Persona Chat (FastAPI + Minimal Frontend)

This adds a small FastAPI backend exposing your persona CoT flow and a minimal web UI that visualizes steps similar to your screenshot.

Prerequisites

• Python 3.11+ (you have 3.13 in venv)
• GOOGLE_API_KEY in a .env file at repo root

GOOGLE_API_KEY=your_key_here

Install

# With your venv activated
pip install -r requirements.txt

Run the API

python -m uvicorn api.main:app --reload --port 8000

• Health: http://localhost:8000/healthz
• Chat (batch): POST http://localhost:8000/api/chat {"query":"..."}
• Chat (stream): POST http://localhost:8000/api/chat/stream {"query":"..."}

Try the frontend

Just open frontend/index.html in your browser. It calls http://localhost:8000.

If your browser blocks mixed content or CORS, ensure the API is running on localhost:8000 (we enabled permissive CORS).

How it works

• persona/engine.py contains a PersonaEngine that:
  • Enforces strict JSON steps: analyse → think → output → validate → result
  • Limits repeated content and think streaks
  • Provides a generator to stream steps
• api/main.py wraps the engine into synchronous and streaming endpoints
• frontend/index.html is a small static UI that renders each step card

Deploy hints

• Backend: Docker + Render/Cloud Run/Fly.io
• Frontend: Vercel/Netlify or any static host; set API URL env and enable HTTPS

Security

• Keep GOOGLE_API_KEY server-side only; the static frontend talks to your API.