Bump protocol version to nov 25 (#308)

CHANGELOG.md

@@ -5,6 +5,7 @@ All notable changes to `mcp/sdk` will be documented in this file.
 0.6.0
 -----
 
+* [BC Break] Bump default protocol version to `2025-11-25`
 * Allow overriding the default name pattern for Discovery
 * Add configurable session garbage collection (`gcProbability`/`gcDivisor`)
 

src/Client/Builder.php

@@ -153,7 +153,7 @@ final class Builder
         $config = new Configuration(
             clientInfo: $clientInfo,
             capabilities: $this->capabilities ?? new ClientCapabilities(),
-            protocolVersion: $this->protocolVersion ?? ProtocolVersion::V2025_06_18,
+            protocolVersion: $this->protocolVersion ?? ProtocolVersion::V2025_11_25,
             initTimeout: $this->initTimeout,
             requestTimeout: $this->requestTimeout,
             maxRetries: $this->maxRetries,

src/Client/Configuration.php

@@ -25,7 +25,7 @@ class Configuration
     public function __construct(
         public readonly Implementation $clientInfo,
         public readonly ClientCapabilities $capabilities,
-        public readonly ProtocolVersion $protocolVersion = ProtocolVersion::V2025_06_18,
+        public readonly ProtocolVersion $protocolVersion = ProtocolVersion::V2025_11_25,
         public readonly int $initTimeout = 30,
         public readonly int $requestTimeout = 120,
         public readonly int $maxRetries = 3,

src/Schema/JsonRpc/MessageInterface.php

@@ -21,5 +21,5 @@ use Mcp\Schema\Enum\ProtocolVersion;
 interface MessageInterface extends \JsonSerializable
 {
     public const JSONRPC_VERSION = '2.0';
-    public const PROTOCOL_VERSION = ProtocolVersion::V2025_06_18;
+    public const PROTOCOL_VERSION = ProtocolVersion::V2025_11_25;
 }