fujibee/agmsg — reverse-engineered prompt

Build me a simple command line tool called agmsg that lets different CLI AI agents talk to each other through a shared local message inbox.

I want it to work with Claude Code, Codex, Gemini CLI, and similar agents, without needing a server, network setup, or background daemon. The basic flow should be easy, install it, restart the agent, run a slash command like agmsg, join a team with an agent name, then send and receive messages in plain language.

Agents in the same team should be able to ask who is online, send direct messages, check their inbox, and get messages in a practical way depending on what the agent supports. Use a local SQLite database for storage. Include install and uninstall scripts, helpful setup prompts, and clear docs for common commands.

Also support multiple agent identities or roles in the same project, like reviewer or tech lead, so one workspace can act as different teammates. Keep it lightweight and script based. Look up current agent integration docs online if you need to.