update code execution instance

Author: VinayGuthal

firebase-ai/CHANGELOG.md

@@ -13,7 +13,8 @@
   model's internal reasoning process.
 - [fixed] Fixed an issue causing the accessor methods in `GenerateContentResponse` to throw an
   exception when the response contained no candidates.
-- [changed] Added better description for requests which fail due to the Gemini API not being configured.
+- [changed] Added better description for requests which fail due to the Gemini API not being
+  configured.
 
 * [changed] Added a `dilation` parameter to `ImagenMaskReference.generateMaskAndPadForOutpainting`
   (#7260)

firebase-ai/src/main/kotlin/com/google/firebase/ai/type/Tool.kt

@@ -44,6 +44,8 @@ internal constructor(
   )
   public companion object {
 
+    private val codeExecutionInstance = Tool(null, null, JsonObject(emptyMap()))
+
     /**
      * Creates a [Tool] instance that provides the model with access to the [functionDeclarations].
      *
@@ -57,7 +59,7 @@ internal constructor(
     /** Creates a [Tool] instance that allows the model to use Code Execution. */
     @JvmStatic
     public fun codeExecution(): Tool {
-      return Tool(null, null, JsonObject(emptyMap()))
+      return codeExecutionInstance
     }
 
     /**