diff --git a/cookbook/copilot-sdk/java/accessibility-report.md b/cookbook/copilot-sdk/java/accessibility-report.md
index 785b3a42..83a1853c 100644
--- a/cookbook/copilot-sdk/java/accessibility-report.md
+++ b/cookbook/copilot-sdk/java/accessibility-report.md
@@ -67,11 +67,12 @@ public class AccessibilityReport {
             client.start().get();
 
             // Configure Playwright MCP server for browser automation
-            var mcpConfig = new McpServerConfig()
-                .setType("local")
-                .setCommand("npx")
-                .setArgs(List.of("@playwright/mcp@latest"))
-                .setTools(List.of("*"));
+            Map<String, Object> mcpConfig = Map.of(
+                "type", "local",
+                "command", "npx",
+                "args", List.of("@playwright/mcp@latest"),
+                "tools", List.of("*")
+            );
 
             var session = client.createSession(
                 new SessionConfig()
@@ -167,11 +168,12 @@ public class AccessibilityReport {
 The recipe configures a local MCP server that runs alongside the session:
 
 ```java
-var mcpConfig = new McpServerConfig()
-    .setType("local")
-    .setCommand("npx")
-    .setArgs(List.of("@playwright/mcp@latest"))
-    .setTools(List.of("*"));
+Map<String, Object> mcpConfig = Map.of(
+    "type", "local",
+    "command", "npx",
+    "args", List.of("@playwright/mcp@latest"),
+    "tools", List.of("*")
+);
 
 var session = client.createSession(
     new SessionConfig()
diff --git a/cookbook/copilot-sdk/java/error-handling.md b/cookbook/copilot-sdk/java/error-handling.md
index 8c2dd026..a21c4f75 100644
--- a/cookbook/copilot-sdk/java/error-handling.md
+++ b/cookbook/copilot-sdk/java/error-handling.md
@@ -150,27 +150,42 @@ try (var client = new CopilotClient()) {
 
 ## Handling tool errors
 
-When defining tools, return an error result to signal a failure back to the model instead of throwing.
+When defining tools, return an error string to signal a failure back to the model instead of throwing.
 
 ```java
-import com.github.copilot.sdk.json.ToolResultObject;
+import com.github.copilot.sdk.json.ToolDefinition;
+import java.util.concurrent.CompletableFuture;
 
-session.addTool(
-    ToolDefinition.builder()
-        .name("read_file")
-        .description("Read a file from disk")
-        .parameter("path", "string", "File path", true)
-        .build(),
-    (args) -> {
+var readFileTool = ToolDefinition.create(
+    "read_file",
+    "Read a file from disk",
+    Map.of(
+        "type", "object",
+        "properties", Map.of(
+            "path", Map.of("type", "string", "description", "File path")
+        ),
+        "required", List.of("path")
+    ),
+    invocation -> {
         try {
+            var path = (String) invocation.getArguments().get("path");
             var content = java.nio.file.Files.readString(
-                java.nio.file.Path.of(args.get("path").toString()));
-            return ToolResultObject.success(content);
-        } catch (IOException ex) {
-            return ToolResultObject.error("Failed to read file: " + ex.getMessage());
+                java.nio.file.Path.of(path));
+            return CompletableFuture.completedFuture(content);
+        } catch (java.io.IOException ex) {
+            return CompletableFuture.completedFuture(
+                "Error: Failed to read file: " + ex.getMessage());
         }
     }
 );
+
+// Register tools when creating the session
+var session = client.createSession(
+    new SessionConfig()
+        .setOnPermissionRequest(PermissionHandler.APPROVE_ALL)
+        .setModel("gpt-5")
+        .setTools(List.of(readFileTool))
+).get();
 ```
 
 ## Best practices
@@ -179,5 +194,5 @@ session.addTool(
 2. **Unwrap `ExecutionException`**: Call `getCause()` to inspect the real error — the outer `ExecutionException` is just a `CompletableFuture` wrapper.
 3. **Restore interrupt flag**: When catching `InterruptedException`, call `Thread.currentThread().interrupt()` to preserve the interrupted status.
 4. **Set timeouts**: Use `get(timeout, TimeUnit)` instead of bare `get()` for any call that could block indefinitely.
-5. **Return tool errors, don't throw**: Use `ToolResultObject.error()` so the model can recover gracefully.
+5. **Return tool errors, don't throw**: Return an error string from the `CompletableFuture` so the model can recover gracefully.
 6. **Log errors**: Capture error details for debugging — consider a logging framework like SLF4J for production applications.
diff --git a/cookbook/copilot-sdk/java/multiple-sessions.md b/cookbook/copilot-sdk/java/multiple-sessions.md
index b44a4d76..4508e565 100644
--- a/cookbook/copilot-sdk/java/multiple-sessions.md
+++ b/cookbook/copilot-sdk/java/multiple-sessions.md
@@ -48,9 +48,9 @@ public class MultipleSessions {
             session3.sendAndWait(new MessageOptions().setPrompt("How do I initialize a module?")).get();
 
             // Clean up all sessions
-            session1.destroy().get();
-            session2.destroy().get();
-            session3.destroy().get();
+            session1.close();
+            session2.close();
+            session3.close();
         }
     }
 }
@@ -136,7 +136,7 @@ var session = client.createSession(new SessionConfig()
 
 session.sendAndWait(new MessageOptions().setPrompt("Hello!")).get();
 
-session.destroy().get();
+session.close();
 client.stop().get();
 executor.shutdown();
 ```
diff --git a/cookbook/copilot-sdk/java/recipe/AccessibilityReport.java b/cookbook/copilot-sdk/java/recipe/AccessibilityReport.java
index 748e5e09..b77f6419 100644
--- a/cookbook/copilot-sdk/java/recipe/AccessibilityReport.java
+++ b/cookbook/copilot-sdk/java/recipe/AccessibilityReport.java
@@ -43,11 +43,12 @@ public class AccessibilityReport {
             client.start().get();
 
             // Configure Playwright MCP server for browser automation
-            var mcpConfig = new McpServerConfig()
-                .setType("local")
-                .setCommand("npx")
-                .setArgs(List.of("@playwright/mcp@latest"))
-                .setTools(List.of("*"));
+            Map<String, Object> mcpConfig = Map.of(
+                "type", "local",
+                "command", "npx",
+                "args", List.of("@playwright/mcp@latest"),
+                "tools", List.of("*")
+            );
 
             var session = client.createSession(
                 new SessionConfig()
diff --git a/cookbook/copilot-sdk/java/recipe/MultipleSessions.java b/cookbook/copilot-sdk/java/recipe/MultipleSessions.java
index 2512bdaf..615dab80 100644
--- a/cookbook/copilot-sdk/java/recipe/MultipleSessions.java
+++ b/cookbook/copilot-sdk/java/recipe/MultipleSessions.java
@@ -30,8 +30,7 @@ public class MultipleSessions {
             System.out.println("S3: " + s3.sendAndWait(new MessageOptions().setPrompt("Explain pattern matching")).get().getData().content());
 
             // Clean up
-            s1.destroy().get(); s2.destroy().get(); s3.destroy().get();
-            client.stop().get();
+            s1.close(); s2.close(); s3.close();
         }
     }
 }