fix: check error.message not result.content for permission denied detection

When a tool call is denied due to no permission handler, the SDK emits
a tool.execution_complete event with success=false and the denial message
in the error.message field (not result.content).

Update all 4 language e2e tests to assert on error.message.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: SteveSandersonMS

dotnet/test/PermissionTests.cs

@@ -80,7 +80,7 @@ public async Task Should_Deny_Tool_Operations_By_Default_When_No_Handler_Is_Prov
         {
             if (evt is ToolExecutionCompleteEvent toolEvt &&
                 !toolEvt.Data.Success &&
-                toolEvt.Data.Result?.Content.Contains("Permission denied") == true)
+                toolEvt.Data.Error?.Message.Contains("Permission denied") == true)
             {
                 permissionDenied = true;
             }

go/internal/e2e/permissions_test.go

@@ -171,7 +171,8 @@ func TestPermissions(t *testing.T) {
 		session.On(func(event copilot.SessionEvent) {
 			if event.Type == copilot.ToolExecutionComplete &&
 				event.Data.Success != nil && !*event.Data.Success &&
-				event.Data.Result != nil && strings.Contains(event.Data.Result.Content, "Permission denied") {
+				event.Data.Error != nil && event.Data.Error.ErrorClass != nil &&
+				strings.Contains(event.Data.Error.ErrorClass.Message, "Permission denied") {
 				mu.Lock()
 				permissionDenied = true
 				mu.Unlock()

nodejs/test/e2e/permissions.test.ts

@@ -71,7 +71,7 @@ describe("Permission callbacks", async () => {
             if (
                 event.type === "tool.execution_complete" &&
                 !event.data.success &&
-                event.data.result?.content.includes("Permission denied")
+                event.data.error?.message.includes("Permission denied")
             ) {
                 permissionDenied = true;
             }

python/e2e/test_permissions.py

@@ -79,14 +79,11 @@ async def test_should_deny_tool_operations_by_default_when_no_handler_is_provide
         done_event = asyncio.Event()
 
         def on_event(event):
-            if (
-                event.type.value == "tool.execution_complete"
-                and event.data.success is False
-                and event.data.result is not None
-                and event.data.result.content is not None
-                and "Permission denied" in event.data.result.content
-            ):
-                denied_events.append(event)
+            if event.type.value == "tool.execution_complete" and event.data.success is False:
+                error = event.data.error
+                msg = error if isinstance(error, str) else (getattr(error, "message", None) if error is not None else None)
+                if msg and "Permission denied" in msg:
+                    denied_events.append(event)
             elif event.type.value == "session.idle":
                 done_event.set()