add SystemInstruction as a param to GenerativeModel and wire it throu… (

#112)

…gh common

Co-authored-by: David Motsonashvili <davidmotson@google.com>
Co-authored-by: Rodrigo Lazo <rlazo@users.noreply.github.com>

common/src/main/kotlin/com/google/ai/client/generativeai/common/Request.kt

@@ -35,6 +35,7 @@ data class GenerateContentRequest(
   @SerialName("generation_config") val generationConfig: GenerationConfig? = null,
   val tools: List<Tool>? = null,
   @SerialName("tool_config") var toolConfig: ToolConfig? = null,
+  @SerialName("system_instruction") val systemInstruction: Content? = null,
 ) : Request
 
 @Serializable

generativeai/src/main/java/com/google/ai/client/generativeai/GenerativeModel.kt

@@ -58,6 +58,7 @@ import org.json.JSONObject
  * @property generationConfig configuration parameters to use for content generation
  * @property safetySettings the safety bounds to use during alongside prompts during content
  *   generation
+ * @property systemInstruction contains a [Content] that directs the model to behave a certain way
  * @property requestOptions configuration options to utilize during backend communication
  */
 @OptIn(ExperimentalSerializationApi::class)
@@ -69,6 +70,7 @@ internal constructor(
   val safetySettings: List<SafetySetting>? = null,
   val tools: List<Tool>? = null,
   val toolConfig: ToolConfig? = null,
+  val systemInstruction: Content? = null,
   val requestOptions: RequestOptions = RequestOptions(),
   private val controller: APIController,
 ) {
@@ -81,6 +83,7 @@ internal constructor(
     safetySettings: List<SafetySetting>? = null,
     tools: List<Tool>? = null,
     toolConfig: ToolConfig? = null,
+    systemInstruction: Content? = null,
     requestOptions: RequestOptions = RequestOptions(),
   ) : this(
     modelName,
@@ -89,12 +92,13 @@ internal constructor(
     safetySettings,
     tools,
     toolConfig,
+    systemInstruction?.let { Content("system", it.parts) },
     requestOptions,
     APIController(
       apiKey,
       modelName,
       requestOptions.toInternal(),
-      "genai-android/${BuildConfig.VERSION_NAME}"
+      "genai-android/${BuildConfig.VERSION_NAME}",
     ),
   )
 
@@ -235,6 +239,7 @@ internal constructor(
       generationConfig?.toInternal(),
       tools?.map { it.toInternal() },
       toolConfig?.toInternal(),
+      systemInstruction?.toInternal(),
     )
 
   private fun constructCountTokensRequest(vararg prompt: Content) =