feat(agentregistry): generate library

CHANGELOG.md

@@ -9,6 +9,13 @@ for details on updating existing applications using v1.x.y or v2.x.y.
 
 ## v3.7.0 - TBD
 
+### New Libraries
+
+We are happy to announce the following GA libraries. Unless specifically noted,
+the APIs in these libraries are stable, and are ready for production use.
+
+- [Agent Registry API](/google/cloud/agentregistry/README.md)
+
 ## v3.6.0 - 2026-06
 
 ### New Libraries

README.md

@@ -107,6 +107,9 @@ See each library's `README.md` file for more information about:
 - [Advisory Notifications API](google/cloud/advisorynotifications/README.md)
   [[quickstart]](google/cloud/advisorynotifications/quickstart/README.md)
   [[reference]](https://cloud.google.com/cpp/docs/reference/advisorynotifications/latest)
+- [Agent Registry API](google/cloud/agentregistry/README.md)
+  [[quickstart]](google/cloud/agentregistry/quickstart/README.md)
+  [[reference]](https://cloud.google.com/cpp/docs/reference/agentregistry/latest)
 - [Vertex AI API](google/cloud/aiplatform/README.md)
   [[quickstart]](google/cloud/aiplatform/quickstart/README.md)
   [[reference]](https://cloud.google.com/cpp/docs/reference/aiplatform/latest)

ci/etc/expected_install_directories

@@ -32,6 +32,10 @@
 ./include/google/cloud/advisorynotifications/v1
 ./include/google/cloud/advisorynotifications/v1/internal
 ./include/google/cloud/advisorynotifications/v1/mocks
+./include/google/cloud/agentregistry
+./include/google/cloud/agentregistry/v1
+./include/google/cloud/agentregistry/v1/internal
+./include/google/cloud/agentregistry/v1/mocks
 ./include/google/cloud/aiplatform
 ./include/google/cloud/aiplatform/v1
 ./include/google/cloud/aiplatform/v1/internal
@@ -1304,6 +1308,8 @@
 ./lib64/cmake/google_cloud_cpp_accesscontextmanager_mocks
 ./lib64/cmake/google_cloud_cpp_advisorynotifications
 ./lib64/cmake/google_cloud_cpp_advisorynotifications_mocks
+./lib64/cmake/google_cloud_cpp_agentregistry
+./lib64/cmake/google_cloud_cpp_agentregistry_mocks
 ./lib64/cmake/google_cloud_cpp_aiplatform
 ./lib64/cmake/google_cloud_cpp_aiplatform_mocks
 ./lib64/cmake/google_cloud_cpp_alloydb

cmake/GoogleCloudCppFeatures.cmake

@@ -44,6 +44,7 @@ set(GOOGLE_CLOUD_CPP_GA_LIBRARIES
     "accessapproval"
     "accesscontextmanager"
     "advisorynotifications"
+    "agentregistry" # Generated 2026-06-26
     "aiplatform"
     "alloydb"
     "apigateway"

external/googleapis/protodeps/agentregistry.deps

@@ -0,0 +1,9 @@
+@googleapis//google/api:annotations_proto
+@googleapis//google/api:client_proto
+@googleapis//google/api:field_behavior_proto
+@googleapis//google/api:field_info_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/agentregistry.list

@@ -0,0 +1,7 @@
+@googleapis//google/cloud/agentregistry/v1:agent.proto
+@googleapis//google/cloud/agentregistry/v1:agentregistry_service.proto
+@googleapis//google/cloud/agentregistry/v1:binding.proto
+@googleapis//google/cloud/agentregistry/v1:endpoint.proto
+@googleapis//google/cloud/agentregistry/v1:mcp_server.proto
+@googleapis//google/cloud/agentregistry/v1:properties.proto
+@googleapis//google/cloud/agentregistry/v1:service.proto

external/googleapis/update_libraries.sh

@@ -17,6 +17,7 @@ set -euo pipefail
 
 declare -A -r LIBRARIES=(
   ["accessapproval"]="@googleapis//google/cloud/accessapproval/v1:accessapproval_cc_grpc"
+  ["agentregistry"]="@googleapis//google/cloud/agentregistry/v1:agentregistry_cc_grpc"
   ["accesscontextmanager"]="$(
     printf ",%s" \
       "@googleapis//google/identity/accesscontextmanager/type:type_cc_grpc" \

generator/generator_config.textproto

@@ -22,6 +22,14 @@ service {
   retryable_status_codes: ["kUnavailable"]
 }
 
+# Agent Registry
+service {
+  service_proto_path: "google/cloud/agentregistry/v1/agentregistry_service.proto"
+  product_path: "google/cloud/agentregistry/v1"
+  initial_copyright_year: "2026"
+  retryable_status_codes: ["kUnavailable"]
+}
+
 # Access Context Manager
 service {
   service_proto_path: "google/identity/accesscontextmanager/v1/access_context_manager.proto"

google/cloud/agentregistry/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/agentregistry/v1:agentregistry_cc_grpc",
+]
+
+cc_gapic_library(
+    name = "agentregistry",
+    googleapis_deps = googleapis_deps,
+    service_dirs = service_dirs,
+)

google/cloud/agentregistry/CMakeLists.txt

@@ -0,0 +1,37 @@
+# ~~~
+# 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(agentregistry "Agent Registry API"
+                                   SERVICE_DIRS "v1/")
+
+if (BUILD_TESTING AND GOOGLE_CLOUD_CPP_ENABLE_CXX_EXCEPTIONS)
+    add_executable(agentregistry_quickstart "quickstart/quickstart.cc")
+    target_link_libraries(agentregistry_quickstart
+                          PRIVATE google-cloud-cpp::agentregistry)
+    google_cloud_cpp_add_common_options(agentregistry_quickstart)
+    add_test(
+        NAME agentregistry_quickstart
+        COMMAND
+            cmake -P "${PROJECT_SOURCE_DIR}/cmake/quickstart-runner.cmake"
+            $<TARGET_FILE:agentregistry_quickstart> GOOGLE_CLOUD_PROJECT
+            GOOGLE_CLOUD_CPP_TEST_REGION)
+    set_tests_properties(
+        agentregistry_quickstart
+        PROPERTIES LABELS "integration-test;quickstart" PASS_REGULAR_EXPRESSION
+                   "Permanent error.*gcloud-cpp.retry.function=ListAgents")
+endif ()

google/cloud/agentregistry/README.md

@@ -0,0 +1,63 @@
+# Agent Registry API C++ Client Library
+
+This directory contains an idiomatic C++ client library for the
+[Agent Registry API][cloud-service-docs].
+
+Agent Registry is a centralized, unified catalog that lets you store, discover,
+and govern Model Context Protocol (MCP) servers, tools, and AI agents within
+Google Cloud.
+
+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/agentregistry/v1/agent_registry_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 agentregistry = ::google::cloud::agentregistry_v1;
+  auto client = agentregistry::AgentRegistryClient(
+      agentregistry::MakeAgentRegistryConnection());
+
+  for (auto r : client.ListAgents(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 [Agent Registry 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/agent-registry/overview
+[doxygen-link]: https://cloud.google.com/cpp/docs/reference/agentregistry/latest/
+[source-link]: https://github.com/googleapis/google-cloud-cpp/tree/main/google/cloud/agentregistry

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

@@ -0,0 +1,49 @@
+/*!
+@page agentregistry-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 agentregistry-env-endpoint Endpoint Overrides
+
+<!-- inject-endpoint-env-vars-start -->
+
+- `GOOGLE_CLOUD_CPP_AGENT_REGISTRY_ENDPOINT=...` overrides the
+  `EndpointOption` (which defaults to "agentregistry.googleapis.com")
+  used by `MakeAgentRegistryConnection()`.
+
+<!-- inject-endpoint-env-vars-end -->
+
+@see google::cloud::EndpointOption
+
+@section agentregistry-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 agentregistry-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/agentregistry/doc/main.dox

@@ -0,0 +1,50 @@
+/*!
+
+@mainpage Agent Registry API C++ Client Library
+
+An idiomatic C++ client library for the [Agent Registry API][cloud-service-docs].
+
+Agent Registry is a centralized, unified catalog that lets you store,
+discover, and govern Model Context Protocol (MCP) servers, tools, and AI
+agents within Google Cloud.
+
+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/agentregistry/quickstart/` directory,
+which should give you a taste of the Agent Registry API C++ client library API.
+
+@snippet quickstart.cc all
+
+## Main classes
+
+<!-- inject-client-list-start -->
+The main class in this library is
+[`agentregistry_v1::AgentRegistryClient`](@ref google::cloud::agentregistry_v1::AgentRegistryClient). All RPCs are exposed
+as member functions of this class. Other classes provide helpers, configuration
+parameters, and infrastructure to mock
+[`agentregistry_v1::AgentRegistryClient`](@ref google::cloud::agentregistry_v1::AgentRegistryClient) when testing your
+application.
+<!-- inject-client-list-end -->
+
+## More Information
+
+- @ref common-error-handling - describes how the library reports errors.
+- @ref agentregistry-override-endpoint - describes how to override the default
+  endpoint.
+- @ref agentregistry-override-authentication - describes how to change the
+  authentication credentials used by the library.
+- @ref agentregistry-override-retry - describes how to change the default retry
+  policies.
+- @ref agentregistry-env - describes environment variables that can configure the
+  behavior of the library.
+- @ref agentregistry-override-universe-domain - describes how to override the default universe domain.
+
+[cloud-service-docs]: https://docs.cloud.google.com/agent-registry/overview
+
+*/

google/cloud/agentregistry/doc/options.dox

@@ -0,0 +1,10 @@
+/*!
+@defgroup google-cloud-agentregistry-options Agent Registry 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.
+*/

google/cloud/agentregistry/doc/override-authentication.dox

@@ -0,0 +1,35 @@
+/*!
+@page agentregistry-override-authentication How to Override the Authentication Credentials
+
+Unless otherwise configured, the client libraries use
+[Application Default Credentials] to authenticate with Google Cloud Services.
+While this works for most applications, in some cases you may need to override
+this default. You can do so by providing the
+[UnifiedCredentialsOption](@ref google::cloud::UnifiedCredentialsOption)
+The following example shows how to explicitly load a service account key file:
+
+<!-- inject-service-account-snippet-start -->
+@snippet agent_registry_client_samples.cc with-service-account
+
+<!-- inject-service-account-snippet-end -->
+
+Keep in mind that we chose this as an example because it is relatively easy to
+understand. Consult the [Best practices for managing service account keys]
+guide for more details.
+
+@see @ref guac - for more information on the factory functions to create
+`google::cloud::Credentials` objects.
+
+[Best practices for managing service account keys]: https://cloud.google.com/iam/docs/best-practices-for-managing-service-account-keys
+[Application Default Credentials]: https://cloud.google.com/docs/authentication#adc
+
+*/
+
+// <!-- inject-authentication-pages-start -->
+
+/*! @page agentregistry_v1::AgentRegistryClient-service-account-snippet Override agentregistry_v1::AgentRegistryClient Authentication Defaults
+
+@snippet google/cloud/agentregistry/v1/samples/agent_registry_client_samples.cc with-service-account
+
+*/
+// <!-- inject-authentication-pages-end -->