Hey PH, I built Crossagent in 3 days because I was tired of being my own copy-paste middleware between AI tabs. The core idea: type @claude inside ChatGPT, and Claude responds in a sidebar using your own account. No API key. No proxy. Completely native. Type @all, ChatGPT, Claude, Gemini, Perplexity, Grok, Mistral, and Copilot all answer at once, then Claude synthesises. Would love brutal feedback on what's broken, what's missing, and what would make you actually use this daily.