Finding a mutually free time across several people's calendars still means manual toggling, syncing and endless back-and-forth — no assistant actually negotiates the slot

Summary

People coordinating across several calendars (partner, work, kids' practices, vendors, candidates) describe the real workflow as: open each person's calendar, toggle layers on and off, cross-check work vs. personal vs. external (Google/Outlook) calendars, then still send a message asking 'does Tuesday at 3 work?' and wait. Calendar apps are passive displays — they show availability but never resolve it. Booking-link tools (Calendly-style) are one-sided: they push the burden onto the other party, break down with groups of 3+ people who each have constraints, can't weigh trade-offs or preferences ('not before 9, not Fridays, partner drives kids on Wednesdays'), and don't work for privacy-conscious or self-hosted/de-Googled setups. The result is exactly the described misery: hours of email/chat ping-pong, re-explaining what is needed in every reply, chasing people across apps, and nothing feeling settled until everyone manually confirms. This is unsolved: no assistant ingests multiple people's calendars (including external and self-hosted ones), negotiates candidate times on the user's behalf across email/chat, respects recurring constraints and preferences, and returns a single confirmed decision for one-click approval. High pain, high frequency, and a clear willingness to pay among founders, operators, recruiters, EAs and family logistics coordinators — plus a natural fit for agent-to-agent/MCP-style negotiation where one assistant talks to another.