feat: add getters for server/client capabilities and implementation info

Add getter methods to expose server and client capabilities and implementation
information in both McpAsyncServer and McpSyncServer classes. Store client
metadata received during initialization for later retrieval.

Author: tzolov

mcp/src/main/java/org/springframework/ai/mcp/server/McpAsyncServer.java

@@ -38,6 +38,7 @@
 import org.springframework.ai.mcp.spec.McpError;
 import org.springframework.ai.mcp.spec.McpSchema;
 import org.springframework.ai.mcp.spec.McpSchema.CallToolResult;
+import org.springframework.ai.mcp.spec.McpSchema.ClientCapabilities;
 import org.springframework.ai.mcp.spec.McpSchema.LoggingLevel;
 import org.springframework.ai.mcp.spec.McpSchema.LoggingMessageNotification;
 import org.springframework.ai.mcp.spec.McpSchema.Tool;
@@ -66,6 +67,10 @@ public class McpAsyncServer {
 
 	private final McpSchema.Implementation serverInfo;
 
+	private McpSchema.ClientCapabilities clientCapabilities;
+
+	private McpSchema.Implementation clientInfo;
+
 	/**
 	 * Thread-safe list of tool handlers that can be modified at runtime.
 	 */
@@ -165,6 +170,9 @@ private DefaultMcpSession.RequestHandler initializeRequestHandler() {
 					new TypeReference<McpSchema.InitializeRequest>() {
 					});
 
+			this.clientCapabilities = initializeRequest.capabilities();
+			this.clientInfo = initializeRequest.clientInfo();
+
 			logger.info("Client initialize request - Protocol: {}, Capabilities: {}, Info: {}",
 					initializeRequest.protocolVersion(), initializeRequest.capabilities(),
 					initializeRequest.clientInfo());
@@ -183,6 +191,38 @@ private DefaultMcpSession.RequestHandler initializeRequestHandler() {
 		};
 	}
 
+	/**
+	 * Get the server capabilities that define the supported features and functionality.
+	 * @return The server capabilities
+	 */
+	public McpSchema.ServerCapabilities getServerCapabilities() {
+		return this.serverCapabilities;
+	}
+
+	/**
+	 * Get the server implementation information.
+	 * @return The server implementation details
+	 */
+	public McpSchema.Implementation getServerInfo() {
+		return this.serverInfo;
+	}
+
+	/**
+	 * Get the client capabilities that define the supported features and functionality.
+	 * @return The client capabilities
+	 */
+	public ClientCapabilities getClientCapabilities() {
+		return this.clientCapabilities;
+	}
+
+	/**
+	 * Get the client implementation information.
+	 * @return The client implementation details
+	 */
+	public McpSchema.Implementation getClientInfo() {
+		return this.clientInfo;
+	}
+
 	/**
 	 * Gracefully closes the server, allowing any in-progress operations to complete.
 	 * @return A Mono that completes when the server has been closed

mcp/src/main/java/org/springframework/ai/mcp/server/McpSyncServer.java

@@ -16,11 +16,11 @@
 
 package org.springframework.ai.mcp.server;
 
-import reactor.core.publisher.Mono;
-
 import org.springframework.ai.mcp.server.McpServer.PromptRegistration;
 import org.springframework.ai.mcp.server.McpServer.ResourceRegistration;
 import org.springframework.ai.mcp.server.McpServer.ToolRegistration;
+import org.springframework.ai.mcp.spec.McpSchema;
+import org.springframework.ai.mcp.spec.McpSchema.ClientCapabilities;
 import org.springframework.ai.mcp.spec.McpSchema.LoggingMessageNotification;
 import org.springframework.ai.mcp.util.Assert;
 
@@ -124,6 +124,38 @@ public void loggingNotification(LoggingMessageNotification loggingMessageNotific
 		this.asyncServer.loggingNotification(loggingMessageNotification).block();
 	}
 
+	/**
+	 * Get the server capabilities that define the supported features and functionality.
+	 * @return The server capabilities
+	 */
+	public McpSchema.ServerCapabilities getServerCapabilities() {
+		return this.asyncServer.getServerCapabilities();
+	}
+
+	/**
+	 * Get the server implementation information.
+	 * @return The server implementation details
+	 */
+	public McpSchema.Implementation getServerInfo() {
+		return this.asyncServer.getServerInfo();
+	}
+
+	/**
+	 * Get the client capabilities that define the supported features and functionality.
+	 * @return The client capabilities
+	 */
+	public ClientCapabilities getClientCapabilities() {
+		return this.asyncServer.getClientCapabilities();
+	}
+
+	/**
+	 * Get the client implementation information.
+	 * @return The client implementation details
+	 */
+	public McpSchema.Implementation getClientInfo() {
+		return this.asyncServer.getClientInfo();
+	}
+
 	/**
 	 * Close the server gracefully.
 	 */