feat(ces): generate library

README.md

@@ -176,6 +176,9 @@ See each library's `README.md` file for more information about:
 - [Certificate Manager API](google/cloud/certificatemanager/README.md)
   [[quickstart]](google/cloud/certificatemanager/quickstart/README.md)
   [[reference]](https://cloud.google.com/cpp/docs/reference/certificatemanager/latest)
+- [Gemini Enterprise for Customer Experience API](google/cloud/ces/README.md)
+  [[quickstart]](google/cloud/ces/quickstart/README.md)
+  [[reference]](https://cloud.google.com/cpp/docs/reference/ces/latest)
 - [Cloud Channel API](google/cloud/channel/README.md)
   [[quickstart]](google/cloud/channel/quickstart/README.md)
   [[reference]](https://cloud.google.com/cpp/docs/reference/channel/latest)

ci/etc/expected_install_directories

@@ -171,6 +171,10 @@
 ./include/google/cloud/certificatemanager/v1
 ./include/google/cloud/certificatemanager/v1/internal
 ./include/google/cloud/certificatemanager/v1/mocks
+./include/google/cloud/ces
+./include/google/cloud/ces/v1
+./include/google/cloud/ces/v1/internal
+./include/google/cloud/ces/v1/mocks
 ./include/google/cloud/channel
 ./include/google/cloud/channel/v1
 ./include/google/cloud/channel/v1/internal
@@ -1326,6 +1330,8 @@
 ./lib64/cmake/google_cloud_cpp_binaryauthorization_mocks
 ./lib64/cmake/google_cloud_cpp_certificatemanager
 ./lib64/cmake/google_cloud_cpp_certificatemanager_mocks
+./lib64/cmake/google_cloud_cpp_ces
+./lib64/cmake/google_cloud_cpp_ces_mocks
 ./lib64/cmake/google_cloud_cpp_channel
 ./lib64/cmake/google_cloud_cpp_channel_mocks
 ./lib64/cmake/google_cloud_cpp_chronicle

cmake/GoogleCloudCppFeatures.cmake

@@ -67,6 +67,7 @@ set(GOOGLE_CLOUD_CPP_GA_LIBRARIES
     "billing"
     "binaryauthorization"
     "certificatemanager"
+    "ces"
     "channel"
     "chronicle"
     "cloudbuild"

external/googleapis/protodeps/ces.deps

@@ -0,0 +1,8 @@
+@googleapis//google/api:annotations_proto
+@googleapis//google/api:client_proto
+@googleapis//google/api:field_behavior_proto
+@googleapis//google/api:http_proto
+@googleapis//google/api:launch_stage_proto
+@googleapis//google/api:resource_proto
+@googleapis//google/longrunning:operations_proto
+@googleapis//google/rpc:status_proto

external/googleapis/protolists/ces.list

@@ -0,0 +1,38 @@
+@googleapis//google/cloud/ces/v1:agent.proto
+@googleapis//google/cloud/ces/v1:agent_service.proto
+@googleapis//google/cloud/ces/v1:agent_transfers.proto
+@googleapis//google/cloud/ces/v1:app.proto
+@googleapis//google/cloud/ces/v1:app_version.proto
+@googleapis//google/cloud/ces/v1:auth.proto
+@googleapis//google/cloud/ces/v1:bigquery_export.proto
+@googleapis//google/cloud/ces/v1:changelog.proto
+@googleapis//google/cloud/ces/v1:client_function.proto
+@googleapis//google/cloud/ces/v1:common.proto
+@googleapis//google/cloud/ces/v1:connector_tool.proto
+@googleapis//google/cloud/ces/v1:connector_toolset.proto
+@googleapis//google/cloud/ces/v1:conversation.proto
+@googleapis//google/cloud/ces/v1:data_store.proto
+@googleapis//google/cloud/ces/v1:data_store_tool.proto
+@googleapis//google/cloud/ces/v1:deployment.proto
+@googleapis//google/cloud/ces/v1:example.proto
+@googleapis//google/cloud/ces/v1:fakes.proto
+@googleapis//google/cloud/ces/v1:file_search_tool.proto
+@googleapis//google/cloud/ces/v1:google_search_tool.proto
+@googleapis//google/cloud/ces/v1:guardrail.proto
+@googleapis//google/cloud/ces/v1:mcp_tool.proto
+@googleapis//google/cloud/ces/v1:mcp_toolset.proto
+@googleapis//google/cloud/ces/v1:omnichannel.proto
+@googleapis//google/cloud/ces/v1:omnichannel_service.proto
+@googleapis//google/cloud/ces/v1:open_api_tool.proto
+@googleapis//google/cloud/ces/v1:open_api_toolset.proto
+@googleapis//google/cloud/ces/v1:python_function.proto
+@googleapis//google/cloud/ces/v1:schema.proto
+@googleapis//google/cloud/ces/v1:search_suggestions.proto
+@googleapis//google/cloud/ces/v1:session_service.proto
+@googleapis//google/cloud/ces/v1:system_tool.proto
+@googleapis//google/cloud/ces/v1:tool.proto
+@googleapis//google/cloud/ces/v1:tool_service.proto
+@googleapis//google/cloud/ces/v1:toolset.proto
+@googleapis//google/cloud/ces/v1:toolset_tool.proto
+@googleapis//google/cloud/ces/v1:widget_service.proto
+@googleapis//google/cloud/ces/v1:widget_tool.proto

external/googleapis/update_libraries.sh

@@ -93,6 +93,7 @@ declare -A -r LIBRARIES=(
       "@googleapis//google/cloud/certificatemanager/logging/v1:logging_cc_grpc" \
       "@googleapis//google/cloud/certificatemanager/v1:certificatemanager_cc_grpc"
   )"
+  ["ces"]="@googleapis//google/cloud/ces/v1:ces_cc_grpc"
   ["channel"]="@googleapis//google/cloud/channel/v1:channel_cc_grpc"
   ["chronicle"]="@googleapis//google/cloud/chronicle/v1:chronicle_cc_grpc"
   ["cloudbuild"]="$(

generator/generator_config.textproto

@@ -666,6 +666,35 @@ service {
   retryable_status_codes: ["kUnavailable"]
 }
 
+# CES
+service {
+  service_proto_path: "google/cloud/ces/v1/agent_service.proto"
+  product_path: "google/cloud/ces/v1"
+  initial_copyright_year: "2026"
+  retryable_status_codes: ["kUnavailable"]
+}
+
+service {
+  service_proto_path: "google/cloud/ces/v1/widget_service.proto"
+  product_path: "google/cloud/ces/v1"
+  initial_copyright_year: "2026"
+  retryable_status_codes: ["kUnavailable"]
+}
+
+service {
+  service_proto_path: "google/cloud/ces/v1/tool_service.proto"
+  product_path: "google/cloud/ces/v1"
+  initial_copyright_year: "2026"
+  retryable_status_codes: ["kUnavailable"]
+}
+
+service {
+  service_proto_path: "google/cloud/ces/v1/session_service.proto"
+  product_path: "google/cloud/ces/v1"
+  initial_copyright_year: "2026"
+  retryable_status_codes: ["kUnavailable"]
+}
+
 # Chronicle
 service {
   service_proto_path: "google/cloud/chronicle/v1/entity.proto"

generator/internal/format_method_comments.cc

@@ -192,9 +192,10 @@ MethodCommentSubstitution substitutions[] = {
     {kDialogflowEsConversationsProto, kDialogflowEsConversationsCpp},
 
     // From google/cloud/visionai/v1/warehouse.proto
+    // From google/cloud/ces/v1/session_service.proto
     // The "---" are transformed into a <mdash/> element which breaks our docs
     // process.
-    {R"""(--- General Rules ---)""", R"""(General Rules:)"""},
+    {R"""(---)""", R"""(-)"""},
 
     // Add Doxygen-style comments
     {"\n", "\n  ///"},

google/cloud/ces/BUILD.bazel

@@ -0,0 +1,31 @@
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+load("//bazel:gapic.bzl", "cc_gapic_library")
+
+package(default_visibility = ["//visibility:private"])
+
+licenses(["notice"])  # Apache 2.0
+
+service_dirs = ["v1/"]
+
+googleapis_deps = [
+    "@googleapis//google/cloud/ces/v1:ces_cc_grpc",
+]
+
+cc_gapic_library(
+    name = "ces",
+    googleapis_deps = googleapis_deps,
+    service_dirs = service_dirs,
+)

google/cloud/ces/CMakeLists.txt

@@ -0,0 +1,36 @@
+# ~~~
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ~~~
+
+include(GoogleCloudCppLibrary)
+
+google_cloud_cpp_add_gapic_library(
+    ces "Gemini Enterprise for Customer Experience API" SERVICE_DIRS "v1/")
+
+if (BUILD_TESTING AND GOOGLE_CLOUD_CPP_ENABLE_CXX_EXCEPTIONS)
+    add_executable(ces_quickstart "quickstart/quickstart.cc")
+    target_link_libraries(ces_quickstart PRIVATE google-cloud-cpp::ces)
+    google_cloud_cpp_add_common_options(ces_quickstart)
+    add_test(
+        NAME ces_quickstart
+        COMMAND
+            cmake -P "${PROJECT_SOURCE_DIR}/cmake/quickstart-runner.cmake"
+            $<TARGET_FILE:ces_quickstart> GOOGLE_CLOUD_PROJECT
+            GOOGLE_CLOUD_CPP_TEST_REGION)
+    set_tests_properties(
+        ces_quickstart
+        PROPERTIES LABELS "integration-test;quickstart" PASS_REGULAR_EXPRESSION
+                   "Permanent error.*gcloud-cpp.retry.function=ListApps")
+endif ()

google/cloud/ces/README.md

@@ -0,0 +1,58 @@
+# Gemini Enterprise for Customer Experience API C++ Client Library
+
+This directory contains an idiomatic C++ client library for the
+[Gemini Enterprise for Customer Experience API][cloud-service-docs].
+
+While this library is **GA**, please note that the Google Cloud C++ client
+libraries do **not** follow [Semantic Versioning](https://semver.org/).
+
+## Quickstart
+
+The [quickstart/](quickstart/README.md) directory contains a minimal environment
+to get started using this client library in a larger project. The following
+"Hello World" program is used in this quickstart, and should give you a taste of
+this library.
+
+<!-- inject-quickstart-start -->
+
+```cc
+#include "google/cloud/ces/v1/agent_client.h"
+#include "google/cloud/location.h"
+#include <iostream>
+
+int main(int argc, char* argv[]) try {
+  if (argc != 3) {
+    std::cerr << "Usage: " << argv[0] << " project-id location-id\n";
+    return 1;
+  }
+
+  auto const location = google::cloud::Location(argv[1], argv[2]);
+
+  namespace ces = ::google::cloud::ces_v1;
+  auto client = ces::AgentServiceClient(ces::MakeAgentServiceConnection());
+
+  for (auto r : client.ListApps(location.FullName())) {
+    if (!r) throw std::move(r).status();
+    std::cout << r->DebugString() << "\n";
+  }
+
+  return 0;
+} catch (google::cloud::Status const& status) {
+  std::cerr << "google::cloud::Status thrown: " << status << "\n";
+  return 1;
+}
+```
+
+<!-- inject-quickstart-end -->
+
+## More Information
+
+- Official documentation about the
+  [Gemini Enterprise for Customer Experience API][cloud-service-docs] service
+- [Reference doxygen documentation][doxygen-link] for each release of this
+  client library
+- Detailed header comments in our [public `.h`][source-link] files
+
+[cloud-service-docs]: https://docs.cloud.google.com/customer-engagement-ai/conversational-agents/ps
+[doxygen-link]: https://cloud.google.com/cpp/docs/reference/ces/latest/
+[source-link]: https://github.com/googleapis/google-cloud-cpp/tree/main/google/cloud/ces

google/cloud/ces/doc/environment-variables.dox

@@ -0,0 +1,61 @@
+/*!
+@page ces-env Environment Variables
+
+A number of environment variables can be used to configure the behavior of
+the library. There are also functions to configure this behavior in code. The
+environment variables are convenient when troubleshooting problems.
+
+@section ces-env-endpoint Endpoint Overrides
+
+<!-- inject-endpoint-env-vars-start -->
+
+- `GOOGLE_CLOUD_CPP_AGENT_SERVICE_ENDPOINT=...` overrides the
+  `EndpointOption` (which defaults to "ces.googleapis.com")
+  used by `MakeAgentServiceConnection()`.
+
+- `GOOGLE_CLOUD_CPP_SESSION_SERVICE_ENDPOINT=...` overrides the
+  `EndpointOption` (which defaults to "ces.googleapis.com")
+  used by `MakeSessionServiceConnection()`.
+
+- `GOOGLE_CLOUD_CPP_TOOL_SERVICE_ENDPOINT=...` overrides the
+  `EndpointOption` (which defaults to "ces.googleapis.com")
+  used by `MakeToolServiceConnection()`.
+
+- `GOOGLE_CLOUD_CPP_WIDGET_SERVICE_ENDPOINT=...` overrides the
+  `EndpointOption` (which defaults to "ces.googleapis.com")
+  used by `MakeWidgetServiceConnection()`.
+
+<!-- inject-endpoint-env-vars-end -->
+
+@see google::cloud::EndpointOption
+
+@section ces-env-logging Logging
+
+`GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`: turns on tracing for most gRPC
+calls. The library injects an additional Stub decorator that prints each gRPC
+request and response.  Unless you have configured your own logging backend,
+you should also set `GOOGLE_CLOUD_CPP_ENABLE_CLOG` to produce any output on
+the program's console.
+
+@see google::cloud::LoggingComponentsOption
+
+`GOOGLE_CLOUD_CPP_TRACING_OPTIONS=...`: modifies the behavior of gRPC tracing,
+including whether messages will be output on multiple lines, or whether
+string/bytes fields will be truncated.
+
+@see google::cloud::GrpcTracingOptionsOption
+
+`GOOGLE_CLOUD_CPP_ENABLE_CLOG=yes`: turns on logging in the library, basically
+the library always "logs" but the logging infrastructure has no backend to
+actually print anything until the application sets a backend or they set this
+environment variable.
+
+@see google::cloud::LogBackend
+@see google::cloud::LogSink
+
+@section ces-env-project Setting the Default Project
+
+`GOOGLE_CLOUD_PROJECT=...`: is used in examples and integration tests to
+configure the GCP project. This has no effect in the library.
+
+*/

google/cloud/ces/doc/main.dox

@@ -0,0 +1,56 @@
+/*!
+
+@mainpage Gemini Enterprise for Customer Experience API C++ Client Library
+
+An idiomatic C++ client library for the [Gemini Enterprise for Customer Experience API][cloud-service-docs].
+
+
+
+While this library is **GA**, please note that the Google Cloud C++ client libraries do **not** follow
+[Semantic Versioning](https://semver.org/).
+
+@tableofcontents{HTML:2}
+
+## Quickstart
+
+The following shows the code that you'll run in the
+`google/cloud/ces/quickstart/` directory,
+which should give you a taste of the Gemini Enterprise for Customer Experience API C++ client library API.
+
+@snippet quickstart.cc all
+
+## Main classes
+
+<!-- inject-client-list-start -->
+This library offers multiple `*Client` classes, which are listed below. Each one
+of these classes exposes all the RPCs for a service as member functions of the
+class. This library groups multiple services because they are part of the same
+product or are often used together. A typical example may be the administrative
+and data plane operations for a single product.
+
+The library also has other classes that provide helpers, configuration
+parameters, and infrastructure to mock the `*Client` classes when testing your
+application.
+
+- [\c ces_v1::AgentServiceClient](@ref google::cloud::ces_v1::AgentServiceClient)
+- [\c ces_v1::SessionServiceClient](@ref google::cloud::ces_v1::SessionServiceClient)
+- [\c ces_v1::ToolServiceClient](@ref google::cloud::ces_v1::ToolServiceClient)
+- [\c ces_v1::WidgetServiceClient](@ref google::cloud::ces_v1::WidgetServiceClient)
+<!-- inject-client-list-end -->
+
+## More Information
+
+- @ref common-error-handling - describes how the library reports errors.
+- @ref ces-override-endpoint - describes how to override the default
+  endpoint.
+- @ref ces-override-authentication - describes how to change the
+  authentication credentials used by the library.
+- @ref ces-override-retry - describes how to change the default retry
+  policies.
+- @ref ces-env - describes environment variables that can configure the
+  behavior of the library.
+- @ref ces-override-universe-domain - describes how to override the default universe domain.
+
+[cloud-service-docs]: https://docs.cloud.google.com/customer-engagement-ai/conversational-agents/ps
+
+*/

google/cloud/ces/doc/options.dox

@@ -0,0 +1,10 @@
+/*!
+@defgroup google-cloud-ces-options Gemini Enterprise for Customer Experience API Configuration Options
+
+This library uses the same mechanism (`google::cloud::Options`) and the common
+[options](@ref options) as all other C++ client libraries for its configuration.
+Some `*Option` classes, which are only used in this library, are documented in
+this page.
+
+@see @ref options - for an overview of client library configuration.
+*/