Voice-Agent

Architecture:

🎤 User (voice)
  ↓ (Speech-to-Text, e.g., Whisper)

📝 Text Query
  ↓
🤖 LangChain Agent (LLM + Tools)
  - Google Calendar Tool
  - Gmail Tool
  - SQL/NoSQL Database Tool
  - File Search Tool
  - Custom APIs
  ↓
📝 Text Response
  ↓ (Text-to-Speech, e.g., OpenAI TTS / ElevenLabs)

🔊 Spoken Output

Example Flow:

User (voice): "Schedule a meeting with Naveen tomorrow at 10 AM and send him an email confirmation."

• Whisper → converts to text.
• LangChain Agent → interprets the intent.
• Calls Google Calendar Tool to create the event.
• Calls Gmail Tool to send confirmation.
• LLM → generates a spoken confirmation: "I’ve scheduled the meeting and sent Rahul an email."
• TTS → speaks back.

Stack Flow:

Frontend
🎤 User voice → (STT: Whisper.js / Web Speech API / Vosk WASM / AssemblyAI SDK)
   ↓
📝 Text query → Sent to Backend

Backend
🤖 LangChain Agent (LLM + Tools: Calendar, Gmail, DB, APIs, File Search)
   ↓
📝 Text response → Sent back to Frontend

Frontend
↓
(Text-to-Speech: OpenAI TTS / ElevenLabs / Browser SpeechSynthesis API)
🔊 Spoken Output