Sigma Code is an open-source AI coding agent designed for managing long coding tasks without losing state. It operates within a native sandbox to ensure commands remain isolated, providing a safe environment for execution. With its durable sessions feature, users can resume, replay, or audit their work even after process interruptions. The application supports both a desktop client and command-line interfaces, allowing flexibility for different workflows. Additionally, Sigma Code utilizes evidence-backed completion, meaning tasks cannot be marked as complete without proper validation and review, ensuring quality and reliability in coding practices.

The program is available for free and supports multiple platforms, including stable releases for Linux and unsigned previews for Windows. Users can connect to various model providers and utilize features such as LSP-backed code intelligence and explicit MCP server connections. Comprehensive documentation is available to guide users through setup, configuration, and usage, making it accessible for developers looking to enhance their coding efficiency with AI assistance.