// 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
//
//     http://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.

syntax = "proto3";

package google.cloud.ces.v1;

import "google/api/field_behavior.proto";
import "google/api/resource.proto";

option go_package = "cloud.google.com/go/ces/apiv1/cespb;cespb";
option java_multiple_files = true;
option java_outer_classname = "AgentToolProto";
option java_package = "com.google.cloud.ces.v1";

// Represents a tool that allows the agent to call another agent.
message AgentTool {
  // Required. The name of the agent tool.
  string name = 1 [(google.api.field_behavior) = REQUIRED];

  // Optional. Description of the tool's purpose.
  string description = 2 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The resource name of the root agent that is the entry point of
  // the tool. Format: `projects/{project}/locations/{location}/agents/{agent}`
  string root_agent = 3 [
    (google.api.field_behavior) = OPTIONAL,
    (google.api.resource_reference) = { type: "ces.googleapis.com/Agent" }
  ];
}