virattt/dexter

Dexter 🤖

Dexter is an autonomous financial research agent that thinks, plans, and learns as it works. It performs analysis using task planning, self-reflection, and real-time market data. Think Claude Code, but built specifically for financial research.

👋 Overview
✅ Prerequisites
💻 How to Install
🚀 How to Run
📊 How to Evaluate
🐛 How to Debug
📱 How to Use with WhatsApp
🤝 How to Contribute
📄 License

👋 Overview

Dexter takes complex financial questions and turns them into clear, step-by-step research plans. It runs those tasks using live market data, checks its own work, and refines the results until it has a confident, data-backed answer.

Key Capabilities:

Intelligent Task Planning: Automatically decomposes complex queries into structured research steps
Autonomous Execution: Selects and executes the right tools to gather financial data
Self-Validation: Checks its own work and iterates until tasks are complete
Real-Time Financial Data: Access to income statements, balance sheets, and cash flow statements
Safety Features: Built-in loop detection and step limits to prevent runaway execution

✅ Prerequisites

Bun runtime (v1.0 or higher)
OpenAI API key (get here)
Financial Datasets API key (get here)
Exa API key (get here) - optional, for web search

Installing Bun

If you don’t have Bun installed, you can install it using curl:

macOS/Linux:

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curl -fsSL https://bun.com/install | bash

Windows:

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powershell -c "irm bun.sh/install.ps1|iex"

After installation, restart your terminal and verify Bun is installed:

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bun --version

💻 How to Install

Clone the repository:

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git clone https://github.com/virattt/dexter.git
cd dexter

Install dependencies with Bun:

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bun install

Set up your environment variables:

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# Copy the example environment file
cp env.example .env

# Edit .env and add your API keys (if using cloud providers)
# OPENAI_API_KEY=your-openai-api-key
# ANTHROPIC_API_KEY=your-anthropic-api-key (optional)
# GOOGLE_API_KEY=your-google-api-key (optional)
# XAI_API_KEY=your-xai-api-key (optional)
# OPENROUTER_API_KEY=your-openrouter-api-key (optional)

# Institutional-grade market data for agents; AAPL, NVDA, MSFT are free
# FINANCIAL_DATASETS_API_KEY=your-financial-datasets-api-key

# (Optional) If using Ollama locally
# OLLAMA_BASE_URL=http://127.0.0.1:11434

# Web Search (Exa preferred, Tavily fallback)
# EXASEARCH_API_KEY=your-exa-api-key
# TAVILY_API_KEY=your-tavily-api-key

🚀 How to Run

Run Dexter in interactive mode:

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bun start

Or with watch mode for development:

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bun dev

📊 How to Evaluate

Dexter includes an evaluation suite that tests the agent against a dataset of financial questions. Evals use LangSmith for tracking and an LLM-as-judge approach for scoring correctness.

Run on all questions:

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bun run src/evals/run.ts

Run on a random sample of data:

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bun run src/evals/run.ts --sample 10

The eval runner displays a real-time UI showing progress, current question, and running accuracy statistics. Results are logged to LangSmith for analysis.

🐛 How to Debug

Dexter logs all tool calls to a scratchpad file for debugging and history tracking. Each query creates a new JSONL file in .dexter/scratchpad/.

Scratchpad location:

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.dexter/scratchpad/
├── 2026-01-30-111400_9a8f10723f79.jsonl
├── 2026-01-30-143022_a1b2c3d4e5f6.jsonl
└── ...

Each file contains newline-delimited JSON entries tracking:

init: The original query
tool_result: Each tool call with arguments, raw result, and LLM summary
thinking: Agent reasoning steps

Example scratchpad entry:

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{"type":"tool_result","timestamp":"2026-01-30T11:14:05.123Z","toolName":"get_income_statements","args":{"ticker":"AAPL","period":"annual","limit":5},"result":{...},"llmSummary":"Retrieved 5 years of Apple annual income statements showing revenue growth from $274B to $394B"}

This makes it easy to inspect exactly what data the agent gathered and how it interpreted results.

📱 How to Use with WhatsApp

Chat with Dexter through WhatsApp by linking your phone to the gateway. Messages you send to yourself are processed by Dexter and responses are sent back to the same chat.

Quick start:

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# Link your WhatsApp account (scan QR code)
bun run gateway:login

# Start the gateway
bun run gateway

Then open WhatsApp, go to your own chat (message yourself), and ask Dexter a question.

For detailed setup instructions, configuration options, and troubleshooting, see the WhatsApp Gateway README.

🤝 How to Contribute

Fork the repository
Create a feature branch
Commit your changes
Push to the branch
Create a Pull Request

Important: Please keep your pull requests small and focused. This will make it easier to review and merge.

📄 License

This project is licensed under the MIT License.