// Copyright 2025 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.ai.generativelanguage.v1;

import "google/ai/generativelanguage/v1/citation.proto";
import "google/ai/generativelanguage/v1/content.proto";
import "google/ai/generativelanguage/v1/safety.proto";
import "google/api/annotations.proto";
import "google/api/client.proto";
import "google/api/field_behavior.proto";
import "google/api/resource.proto";

option go_package = "cloud.google.com/go/ai/generativelanguage/apiv1/generativelanguagepb;generativelanguagepb";
option java_multiple_files = true;
option java_outer_classname = "GenerativeServiceProto";
option java_package = "com.google.ai.generativelanguage.v1";

// API for using Large Models that generate multimodal content and have
// additional capabilities beyond text generation.
service GenerativeService {
  option (google.api.default_host) = "generativelanguage.googleapis.com";

  // Generates a model response given an input `GenerateContentRequest`.
  // Refer to the [text generation
  // guide](https://ai.google.dev/gemini-api/docs/text-generation) for detailed
  // usage information. Input capabilities differ between models, including
  // tuned models. Refer to the [model
  // guide](https://ai.google.dev/gemini-api/docs/models/gemini) and [tuning
  // guide](https://ai.google.dev/gemini-api/docs/model-tuning) for details.
  rpc GenerateContent(GenerateContentRequest)
      returns (GenerateContentResponse) {
    option (google.api.http) = {
      post: "/v1/{model=models/*}:generateContent"
      body: "*"
      additional_bindings {
        post: "/v1/{model=tunedModels/*}:generateContent"
        body: "*"
      }
      additional_bindings {
        post: "/v1/{model=dynamic/*}:generateContent"
        body: "*"
      }
    };
    option (google.api.method_signature) = "model,contents";
  }

  // Generates a [streamed
  // response](https://ai.google.dev/gemini-api/docs/text-generation?lang=python#generate-a-text-stream)
  // from the model given an input `GenerateContentRequest`.
  rpc StreamGenerateContent(GenerateContentRequest)
      returns (stream GenerateContentResponse) {
    option (google.api.http) = {
      post: "/v1/{model=models/*}:streamGenerateContent"
      body: "*"
      additional_bindings {
        post: "/v1/{model=tunedModels/*}:streamGenerateContent"
        body: "*"
      }
      additional_bindings {
        post: "/v1/{model=dynamic/*}:streamGenerateContent"
        body: "*"
      }
    };
    option (google.api.method_signature) = "model,contents";
  }

  // Generates a text embedding vector from the input `Content` using the
  // specified [Gemini Embedding
  // model](https://ai.google.dev/gemini-api/docs/models/gemini#text-embedding).
  rpc EmbedContent(EmbedContentRequest) returns (EmbedContentResponse) {
    option (google.api.http) = {
      post: "/v1/{model=models/*}:embedContent"
      body: "*"
    };
    option (google.api.method_signature) = "model,content";
  }

  // Generates multiple embedding vectors from the input `Content` which
  // consists of a batch of strings represented as `EmbedContentRequest`
  // objects.
  rpc BatchEmbedContents(BatchEmbedContentsRequest)
      returns (BatchEmbedContentsResponse) {
    option (google.api.http) = {
      post: "/v1/{model=models/*}:batchEmbedContents"
      body: "*"
    };
    option (google.api.method_signature) = "model,requests";
  }

  // Runs a model's tokenizer on input `Content` and returns the token count.
  // Refer to the [tokens guide](https://ai.google.dev/gemini-api/docs/tokens)
  // to learn more about tokens.
  rpc CountTokens(CountTokensRequest) returns (CountTokensResponse) {
    option (google.api.http) = {
      post: "/v1/{model=models/*}:countTokens"
      body: "*"
    };
    option (google.api.method_signature) = "model,contents";
  }
}

// Type of task for which the embedding will be used.
enum TaskType {
  // Unset value, which will default to one of the other enum values.
  TASK_TYPE_UNSPECIFIED = 0;

  // Specifies the given text is a query in a search/retrieval setting.
  RETRIEVAL_QUERY = 1;

  // Specifies the given text is a document from the corpus being searched.
  RETRIEVAL_DOCUMENT = 2;

  // Specifies the given text will be used for STS.
  SEMANTIC_SIMILARITY = 3;

  // Specifies that the given text will be classified.
  CLASSIFICATION = 4;

  // Specifies that the embeddings will be used for clustering.
  CLUSTERING = 5;

  // Specifies that the given text will be used for question answering.
  QUESTION_ANSWERING = 6;

  // Specifies that the given text will be used for fact verification.
  FACT_VERIFICATION = 7;

  // Specifies that the given text will be used for code retrieval.
  CODE_RETRIEVAL_QUERY = 8;
}

// Request to generate a completion from the model.
message GenerateContentRequest {
  // Required. The name of the `Model` to use for generating the completion.
  //
  // Format: `models/{model}`.
  string model = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      type: "generativelanguage.googleapis.com/Model"
    }
  ];

  // Required. The content of the current conversation with the model.
  //
  // For single-turn queries, this is a single instance. For multi-turn queries
  // like [chat](https://ai.google.dev/gemini-api/docs/text-generation#chat),
  // this is a repeated field that contains the conversation history and the
  // latest request.
  repeated Content contents = 2 [(google.api.field_behavior) = REQUIRED];

  // Optional. A list of unique `SafetySetting` instances for blocking unsafe
  // content.
  //
  // This will be enforced on the `GenerateContentRequest.contents` and
  // `GenerateContentResponse.candidates`. There should not be more than one
  // setting for each `SafetyCategory` type. The API will block any contents and
  // responses that fail to meet the thresholds set by these settings. This list
  // overrides the default settings for each `SafetyCategory` specified in the
  // safety_settings. If there is no `SafetySetting` for a given
  // `SafetyCategory` provided in the list, the API will use the default safety
  // setting for that category. Harm categories HARM_CATEGORY_HATE_SPEECH,
  // HARM_CATEGORY_SEXUALLY_EXPLICIT, HARM_CATEGORY_DANGEROUS_CONTENT,
  // HARM_CATEGORY_HARASSMENT, HARM_CATEGORY_CIVIC_INTEGRITY are supported.
  // Refer to the [guide](https://ai.google.dev/gemini-api/docs/safety-settings)
  // for detailed information on available safety settings. Also refer to the
  // [Safety guidance](https://ai.google.dev/gemini-api/docs/safety-guidance) to
  // learn how to incorporate safety considerations in your AI applications.
  repeated SafetySetting safety_settings = 3
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. Configuration options for model generation and outputs.
  optional GenerationConfig generation_config = 4
      [(google.api.field_behavior) = OPTIONAL];
}

// Configuration options for model generation and outputs. Not all parameters
// are configurable for every model.
message GenerationConfig {
  // Optional. Number of generated responses to return. If unset, this will
  // default to 1. Please note that this doesn't work for previous generation
  // models (Gemini 1.0 family)
  optional int32 candidate_count = 1 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The set of character sequences (up to 5) that will stop output
  // generation. If specified, the API will stop at the first appearance of a
  // `stop_sequence`. The stop sequence will not be included as part of the
  // response.
  repeated string stop_sequences = 2 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The maximum number of tokens to include in a response candidate.
  //
  // Note: The default value varies by model, see the `Model.output_token_limit`
  // attribute of the `Model` returned from the `getModel` function.
  optional int32 max_output_tokens = 4 [(google.api.field_behavior) = OPTIONAL];

  // Optional. Controls the randomness of the output.
  //
  // Note: The default value varies by model, see the `Model.temperature`
  // attribute of the `Model` returned from the `getModel` function.
  //
  // Values can range from [0.0, 2.0].
  optional float temperature = 5 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The maximum cumulative probability of tokens to consider when
  // sampling.
  //
  // The model uses combined Top-k and Top-p (nucleus) sampling.
  //
  // Tokens are sorted based on their assigned probabilities so that only the
  // most likely tokens are considered. Top-k sampling directly limits the
  // maximum number of tokens to consider, while Nucleus sampling limits the
  // number of tokens based on the cumulative probability.
  //
  // Note: The default value varies by `Model` and is specified by
  // the`Model.top_p` attribute returned from the `getModel` function. An empty
  // `top_k` attribute indicates that the model doesn't apply top-k sampling
  // and doesn't allow setting `top_k` on requests.
  optional float top_p = 6 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The maximum number of tokens to consider when sampling.
  //
  // Gemini models use Top-p (nucleus) sampling or a combination of Top-k and
  // nucleus sampling. Top-k sampling considers the set of `top_k` most probable
  // tokens. Models running with nucleus sampling don't allow top_k setting.
  //
  // Note: The default value varies by `Model` and is specified by
  // the`Model.top_p` attribute returned from the `getModel` function. An empty
  // `top_k` attribute indicates that the model doesn't apply top-k sampling
  // and doesn't allow setting `top_k` on requests.
  optional int32 top_k = 7 [(google.api.field_behavior) = OPTIONAL];

  // Optional. Seed used in decoding. If not set, the request uses a randomly
  // generated seed.
  optional int32 seed = 8 [(google.api.field_behavior) = OPTIONAL];

  // Optional. Presence penalty applied to the next token's logprobs if the
  // token has already been seen in the response.
  //
  // This penalty is binary on/off and not dependant on the number of times the
  // token is used (after the first). Use
  // [frequency_penalty][google.ai.generativelanguage.v1.GenerationConfig.frequency_penalty]
  // for a penalty that increases with each use.
  //
  // A positive penalty will discourage the use of tokens that have already
  // been used in the response, increasing the vocabulary.
  //
  // A negative penalty will encourage the use of tokens that have already been
  // used in the response, decreasing the vocabulary.
  optional float presence_penalty = 15 [(google.api.field_behavior) = OPTIONAL];

  // Optional. Frequency penalty applied to the next token's logprobs,
  // multiplied by the number of times each token has been seen in the respponse
  // so far.
  //
  // A positive penalty will discourage the use of tokens that have already
  // been used, proportional to the number of times the token has been used:
  // The more a token is used, the more difficult it is for the model to use
  // that token again increasing the vocabulary of responses.
  //
  // Caution: A _negative_ penalty will encourage the model to reuse tokens
  // proportional to the number of times the token has been used. Small
  // negative values will reduce the vocabulary of a response. Larger negative
  // values will cause the model to start repeating a common token  until it
  // hits the
  // [max_output_tokens][google.ai.generativelanguage.v1.GenerationConfig.max_output_tokens]
  // limit.
  optional float frequency_penalty = 16
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. If true, export the logprobs results in response.
  optional bool response_logprobs = 17 [(google.api.field_behavior) = OPTIONAL];

  // Optional. Only valid if
  // [response_logprobs=True][google.ai.generativelanguage.v1.GenerationConfig.response_logprobs].
  // This sets the number of top logprobs to return at each decoding step in the
  // [Candidate.logprobs_result][google.ai.generativelanguage.v1.Candidate.logprobs_result].
  optional int32 logprobs = 18 [(google.api.field_behavior) = OPTIONAL];

  // Optional. Enables enhanced civic answers. It may not be available for all
  // models.
  optional bool enable_enhanced_civic_answers = 19
      [(google.api.field_behavior) = OPTIONAL];
}

// Response from the model supporting multiple candidate responses.
//
// Safety ratings and content filtering are reported for both
// prompt in `GenerateContentResponse.prompt_feedback` and for each candidate
// in `finish_reason` and in `safety_ratings`. The API:
//  - Returns either all requested candidates or none of them
//  - Returns no candidates at all only if there was something wrong with the
//    prompt (check `prompt_feedback`)
//  - Reports feedback on each candidate in `finish_reason` and
//    `safety_ratings`.
message GenerateContentResponse {
  // A set of the feedback metadata the prompt specified in
  // `GenerateContentRequest.content`.
  message PromptFeedback {
    // Specifies the reason why the prompt was blocked.
    enum BlockReason {
      // Default value. This value is unused.
      BLOCK_REASON_UNSPECIFIED = 0;

      // Prompt was blocked due to safety reasons. Inspect `safety_ratings`
      // to understand which safety category blocked it.
      SAFETY = 1;

      // Prompt was blocked due to unknown reasons.
      OTHER = 2;

      // Prompt was blocked due to the terms which are included from the
      // terminology blocklist.
      BLOCKLIST = 3;

      // Prompt was blocked due to prohibited content.
      PROHIBITED_CONTENT = 4;

      // Candidates blocked due to unsafe image generation content.
      IMAGE_SAFETY = 5;
    }

    // Optional. If set, the prompt was blocked and no candidates are returned.
    // Rephrase the prompt.
    BlockReason block_reason = 1 [(google.api.field_behavior) = OPTIONAL];

    // Ratings for safety of the prompt.
    // There is at most one rating per category.
    repeated SafetyRating safety_ratings = 2;
  }

  // Metadata on the generation request's token usage.
  message UsageMetadata {
    // Number of tokens in the prompt. When `cached_content` is set, this is
    // still the total effective prompt size meaning this includes the number of
    // tokens in the cached content.
    int32 prompt_token_count = 1;

    // Total number of tokens across all the generated response candidates.
    int32 candidates_token_count = 2;

    // Output only. Number of tokens present in tool-use prompt(s).
    int32 tool_use_prompt_token_count = 8
        [(google.api.field_behavior) = OUTPUT_ONLY];

    // Output only. Number of tokens of thoughts for thinking models.
    int32 thoughts_token_count = 10 [(google.api.field_behavior) = OUTPUT_ONLY];

    // Total token count for the generation request (prompt + response
    // candidates).
    int32 total_token_count = 3;

    // Output only. List of modalities that were processed in the request input.
    repeated ModalityTokenCount prompt_tokens_details = 5
        [(google.api.field_behavior) = OUTPUT_ONLY];

    // Output only. List of modalities of the cached content in the request
    // input.
    repeated ModalityTokenCount cache_tokens_details = 6
        [(google.api.field_behavior) = OUTPUT_ONLY];

    // Output only. List of modalities that were returned in the response.
    repeated ModalityTokenCount candidates_tokens_details = 7
        [(google.api.field_behavior) = OUTPUT_ONLY];

    // Output only. List of modalities that were processed for tool-use request
    // inputs.
    repeated ModalityTokenCount tool_use_prompt_tokens_details = 9
        [(google.api.field_behavior) = OUTPUT_ONLY];
  }

  // Candidate responses from the model.
  repeated Candidate candidates = 1;

  // Returns the prompt's feedback related to the content filters.
  PromptFeedback prompt_feedback = 2;

  // Output only. Metadata on the generation requests' token usage.
  UsageMetadata usage_metadata = 3 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The model version used to generate the response.
  string model_version = 4 [(google.api.field_behavior) = OUTPUT_ONLY];
}

// A response candidate generated from the model.
message Candidate {
  // Defines the reason why the model stopped generating tokens.
  enum FinishReason {
    // Default value. This value is unused.
    FINISH_REASON_UNSPECIFIED = 0;

    // Natural stop point of the model or provided stop sequence.
    STOP = 1;

    // The maximum number of tokens as specified in the request was reached.
    MAX_TOKENS = 2;

    // The response candidate content was flagged for safety reasons.
    SAFETY = 3;

    // The response candidate content was flagged for recitation reasons.
    RECITATION = 4;

    // The response candidate content was flagged for using an unsupported
    // language.
    LANGUAGE = 6;

    // Unknown reason.
    OTHER = 5;

    // Token generation stopped because the content contains forbidden terms.
    BLOCKLIST = 7;

    // Token generation stopped for potentially containing prohibited content.
    PROHIBITED_CONTENT = 8;

    // Token generation stopped because the content potentially contains
    // Sensitive Personally Identifiable Information (SPII).
    SPII = 9;

    // The function call generated by the model is invalid.
    MALFORMED_FUNCTION_CALL = 10;

    // Token generation stopped because generated images contain safety
    // violations.
    IMAGE_SAFETY = 11;
  }

  // Output only. Index of the candidate in the list of response candidates.
  optional int32 index = 3 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. Generated content returned from the model.
  Content content = 1 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Optional. Output only. The reason why the model stopped generating tokens.
  //
  // If empty, the model has not stopped generating tokens.
  FinishReason finish_reason = 2 [
    (google.api.field_behavior) = OPTIONAL,
    (google.api.field_behavior) = OUTPUT_ONLY
  ];

  // List of ratings for the safety of a response candidate.
  //
  // There is at most one rating per category.
  repeated SafetyRating safety_ratings = 5;

  // Output only. Citation information for model-generated candidate.
  //
  // This field may be populated with recitation information for any text
  // included in the `content`. These are passages that are "recited" from
  // copyrighted material in the foundational LLM's training data.
  CitationMetadata citation_metadata = 6
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. Token count for this candidate.
  int32 token_count = 7 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. Grounding metadata for the candidate.
  //
  // This field is populated for `GenerateContent` calls.
  GroundingMetadata grounding_metadata = 9
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. Average log probability score of the candidate.
  double avg_logprobs = 10 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. Log-likelihood scores for the response tokens and top tokens
  LogprobsResult logprobs_result = 11
      [(google.api.field_behavior) = OUTPUT_ONLY];
}

// Logprobs Result
message LogprobsResult {
  // Candidate for the logprobs token and score.
  message Candidate {
    // The candidate’s token string value.
    optional string token = 1;

    // The candidate’s token id value.
    optional int32 token_id = 3;

    // The candidate's log probability.
    optional float log_probability = 2;
  }

  // Candidates with top log probabilities at each decoding step.
  message TopCandidates {
    // Sorted by log probability in descending order.
    repeated Candidate candidates = 1;
  }

  // Length = total number of decoding steps.
  repeated TopCandidates top_candidates = 1;

  // Length = total number of decoding steps.
  // The chosen candidates may or may not be in top_candidates.
  repeated Candidate chosen_candidates = 2;
}

// Metadata related to retrieval in the grounding flow.
message RetrievalMetadata {
  // Optional. Score indicating how likely information from google search could
  // help answer the prompt. The score is in the range [0, 1], where 0 is the
  // least likely and 1 is the most likely. This score is only populated when
  // google search grounding and dynamic retrieval is enabled. It will be
  // compared to the threshold to determine whether to trigger google search.
  float google_search_dynamic_retrieval_score = 2
      [(google.api.field_behavior) = OPTIONAL];
}

// Metadata returned to client when grounding is enabled.
message GroundingMetadata {
  // Optional. Google search entry for the following-up web searches.
  optional SearchEntryPoint search_entry_point = 1
      [(google.api.field_behavior) = OPTIONAL];

  // List of supporting references retrieved from specified grounding source.
  repeated GroundingChunk grounding_chunks = 2;

  // List of grounding support.
  repeated GroundingSupport grounding_supports = 3;

  // Metadata related to retrieval in the grounding flow.
  optional RetrievalMetadata retrieval_metadata = 4;

  // Web search queries for the following-up web search.
  repeated string web_search_queries = 5;
}

// Google search entry point.
message SearchEntryPoint {
  // Optional. Web content snippet that can be embedded in a web page or an app
  // webview.
  string rendered_content = 1 [(google.api.field_behavior) = OPTIONAL];

  // Optional. Base64 encoded JSON representing array of <search term, search
  // url> tuple.
  bytes sdk_blob = 2 [(google.api.field_behavior) = OPTIONAL];
}

// Grounding chunk.
message GroundingChunk {
  // Chunk from the web.
  message Web {
    // URI reference of the chunk.
    optional string uri = 1;

    // Title of the chunk.
    optional string title = 2;
  }

  // Chunk type.
  oneof chunk_type {
    // Grounding chunk from the web.
    Web web = 1;
  }
}

// Segment of the content.
message Segment {
  // Output only. The index of a Part object within its parent Content object.
  int32 part_index = 1 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. Start index in the given Part, measured in bytes. Offset from
  // the start of the Part, inclusive, starting at zero.
  int32 start_index = 2 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. End index in the given Part, measured in bytes. Offset from
  // the start of the Part, exclusive, starting at zero.
  int32 end_index = 3 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The text corresponding to the segment from the response.
  string text = 4 [(google.api.field_behavior) = OUTPUT_ONLY];
}

// Grounding support.
message GroundingSupport {
  // Segment of the content this support belongs to.
  optional Segment segment = 1;

  // A list of indices (into 'grounding_chunk') specifying the
  // citations associated with the claim. For instance [1,3,4] means
  // that grounding_chunk[1], grounding_chunk[3],
  // grounding_chunk[4] are the retrieved content attributed to the claim.
  repeated int32 grounding_chunk_indices = 2;

  // Confidence score of the support references. Ranges from 0 to 1. 1 is the
  // most confident. This list must have the same size as the
  // grounding_chunk_indices.
  repeated float confidence_scores = 3;
}

// Request containing the `Content` for the model to embed.
message EmbedContentRequest {
  // Required. The model's resource name. This serves as an ID for the Model to
  // use.
  //
  // This name should match a model name returned by the `ListModels` method.
  //
  // Format: `models/{model}`
  string model = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      type: "generativelanguage.googleapis.com/Model"
    }
  ];

  // Required. The content to embed. Only the `parts.text` fields will be
  // counted.
  Content content = 2 [(google.api.field_behavior) = REQUIRED];

  // Optional. Optional task type for which the embeddings will be used. Not
  // supported on earlier models (`models/embedding-001`).
  optional TaskType task_type = 3 [(google.api.field_behavior) = OPTIONAL];

  // Optional. An optional title for the text. Only applicable when TaskType is
  // `RETRIEVAL_DOCUMENT`.
  //
  // Note: Specifying a `title` for `RETRIEVAL_DOCUMENT` provides better quality
  // embeddings for retrieval.
  optional string title = 4 [(google.api.field_behavior) = OPTIONAL];

  // Optional. Optional reduced dimension for the output embedding. If set,
  // excessive values in the output embedding are truncated from the end.
  // Supported by newer models since 2024 only. You cannot set this value if
  // using the earlier model (`models/embedding-001`).
  optional int32 output_dimensionality = 5
      [(google.api.field_behavior) = OPTIONAL];
}

// A list of floats representing an embedding.
message ContentEmbedding {
  // The embedding values.
  repeated float values = 1;
}

// The response to an `EmbedContentRequest`.
message EmbedContentResponse {
  // Output only. The embedding generated from the input content.
  ContentEmbedding embedding = 1 [(google.api.field_behavior) = OUTPUT_ONLY];
}

// Batch request to get embeddings from the model for a list of prompts.
message BatchEmbedContentsRequest {
  // Required. The model's resource name. This serves as an ID for the Model to
  // use.
  //
  // This name should match a model name returned by the `ListModels` method.
  //
  // Format: `models/{model}`
  string model = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      type: "generativelanguage.googleapis.com/Model"
    }
  ];

  // Required. Embed requests for the batch. The model in each of these requests
  // must match the model specified `BatchEmbedContentsRequest.model`.
  repeated EmbedContentRequest requests = 2
      [(google.api.field_behavior) = REQUIRED];
}

// The response to a `BatchEmbedContentsRequest`.
message BatchEmbedContentsResponse {
  // Output only. The embeddings for each request, in the same order as provided
  // in the batch request.
  repeated ContentEmbedding embeddings = 1
      [(google.api.field_behavior) = OUTPUT_ONLY];
}

// Counts the number of tokens in the `prompt` sent to a model.
//
// Models may tokenize text differently, so each model may return a different
// `token_count`.
message CountTokensRequest {
  // Required. The model's resource name. This serves as an ID for the Model to
  // use.
  //
  // This name should match a model name returned by the `ListModels` method.
  //
  // Format: `models/{model}`
  string model = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      type: "generativelanguage.googleapis.com/Model"
    }
  ];

  // Optional. The input given to the model as a prompt. This field is ignored
  // when `generate_content_request` is set.
  repeated Content contents = 2 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The overall input given to the `Model`. This includes the prompt
  // as well as other model steering information like [system
  // instructions](https://ai.google.dev/gemini-api/docs/system-instructions),
  // and/or function declarations for [function
  // calling](https://ai.google.dev/gemini-api/docs/function-calling).
  // `Model`s/`Content`s and `generate_content_request`s are mutually
  // exclusive. You can either send `Model` + `Content`s or a
  // `generate_content_request`, but never both.
  GenerateContentRequest generate_content_request = 3
      [(google.api.field_behavior) = OPTIONAL];
}

// A response from `CountTokens`.
//
// It returns the model's `token_count` for the `prompt`.
message CountTokensResponse {
  // The number of tokens that the `Model` tokenizes the `prompt` into. Always
  // non-negative.
  int32 total_tokens = 1;

  // Output only. List of modalities that were processed in the request input.
  repeated ModalityTokenCount prompt_tokens_details = 6
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. List of modalities that were processed in the cached content.
  repeated ModalityTokenCount cache_tokens_details = 7
      [(google.api.field_behavior) = OUTPUT_ONLY];
}