diff --git a/x-pack/plugins/elastic_assistant/server/lib/langchain/graphs/default_assistant_graph/nodes/translations.ts b/x-pack/plugins/elastic_assistant/server/lib/langchain/graphs/default_assistant_graph/nodes/translations.ts
index a0ae72ea2083c..8d6566ab2e782 100644
--- a/x-pack/plugins/elastic_assistant/server/lib/langchain/graphs/default_assistant_graph/nodes/translations.ts
+++ b/x-pack/plugins/elastic_assistant/server/lib/langchain/graphs/default_assistant_graph/nodes/translations.ts
@@ -16,4 +16,6 @@ export const GEMINI_SYSTEM_PROMPT =
   "The final response is the only output the user sees and should be a complete answer to the user's question. Do not leave out important tool output. The final response should never be empty. Don't forget to use tools.";
 export const BEDROCK_SYSTEM_PROMPT = `Use tools as often as possible, as they have access to the latest data and syntax. Always return value from ESQLKnowledgeBaseTool as is. Never return <thinking> tags in the response, but make sure to include <result> tags content in the response. Do not reflect on the quality of the returned search results in your response.`;
 
-export const VERTEX_SYSTEM_PROMPT = `ALWAYS use the provided tools, as they have access to the latest data and syntax.`;
+export const VERTEX_SYSTEM_PROMPT =
+  `ALWAYS use the provided tools, as they have access to the latest data and syntax.` +
+  "Do not alter the tool response. The final response will be the only output the user sees and should be a complete answer to the user's question, as if you were responding to the user's initial question.";
diff --git a/x-pack/plugins/elastic_assistant/server/lib/langchain/graphs/default_assistant_graph/prompts.ts b/x-pack/plugins/elastic_assistant/server/lib/langchain/graphs/default_assistant_graph/prompts.ts
index eb52c227421fc..0e05cdb31c551 100644
--- a/x-pack/plugins/elastic_assistant/server/lib/langchain/graphs/default_assistant_graph/prompts.ts
+++ b/x-pack/plugins/elastic_assistant/server/lib/langchain/graphs/default_assistant_graph/prompts.ts
@@ -9,7 +9,7 @@ import { ChatPromptTemplate } from '@langchain/core/prompts';
 import {
   BEDROCK_SYSTEM_PROMPT,
   DEFAULT_SYSTEM_PROMPT,
-  GEMINI_SYSTEM_PROMPT,
+  VERTEX_SYSTEM_PROMPT,
 } from './nodes/translations';
 
 export const formatPrompt = (prompt: string, additionalPrompt?: string) =>
@@ -23,7 +23,7 @@ export const formatPrompt = (prompt: string, additionalPrompt?: string) =>
 export const systemPrompts = {
   openai: DEFAULT_SYSTEM_PROMPT,
   bedrock: `${DEFAULT_SYSTEM_PROMPT} ${BEDROCK_SYSTEM_PROMPT}`,
-  gemini: `${DEFAULT_SYSTEM_PROMPT} ${GEMINI_SYSTEM_PROMPT}`,
+  gemini: `${DEFAULT_SYSTEM_PROMPT} ${VERTEX_SYSTEM_PROMPT}`,
   structuredChat: `Respond to the human as helpfully and accurately as possible. You have access to the following tools:
 
 {tools}