Continue making instructions optional. (#107)

Author: domesticmouse

pkgs/dart_mcp/CHANGELOG.md

@@ -32,8 +32,10 @@
   which has all supported versions and whether or not they are supported.
 - **Breaking**: Change `InitializeRequest` and `InitializeResult` to take a
   `ProtocolVersion` instead of a string.
-- **Breaking**: Change the `InitializeResult`'s `instructions` to `String?` to reflect
-  that not all servers return instructions.
+- **Breaking**: Change the `InitializeResult`'s `instructions` to `String?` to
+  reflect that not all servers return instructions.
+- Change the `MCPServer.fromStreamChannel` constructor to make the `instructions`
+  parameter optional.
 - **Breaking**: Change `MCPBase` to accept a `StreamChannel<String>` instead of
   a `Peer`, and construct its own `Peer`.
 - **Breaking**: Add `protocolLogSink` optional parameter to connect methods on

pkgs/dart_mcp/lib/src/server/server.dart

@@ -36,7 +36,7 @@ abstract base class MCPServer extends MCPBase {
   /// Instructions for how to use this server, which are given to the client.
   ///
   /// These may be used in system prompts.
-  final String instructions;
+  final String? instructions;
 
   /// The negotiated protocol version.
   ///
@@ -62,7 +62,7 @@ abstract base class MCPServer extends MCPBase {
   MCPServer.fromStreamChannel(
     super.channel, {
     required this.implementation,
-    required this.instructions,
+    this.instructions,
     super.protocolLogSink,
   }) {
     registerRequestHandler(InitializeRequest.methodName, initialize);