imsg reads the macOS Messages SQLite database directly and drives Messages.app via AppleScript, exposing read, watch, and send operations through stable JSON and JSON-RPC interfaces. It streams new messages via filesystem events, resolves contacts, and handles attachments. A dedicated imsg completions llm command provides in-context CLI help for large language models, and the JSON-RPC surface over stdio is designed specifically for agent integrations and long-running workflows.