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TradingAgents Chainlit Web UI — Design

Summary

Add a Chainlit web UI to TradingAgents so it can be deployed on Railway as a web service. Users interact via chat messages (e.g., "Analyze NVDA") and see live agent progress streamed into the browser.

Architecture

Thin Chainlit wrapper around the existing TradingAgentsGraph programmatic API. ~150 lines of new code in a single app.py.

Components

`app.py` (Chainlit entry point)

@cl.on_chat_start — Welcome message explaining usage (e.g., "Type a ticker like NVDA or Analyze AAPL 2024-12-01")
@cl.on_message — Parse ticker + optional date from user message, create TradingAgentsGraph with Anthropic config, run propagate() in debug mode, stream Chainlit Step messages for each agent phase, send final decision as formatted message

`Dockerfile`

Python 3.13-slim base
Install requirements.txt
Expose $PORT
CMD: chainlit run app.py --host 0.0.0.0 --port $PORT

`railway.toml`

Build from Dockerfile
Health check on /

Railway Environment Variables

ANTHROPIC_API_KEY — required, for Claude models
PORT — auto-set by Railway

LLM Configuration

Provider: anthropic
Quick-think model: claude-haiku-4-5-20251001
Deep-think model: claude-sonnet-4-5-20241022
Data vendor: yfinance (no extra API keys needed)

Data Flow

User message: "Analyze NVDA"
  -> Parse: ticker=NVDA, date=today
  -> TradingAgentsGraph(config={anthropic, haiku/sonnet})
  -> graph.propagate("NVDA", "2026-02-20")
     -> Debug stream chunks
     -> Each chunk -> Chainlit Step (Analyst, Research, Trading, Risk, Portfolio)
  -> Final decision -> formatted Chainlit message with markdown

Message Parsing

Simple regex/string parsing:

"NVDA" -> ticker=NVDA, date=today
"Analyze AAPL 2024-12-01" -> ticker=AAPL, date=2024-12-01
"What's the outlook for TSLA?" -> ticker=TSLA, date=today
Extract uppercase 1-5 letter words as potential tickers

Deployment

Push changes to github.com/dtarkent2-sys/TradingAgents main branch
Create Railway service from GitHub repo
Set ANTHROPIC_API_KEY env var
Railway auto-deploys, Chainlit serves on assigned PORT

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