public Builder clearPromptTokenCount() {
        bitField0_ = (bitField0_ & ~0x00000001);
        promptTokenCount_ = 0;
        onChanged();
        return this;
      }
<pre>
Number of tokens in the request. When `cached_content` is set, this is
still the total effective prompt size meaning this includes the number of
tokens in the cached content.
</pre>

<code>int32 prompt_token_count = 1;</code>

@return This builder for chaining.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/GenerateContentResponse.java