fix(rest): include missing query params in listTasks and listTaskPushNotificationConfigs

client/transport/rest/src/main/java/org/a2aproject/sdk/client/transport/rest/RestTransport.java

@@ -241,7 +241,7 @@ public ListTasksResult listTasks(ListTasksParams request, @Nullable ClientCallCo
 
 
     private String buildListTasksQueryString(ListTasksParams request) {
-        java.util.List<String> queryParts = new java.util.ArrayList<>();
+        List<String> queryParts = new java.util.ArrayList<>();
         if (request.contextId() != null) {
             queryParts.add("contextId=" + URLEncoder.encode(request.contextId(), StandardCharsets.UTF_8));
         }
@@ -257,12 +257,27 @@ private String buildListTasksQueryString(ListTasksParams request) {
         if (request.historyLength() != null) {
             queryParts.add("historyLength=" + request.historyLength());
         }
+        if (request.statusTimestampAfter() != null) {
+            queryParts.add("statusTimestampAfter=" + URLEncoder.encode(
+                    request.statusTimestampAfter().toString(), StandardCharsets.UTF_8));
+        }
         if (request.includeArtifacts() != null && request.includeArtifacts()) {
             queryParts.add("includeArtifacts=true");
         }
         return String.join("&", queryParts);
     }
 
+    private String buildListPushNotificationConfigsQueryString(ListTaskPushNotificationConfigsParams request) {
+        List<String> queryParts = new java.util.ArrayList<>();
+        if (request.pageSize() > 0) {
+            queryParts.add("pageSize=" + request.pageSize());
+        }
+        if (request.pageToken() != null && !request.pageToken().isEmpty()) {
+            queryParts.add("pageToken=" + URLEncoder.encode(request.pageToken(), StandardCharsets.UTF_8));
+        }
+        return String.join("&", queryParts);
+    }
+
     @Override
     public TaskPushNotificationConfig createTaskPushNotificationConfiguration(TaskPushNotificationConfig request, @Nullable ClientCallContext context) throws A2AClientException {
         checkNotNullParam("request", request);
@@ -325,8 +340,13 @@ public ListTaskPushNotificationConfigsResult listTaskPushNotificationConfigurati
         PayloadAndHeaders payloadAndHeaders = applyInterceptors(LIST_TASK_PUSH_NOTIFICATION_CONFIG_METHOD, builder,
                 agentCard, context);
         try {
-            String url = Utils.buildBaseUrl(agentInterface, request.tenant()) + String.format("/tasks/%1s/pushNotificationConfigs", request.id());
-            A2AHttpClient.GetBuilder getBuilder = httpClient.createGet().url(url);
+            StringBuilder urlBuilder = new StringBuilder(Utils.buildBaseUrl(agentInterface, request.tenant()));
+            urlBuilder.append(String.format("/tasks/%1s/pushNotificationConfigs", request.id()));
+            String queryString = buildListPushNotificationConfigsQueryString(request);
+            if (!queryString.isEmpty()) {
+                urlBuilder.append("?").append(queryString);
+            }
+            A2AHttpClient.GetBuilder getBuilder = httpClient.createGet().url(urlBuilder.toString());
             addStandardHeaders(getBuilder, payloadAndHeaders);
             A2AHttpResponse response = getBuilder.get();
             if (!response.success()) {

client/transport/rest/src/test/java/org/a2aproject/sdk/client/transport/rest/JsonRestMessages.java

@@ -387,4 +387,20 @@ public class JsonRestMessages {
                 "id": "task-1234"
              }
             }""";
+
+    static final String LIST_TASKS_TEST_RESPONSE = """
+            {
+              "tasks": [
+                {
+                  "id": "de38c76d-d54c-436c-8b9f-4c2703648d64",
+                  "contextId": "c295ea44-7543-4f78-b524-7a38915ad6e4",
+                  "status": {
+                    "state": "TASK_STATE_COMPLETED"
+                  },
+                  "metadata": {}
+                }
+              ],
+              "totalSize": 1,
+              "nextPageToken": ""
+            }""";
 }

client/transport/rest/src/test/java/org/a2aproject/sdk/client/transport/rest/RestTransportTest.java

@@ -6,6 +6,7 @@
 import static org.a2aproject.sdk.client.transport.rest.JsonRestMessages.GET_TASK_PUSH_NOTIFICATION_CONFIG_TEST_RESPONSE;
 import static org.a2aproject.sdk.client.transport.rest.JsonRestMessages.GET_TASK_TEST_RESPONSE;
 import static org.a2aproject.sdk.client.transport.rest.JsonRestMessages.LIST_TASK_PUSH_NOTIFICATION_CONFIG_TEST_RESPONSE;
+import static org.a2aproject.sdk.client.transport.rest.JsonRestMessages.LIST_TASKS_TEST_RESPONSE;
 import static org.a2aproject.sdk.client.transport.rest.JsonRestMessages.SEND_MESSAGE_STREAMING_TEST_REQUEST;
 import static org.a2aproject.sdk.client.transport.rest.JsonRestMessages.SEND_MESSAGE_STREAMING_TEST_RESPONSE;
 import static org.a2aproject.sdk.client.transport.rest.JsonRestMessages.SEND_MESSAGE_TEST_REQUEST;
@@ -22,6 +23,7 @@
 import static org.mockserver.model.HttpResponse.response;
 
 import java.io.IOException;
+import java.time.Instant;
 import java.util.Collections;
 import java.util.List;
 import java.util.concurrent.CountDownLatch;
@@ -48,6 +50,7 @@
 import org.a2aproject.sdk.spec.GetTaskPushNotificationConfigParams;
 import org.a2aproject.sdk.spec.ListTaskPushNotificationConfigsParams;
 import org.a2aproject.sdk.spec.ListTaskPushNotificationConfigsResult;
+import org.a2aproject.sdk.spec.ListTasksParams;
 import org.a2aproject.sdk.spec.Message;
 import org.a2aproject.sdk.spec.MessageSendConfiguration;
 import org.a2aproject.sdk.spec.MessageSendParams;
@@ -633,4 +636,65 @@ public void testVersionNotSupportedErrorUnmarshallingStreaming() throws Exceptio
         assertTrue(versionError.getMessage().contains("2.0"));
         assertTrue(versionError.getMessage().contains("1.0"));
     }
+
+    /**
+     * Regression test for #1233: listTasks must include statusTimestampAfter in the query string.
+     * The mock server only responds when the parameter is present; without the fix the mock will
+     * not match and the client throws an exception, causing the assertion to fail.
+     */
+    @Test
+    public void testListTasksIncludesStatusTimestampAfterQueryParam() throws Exception {
+        Instant cutoff = Instant.parse("2026-10-01T00:00:00Z");
+        this.server.when(
+                request()
+                        .withMethod("GET")
+                        .withPath("/tasks")
+                        .withQueryStringParameter("statusTimestampAfter", "2026-10-01T00:00:00Z")
+        )
+                .respond(
+                        response()
+                                .withStatusCode(200)
+                                .withBody(LIST_TASKS_TEST_RESPONSE)
+                );
+
+        RestTransport client = new RestTransport(CARD);
+        ListTasksParams params = ListTasksParams.builder()
+                .statusTimestampAfter(cutoff)
+                .build();
+
+        var result = client.listTasks(params, null);
+        assertEquals(1, result.tasks().size());
+        assertEquals("de38c76d-d54c-436c-8b9f-4c2703648d64", result.tasks().get(0).id());
+    }
+
+    /**
+     * Regression test for #1233: listTaskPushNotificationConfigurations must include pageSize and
+     * pageToken in the query string. The mock server only responds when both parameters are present;
+     * without the fix the mock will not match and the client throws an exception.
+     */
+    @Test
+    public void testListTaskPushNotificationConfigurationsIncludesPaginationQueryParams() throws Exception {
+        this.server.when(
+                request()
+                        .withMethod("GET")
+                        .withPath("/tasks/de38c76d-d54c-436c-8b9f-4c2703648d64/pushNotificationConfigs")
+                        .withQueryStringParameter("pageSize", "10")
+                        .withQueryStringParameter("pageToken", "next-page-token")
+        )
+                .respond(
+                        response()
+                                .withStatusCode(200)
+                                .withBody(LIST_TASK_PUSH_NOTIFICATION_CONFIG_TEST_RESPONSE)
+                );
+
+        RestTransport client = new RestTransport(CARD);
+        ListTaskPushNotificationConfigsParams params = ListTaskPushNotificationConfigsParams.builder()
+                .id("de38c76d-d54c-436c-8b9f-4c2703648d64")
+                .pageSize(10)
+                .pageToken("next-page-token")
+                .build();
+
+        ListTaskPushNotificationConfigsResult result = client.listTaskPushNotificationConfigurations(params, null);
+        assertEquals(2, result.configs().size());
+    }
 }