Descript is built around a transcription-first editing paradigm: media is ingested, auto-transcribed with high accuracy, and then manipulated via a text layer that stays in sync with the audio/video timeline. The platform exposes an API and MCP (Model Context Protocol) integration, allowing developers to programmatically edit video or invoke Descript's capabilities from within AI assistants. Core AI subsystems include Regenerate (voice cloning for mouth-movement-accurate speech replacement), Studio Sound (generative audio restoration), Eye Contact correction, Green Screen background removal, and Underlord — an agentic AI co-editor that can script, design, and assemble full videos from a prompt. AI credits gate generative features, while media hours control storage/export capacity.