How I Got 9 AI Agents to Work Together Across 3 Different IDEs

I run 9 AI agents on a Mac mini - Claude Code, Gemini, GPT, Kimi, and others - each in their own IDE or terminal session. Getting them to actually coordinate was the hard part. The problem Agent Teams in Claude Code works great when all your agents are Claude. But my setup is mixed: some agents run through OpenClaw, some through Cursor, one through Codex CLI. The built-in team messaging doesn't work across providers, and the tmux-based coordination breaks down once you go headless or run in CI. I kept hitting the same issues: Messages silently dropped when agent names didn't match exactly Plan files getting overwritten when multiple sessions shared a directory No way to join an existing session into a team without restarting it Windows and headless environments couldn't use the tmux coordination layer at all What I built IDE Agent Kit is a lightweight coordination layer that works across different IDE agents. The core idea is simple: agents communicate through a filesystem-based messag