agmsg

agmsg is a lightweight, vendor-agnostic messaging tool designed to facilitate seamless communication between multiple AI coding agents such as Claude Code, Codex, Gemini CLI, and Copilot CLI. Unlike traditional methods that rely on copy-pasting or ephemeral subagents, agmsg uses a shared SQLite database to enable persistent, direct messaging without the need for daemons, network configurations, or Python scripting. Its minimalist approach leverages simple bash and sqlite3 commands, making it accessible and easy to deploy as an Agent Skill. This unique setup allows developers to run several AI agents—potentially multiple instances of Claude Code—working together within a single environment, fostering collaborative and efficient AI-driven coding workflows. Its open-source nature and vendor-neutral design make it appealing for developers seeking flexible, persistent multi-agent interactions without vendor lock-in or complex infrastructure.