOCOL_VERSIONS = ["2025-06-18", "2025-03-26", DEFAULT_PROTOCOL_VERSION]
DEFAULT_PROTOCOL_VERSION = "2025-06-18"
SUPPORTED_PROTOCOL_VERSIONS = [DEFAULT_PROTOCOL_VERSION, "2025-03-26", "2024-11-05"]

attr_writer :exception_reporter, :instrumentation_callback, :protocol_version, :validate_tool_call_arguments

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2 changes: 1 addition & 1 deletion test/mcp/server/transports/streamable_http_transport_test.rb
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Expand Up @@ -84,7 +84,7 @@ class StreamableHTTPTransportTest < ActiveSupport::TestCase
body = JSON.parse(response[2][0])
assert_equal "2.0", body["jsonrpc"]
assert_equal "123", body["id"]
assert_equal "2024-11-05", body["result"]["protocolVersion"]
assert_equal "2025-06-18", body["result"]["protocolVersion"]
end

test "handles GET request with valid session ID" do
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2 changes: 1 addition & 1 deletion test/mcp/server_test.rb
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Expand Up @@ -114,7 +114,7 @@ class ServerTest < ActiveSupport::TestCase
jsonrpc: "2.0",
id: 1,
result: {
protocolVersion: "2024-11-05",
protocolVersion: "2025-06-18",
capabilities: {
prompts: { listChanged: true },
resources: { listChanged: true },
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