Mosaic
by Dorsa Rohani (ex-NVIDIA ML engineer) and Shubham Patil (ex-Beem founding engineer)
Defining the frontier of multiplayer AI.
See https://www.mosaic.dev · Y Combinator profile
What it is
A platform that synchronizes AI coding-agent sessions (Claude Code, Codex, Cursor, etc.)
into one shared workspace, so a team’s agent sessions have continuity instead of each one
starting from zero with no memory of what happened last session, why a decision was made,
or where the last person stopped.
Core design choice
Mosaic explicitly rejects the common multi-agent pattern of specialized agents passing
messages to each other (mimicking an org chart). Its philosophy: one shared context
store every agent reads from and writes to, rather than siloed agent-to-agent
messaging — the same “shared session memory” principle behind Multiplayer AI
generally.
Traction
~2,000 users across 37 organizations (as of research date, Sept 2026).
See also
- Multiplayer AI — the category Mosaic frames its pitch around
- Atomic (Bastani) — another coding-agent workflow layer, different approach (deterministic stages/gates vs. shared context store)