Dexter is a CLI-based AI agent framework specifically designed for deep financial research. It implements a sophisticated agent loop that combines task planning, autonomous tool execution, and self-validation to answer complex financial queries. The system features a modular architecture with specialized systems for memory management, tool execution, permissions, and skills. Key capabilities include access to real-time financial data through multiple APIs, web search functionality, file system operations, browser automation, and specialized workflows like DCF valuation. The agent maintains persistent memory across sessions using vector embeddings and keyword search with temporal decay weighting. Dexter can be deployed via CLI or as a WhatsApp bot, and includes an evaluation framework for testing agent performance against financial questions. The system emphasizes security through a robust permission system that controls access to potentially dangerous operations like shell commands.