diff --git a/js/plugins/vertexai/src/evaluation/index.ts b/js/plugins/vertexai/src/evaluation/index.ts
index 799c777329..cba7193626 100644
--- a/js/plugins/vertexai/src/evaluation/index.ts
+++ b/js/plugins/vertexai/src/evaluation/index.ts
@@ -21,6 +21,7 @@ import { vertexEvaluators } from './evaluation.js';
 import { PluginOptions } from './types.js';
 export { VertexAIEvaluationMetricType } from './types.js';
 export { PluginOptions };
+
 /**
  * Add Google Cloud Vertex AI Rerankers API to Genkit.
  */
@@ -28,11 +29,6 @@ export function vertexAIEvaluation(options: PluginOptions): GenkitPlugin {
   return genkitPlugin('vertexAIEvaluation', async (ai: Genkit) => {
     const { projectId, location, authClient } = await getDerivedParams(options);
 
-    const metrics =
-      options?.evaluation && options.evaluation.metrics.length > 0
-        ? options.evaluation.metrics
-        : [];
-
-    vertexEvaluators(ai, authClient, metrics, projectId, location);
+    vertexEvaluators(ai, authClient, options.metrics, projectId, location);
   });
 }
diff --git a/js/plugins/vertexai/src/evaluation/types.ts b/js/plugins/vertexai/src/evaluation/types.ts
index 7ab48c0556..a5924bb08e 100644
--- a/js/plugins/vertexai/src/evaluation/types.ts
+++ b/js/plugins/vertexai/src/evaluation/types.ts
@@ -45,10 +45,7 @@ export type VertexAIEvaluationMetric =
 
 /** Options specific to evaluation configuration */
 export interface EvaluationOptions {
-  /** Configure Vertex AI evaluators */
-  evaluation?: {
-    metrics: VertexAIEvaluationMetric[];
-  };
+  metrics: VertexAIEvaluationMetric[];
 }
 
 export interface PluginOptions extends CommonPluginOptions, EvaluationOptions {}
diff --git a/js/plugins/vertexai/src/modelgarden/index.ts b/js/plugins/vertexai/src/modelgarden/index.ts
index 8acbe81d4d..52ac287bfe 100644
--- a/js/plugins/vertexai/src/modelgarden/index.ts
+++ b/js/plugins/vertexai/src/modelgarden/index.ts
@@ -23,6 +23,7 @@ import {
   modelGardenOpenaiCompatibleModel,
 } from './model_garden.js';
 import { PluginOptions } from './types.js';
+
 /**
  * Add Google Cloud Vertex AI Rerankers API to Genkit.
  */
@@ -30,8 +31,7 @@ export function vertexAIModelGarden(options: PluginOptions): GenkitPlugin {
   return genkitPlugin('vertexAIModelGarden', async (ai: Genkit) => {
     const { projectId, location, authClient } = await getDerivedParams(options);
 
-    const mgModels = options?.modelGardenModels || options?.modelGarden?.models;
-    mgModels!.forEach((m) => {
+    options.models.forEach((m) => {
       const anthropicEntry = Object.entries(SUPPORTED_ANTHROPIC_MODELS).find(
         ([_, value]) => value.name === m.name
       );
@@ -49,7 +49,7 @@ export function vertexAIModelGarden(options: PluginOptions): GenkitPlugin {
           projectId,
           location,
           authClient,
-          options.modelGarden?.openAiBaseUrlTemplate
+          options.openAiBaseUrlTemplate
         );
         return;
       }
diff --git a/js/plugins/vertexai/src/modelgarden/types.ts b/js/plugins/vertexai/src/modelgarden/types.ts
index d63dcca33a..b7748ad37d 100644
--- a/js/plugins/vertexai/src/modelgarden/types.ts
+++ b/js/plugins/vertexai/src/modelgarden/types.ts
@@ -17,34 +17,17 @@
 import { ModelReference } from 'genkit';
 import { CommonPluginOptions } from '../common/types.js';
 
-export enum VertexAIEvaluationMetricType {
-  // Update genkit/docs/plugins/vertex-ai.md when modifying the list of enums
-  BLEU = 'BLEU',
-  ROUGE = 'ROUGE',
-  FLUENCY = 'FLEUNCY',
-  SAFETY = 'SAFETY',
-  GROUNDEDNESS = 'GROUNDEDNESS',
-  SUMMARIZATION_QUALITY = 'SUMMARIZATION_QUALITY',
-  SUMMARIZATION_HELPFULNESS = 'SUMMARIZATION_HELPFULNESS',
-  SUMMARIZATION_VERBOSITY = 'SUMMARIZATION_VERBOSITY',
-}
-
 /**
  * Evaluation metric config. Use `metricSpec` to define the behavior of the metric.
  * The value of `metricSpec` will be included in the request to the API. See the API documentation
  * for details on the possible values of `metricSpec` for each metric.
  * https://cloud.google.com/vertex-ai/generative-ai/docs/model-reference/evaluation#parameter-list
  */
+
 /** Options specific to Model Garden configuration */
 export interface ModelGardenOptions {
-  /**
-   * @deprecated use `modelGarden.models`
-   */
-  modelGardenModels?: ModelReference<any>[];
-  modelGarden?: {
-    models: ModelReference<any>[];
-    openAiBaseUrlTemplate?: string;
-  };
+  models: ModelReference<any>[];
+  openAiBaseUrlTemplate?: string;
 }
 
 export interface PluginOptions
diff --git a/js/plugins/vertexai/src/rerankers/index.ts b/js/plugins/vertexai/src/rerankers/index.ts
index 33cd8cf52f..0a3b90b343 100644
--- a/js/plugins/vertexai/src/rerankers/index.ts
+++ b/js/plugins/vertexai/src/rerankers/index.ts
@@ -36,7 +36,9 @@ export function vertexAIRerankers(options: PluginOptions): GenkitPlugin {
       projectId,
       location,
       authClient,
-      rerankOptions: options.rerankOptions,
+      rerankOptions: options.rerankers.map((o) =>
+        typeof o === 'string' ? { model: o } : o
+      ),
     });
   });
 }
diff --git a/js/plugins/vertexai/src/rerankers/reranker.ts b/js/plugins/vertexai/src/rerankers/reranker.ts
index cc807cb75e..f09e20d59d 100644
--- a/js/plugins/vertexai/src/rerankers/reranker.ts
+++ b/js/plugins/vertexai/src/rerankers/reranker.ts
@@ -34,7 +34,7 @@ export async function vertexAiRerankers(
   const rerankOptions = options.rerankOptions;
 
   if (rerankOptions.length === 0) {
-    return;
+    throw new Error('Provide at least one reranker configuration.');
   }
 
   const auth = options.authClient;
@@ -42,6 +42,9 @@ export async function vertexAiRerankers(
   const projectId = options.projectId;
 
   for (const rerankOption of rerankOptions) {
+    if (!rerankOption.name && !rerankOption.model) {
+      throw new Error('At least one of name or model must be provided.');
+    }
     ai.defineReranker(
       {
         name: `vertexai/${rerankOption.name || rerankOption.model}`,
diff --git a/js/plugins/vertexai/src/rerankers/types.ts b/js/plugins/vertexai/src/rerankers/types.ts
index 4f5b00d5f6..e5b8a34b48 100644
--- a/js/plugins/vertexai/src/rerankers/types.ts
+++ b/js/plugins/vertexai/src/rerankers/types.ts
@@ -33,13 +33,12 @@ export type VertexAIRerankerOptions = z.infer<
   typeof VertexAIRerankerOptionsSchema
 >;
 
-// Define the structure for each individual reranker configuration
-export const VertexRerankerConfigSchema = z.object({
-  name: z.string().optional().describe('Name of the reranker'), // Optional: Name of the reranker
-  model: z.string().optional().describe('Model name for reranking'), // Optional: Model name, defaults to a pre-defined model
-});
-
-export type VertexRerankerConfig = z.infer<typeof VertexRerankerConfigSchema>;
+export interface VertexRerankerConfig {
+  // Optional: Name of the reranker
+  name?: string;
+  // Optional: Model name, defaults to a pre-defined model
+  model?: string;
+}
 
 export interface VertexRerankOptions {
   authClient: GoogleAuth;
@@ -50,7 +49,7 @@ export interface VertexRerankOptions {
 
 export interface RerankerOptions {
   /** Configure reranker options */
-  rerankOptions: VertexRerankerConfig[];
+  rerankers: (string | VertexRerankerConfig)[];
 }
 
 export interface PluginOptions extends CommonPluginOptions, RerankerOptions {}
diff --git a/js/testapps/anthropic-models/src/index.ts b/js/testapps/anthropic-models/src/index.ts
index 2c5bb8582c..b14d505363 100644
--- a/js/testapps/anthropic-models/src/index.ts
+++ b/js/testapps/anthropic-models/src/index.ts
@@ -37,9 +37,7 @@ const ai = genkit({
     }),
     vertexAIModelGarden({
       location: 'europe-west1',
-      modelGarden: {
-        models: [claude35Sonnet],
-      },
+      models: [claude35Sonnet],
     }),
   ],
 });
diff --git a/js/testapps/dev-ui-gallery/src/genkit.ts b/js/testapps/dev-ui-gallery/src/genkit.ts
index e22fc439fa..56ae4ab922 100644
--- a/js/testapps/dev-ui-gallery/src/genkit.ts
+++ b/js/testapps/dev-ui-gallery/src/genkit.ts
@@ -78,27 +78,23 @@ export const ai = genkit({
     }),
     vertexAIModelGarden({
       location: 'us-central1',
-      modelGarden: {
-        models: [claude35Sonnet],
-      },
+      models: [claude35Sonnet],
     }),
     vertexAIEvaluation({
       location: 'us-central1',
-      evaluation: {
-        metrics: [
-          VertexAIEvaluationMetricType.BLEU,
-          VertexAIEvaluationMetricType.GROUNDEDNESS,
-          VertexAIEvaluationMetricType.SAFETY,
-          {
-            type: VertexAIEvaluationMetricType.ROUGE,
-            metricSpec: {
-              rougeType: 'rougeLsum',
-              useStemmer: true,
-              splitSummaries: 'true',
-            },
+      metrics: [
+        VertexAIEvaluationMetricType.BLEU,
+        VertexAIEvaluationMetricType.GROUNDEDNESS,
+        VertexAIEvaluationMetricType.SAFETY,
+        {
+          type: VertexAIEvaluationMetricType.ROUGE,
+          metricSpec: {
+            rougeType: 'rougeLsum',
+            useStemmer: true,
+            splitSummaries: 'true',
           },
-        ],
-      },
+        },
+      ],
     }),
 
     // vector stores
diff --git a/js/testapps/format-tester/src/index.ts b/js/testapps/format-tester/src/index.ts
index 857487e385..195b914692 100644
--- a/js/testapps/format-tester/src/index.ts
+++ b/js/testapps/format-tester/src/index.ts
@@ -34,7 +34,7 @@ const ai = genkit({
     }),
     vertexAIModelGarden({
       location: 'us-east5',
-      modelGarden: { models: [claude35Sonnet, claude35SonnetV2] },
+      models: [claude35Sonnet, claude35SonnetV2],
     }),
   ],
 });
diff --git a/js/testapps/model-tester/src/index.ts b/js/testapps/model-tester/src/index.ts
index 7c1fe1fcbf..46a1e18cf0 100644
--- a/js/testapps/model-tester/src/index.ts
+++ b/js/testapps/model-tester/src/index.ts
@@ -35,9 +35,7 @@ export const ai = genkit({
     }),
     vertexAIModelGarden({
       location: 'us-central1',
-      modelGarden: {
-        models: [claude3Sonnet, llama31],
-      },
+      models: [claude3Sonnet, llama31],
     }),
     ollama({
       models: [
diff --git a/js/testapps/rag/src/genkit.ts b/js/testapps/rag/src/genkit.ts
index b8436f752c..13fad83b2e 100644
--- a/js/testapps/rag/src/genkit.ts
+++ b/js/testapps/rag/src/genkit.ts
@@ -79,9 +79,7 @@ export const ai = genkit({
     }),
     vertexAIModelGarden({
       location: 'us-central1',
-      modelGarden: {
-        models: [claude3Sonnet, llama31],
-      },
+      models: [claude3Sonnet, llama31],
     }),
     pinecone([
       {
diff --git a/js/testapps/vertexai-reranker/src/index.ts b/js/testapps/vertexai-reranker/src/index.ts
index 5ed30acaa6..60278fef8b 100644
--- a/js/testapps/vertexai-reranker/src/index.ts
+++ b/js/testapps/vertexai-reranker/src/index.ts
@@ -35,11 +35,7 @@ const ai = genkit({
     vertexAIRerankers({
       projectId: PROJECT_ID,
       location: LOCATION,
-      rerankOptions: [
-        {
-          model: 'vertexai/reranker',
-        },
-      ],
+      rerankers: ['vertexai/reranker'],
     }),
   ],
 });