chore: Add default system prompt

Author: tjtanjin

config/env/.env.template

@@ -20,6 +20,7 @@ GEMINI_EMBEDDING_MODEL="text-embedding-004"
 GEMINI_CHAT_MODEL="gemini-2.0-flash-lite"
 GEMINI_RAG_TYPE="advanced" # basic (no RAG) or advanced (RAG)
 GEMINI_N_RESULTS="5" # number of results to use (only used for "advanced" rag type)
+GEMINI_SYSTEM_PROMPT="You are a helpful assistant for React ChatBotify, a React library for building flexible and extensible chatbots."
 
 # ChromaDB Configuration
 CHROMA_URL="http://chromadb"

src/config.ts

@@ -32,6 +32,10 @@ export const config = {
 
   geminiRagType: process.env.GEMINI_RAG_TYPE || 'basic',
 
+  geminiSystemPrompt:
+    process.env.GEMINI_SYSTEM_PROMPT ||
+    'You are a helpful assistant for React ChatBotify, a React library for building flexible and extensible chatbots.',
+
   // Server Configuration
   port: process.env.PORT || 8080,
 

src/services/llmWrapper.ts

@@ -35,7 +35,14 @@ export const generateText = async (
 
   try {
     const geminiModelId = model || config.geminiChatModel || 'gemini-pro';
-    const geminiContents: GeminiContent[] = [{ parts: [{ text: query }], role: 'user' }];
+    let geminiContents: GeminiContent[];
+
+    if (config.geminiSystemPrompt && config.geminiSystemPrompt.trim() !== '') {
+      geminiContents = [{ parts: [{ text: config.geminiSystemPrompt }], role: 'user' }];
+      geminiContents.push({ parts: [{ text: query }], role: 'user' });
+    } else {
+      geminiContents = [{ parts: [{ text: query }], role: 'user' }];
+    }
 
     if (stream) {
       if (!onChunk) {