undo py changes

Author: ssbushi

genkit-tools/common/src/types/model.ts

@@ -372,7 +372,7 @@ export const GenerateActionOutputConfig = z.object({
 
 export const GenerateActionOptionsSchema = z.object({
   /** A model name (e.g. `vertexai/gemini-1.0-pro`). */
-  model: z.string(),
+  model: z.string().optional(),
   /** Retrieved documents to be used as context for this generation. */
   docs: z.array(DocumentDataSchema).optional(),
   /** Conversation history for multi-turn prompting when supported by the underlying model. */

genkit-tools/genkit-schema.json

@@ -469,7 +469,6 @@
         }
       },
       "required": [
-        "model",
         "messages"
       ],
       "additionalProperties": false