feat: add server/client metadata getters to MCP clients

Add getter methods to expose server and client capabilities and implementation
info in McpAsyncClient and McpSyncClient. Store server metadata received during
initialization for later access.

Author: tzolov

mcp/src/main/java/org/springframework/ai/mcp/client/McpAsyncClient.java

@@ -77,6 +77,21 @@ public class McpAsyncClient {
 	 */
 	private final McpSchema.ClientCapabilities clientCapabilities;
 
+	/**
+	 * Client implementation information.
+	 */
+	private final McpSchema.Implementation clientInfo;
+
+	/**
+	 * Server capabilities.
+	 */
+	private McpSchema.ServerCapabilities serverCapabilities;
+
+	/**
+	 * Server implementation information.
+	 */
+	private McpSchema.Implementation serverInfo;
+
 	/**
 	 * Roots define the boundaries of where servers can operate within the filesystem,
 	 * allowing them to understand which directories and files they have access to.
@@ -100,11 +115,6 @@ public class McpAsyncClient {
 	 */
 	private final McpTransport transport;
 
-	/**
-	 * Client implementation information.
-	 */
-	private Implementation clientInfo;
-
 	/**
 	 * Create a new McpAsyncClient with the given transport and session request-response
 	 * timeout.
@@ -241,6 +251,9 @@ public Mono<McpSchema.InitializeResult> initialize() {
 
 		return result.flatMap(initializeResult -> {
 
+			this.serverCapabilities = initializeResult.capabilities();
+			this.serverInfo = initializeResult.serverInfo();
+
 			logger.info("Server response with Protocol: {}, Capabilities: {}, Info: {} and Instructions {}",
 					initializeResult.protocolVersion(), initializeResult.capabilities(), initializeResult.serverInfo(),
 					initializeResult.instructions());
@@ -256,6 +269,38 @@ public Mono<McpSchema.InitializeResult> initialize() {
 		});
 	}
 
+	/**
+	 * 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;
+	}
+
 	/**
 	 * Closes the client connection immediately.
 	 */

mcp/src/main/java/org/springframework/ai/mcp/client/McpSyncClient.java

@@ -22,6 +22,7 @@
 import org.slf4j.LoggerFactory;
 
 import org.springframework.ai.mcp.spec.McpSchema;
+import org.springframework.ai.mcp.spec.McpSchema.ClientCapabilities;
 import org.springframework.ai.mcp.spec.McpSchema.GetPromptRequest;
 import org.springframework.ai.mcp.spec.McpSchema.GetPromptResult;
 import org.springframework.ai.mcp.spec.McpSchema.ListPromptsResult;
@@ -49,6 +50,38 @@ public McpSyncClient(McpAsyncClient delegate) {
 		this.delegate = delegate;
 	}
 
+	/**
+	 * Get the server capabilities that define the supported features and functionality.
+	 * @return The server capabilities
+	 */
+	public McpSchema.ServerCapabilities getServerCapabilities() {
+		return this.delegate.getServerCapabilities();
+	}
+
+	/**
+	 * Get the server implementation information.
+	 * @return The server implementation details
+	 */
+	public McpSchema.Implementation getServerInfo() {
+		return this.delegate.getServerInfo();
+	}
+
+	/**
+	 * Get the client capabilities that define the supported features and functionality.
+	 * @return The client capabilities
+	 */
+	public ClientCapabilities getClientCapabilities() {
+		return this.delegate.getClientCapabilities();
+	}
+
+	/**
+	 * Get the client implementation information.
+	 * @return The client implementation details
+	 */
+	public McpSchema.Implementation getClientInfo() {
+		return this.delegate.getClientInfo();
+	}
+
 	@Override
 	public void close() {
 		this.delegate.close();