public Builder clearParameters() {
      bitField0_ = (bitField0_ & ~0x00000004);
      parameters_ = null;
      if (parametersBuilder_ != null) {
        parametersBuilder_.dispose();
        parametersBuilder_ = null;
      }
      onChanged();
      return this;
    }
<pre>
Optional. Describes the parameters to this function in JSON Schema Object
format. Reflects the Open API 3.03 Parameter Object. string Key: the name
of the parameter. Parameter names are case sensitive. Schema Value: the
Schema defining the type used for the parameter. For function with no
parameters, this can be left unset. Parameter names must start with a
letter or an underscore and must only contain chars a-z, A-Z, 0-9, or
underscores with a maximum length of 64. Example with 1 required and 1
optional parameter: type: OBJECT properties:
 param1:
   type: STRING
 param2:
   type: INTEGER
required:
 - param1
</pre>

<code>
.google.cloud.vertexai.v1.Schema parameters = 3 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/FunctionDeclaration.java