feat(server): add ability to retrieve server instructions

Author: zmeggyesi

mcp/src/main/java/io/modelcontextprotocol/server/McpAsyncServer.java

@@ -35,6 +35,7 @@
 import org.slf4j.LoggerFactory;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
+import reactor.util.annotation.Nullable;
 
 /**
  * The Model Context Protocol (MCP) server implementation that provides asynchronous
@@ -236,6 +237,15 @@ public McpSchema.Implementation getServerInfo() {
 		return this.serverInfo;
 	}
 
+	/**
+	 * Get the server instructions if available
+	 * @return The preset instructions for communication with the server
+	 */
+	@Nullable
+	public String getInstructions() {
+		return this.instructions;
+	}
+
 	/**
 	 * 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/io/modelcontextprotocol/server/McpSyncServer.java

@@ -7,6 +7,7 @@
 import io.modelcontextprotocol.spec.McpSchema;
 import io.modelcontextprotocol.spec.McpSchema.LoggingMessageNotification;
 import io.modelcontextprotocol.util.Assert;
+import reactor.util.annotation.Nullable;
 
 /**
  * A synchronous implementation of the Model Context Protocol (MCP) server that wraps
@@ -134,6 +135,15 @@ public McpSchema.Implementation getServerInfo() {
 		return this.asyncServer.getServerInfo();
 	}
 
+	/**
+	 * Get the server instructions if available
+	 * @return The preset instructions for communication with the server
+	 */
+	@Nullable
+	public String getInstructions() {
+		return this.getAsyncServer().getInstructions();
+	}
+
 	/**
 	 * Notify clients that the list of available resources has changed.
 	 */