Developer tool that centralizes coding-agent sessions so teams and agents can retain shared cross-session context and handoffs.
Product sources: Mosaic official site + Y Combinator S26 company page
Mosaic is a shared persistent workspace for people and AI coding agents. Its current product surface combines real-time shared terminals, persistent sessions, pair programming with agents, routing among multiple agents and cross-device handoffs. A local background service can also synchronize supported coding-agent sessions into a team-accessible local replica so another teammate or agent can inspect and continue prior work. 1 2
AiToolMap did not install Mosaic, synchronize proprietary coding sessions, test concurrent terminals, measure retrieval quality or evaluate cross-organization agent networking. The fixed 50-source panel found no eligible exact-product numeric review or benchmark. G2 results under the Mosaic name belong to unrelated resource-management/data products and are excluded as identity mismatches. The 8.0 rating is therefore LOW-confidence and not rank eligible. 4
Agent-session history can contain source code, credentials, customer information and strategic context. Teams should test repository/tenant scoping, secret filtering, access inheritance, deletion, export, retention and stale-context invalidation before treating synchronized history as durable memory. Mosaic's local replica, selective scope controls, read-only presentation and explicit no-product-telemetry statement are positive design signals, but they do not replace a full enterprise security review. 2
Mosaic targets a genuine problem in agent-heavy engineering teams: useful investigation history often disappears inside private Claude Code, Codex, Cursor and other sessions. The install path is unusually concrete. Mosaic documents a macOS background service, a local read-only replica at `~/.mosaic`, health/repair commands, selective backup scope, session handoff and supported-agent guidance. It explicitly says the installer does not modify coding agents, hooks, MCP servers or editor extensions and that the product does not collect product telemetry. 2
The current web product goes beyond archival memory. It presents live multiplayer terminals, persistent sessions that teammates can resume, agent-to-agent routing and research sandboxes for multi-agent simulations. YC's S26 profile independently confirms the company identity, two-person team and shared-memory/multiplayer direction; its launch material reports roughly 2,000 installs and 37 organizations syncing, but those are company-reported adoption figures rather than independently audited usage. 1 3
An exact September 2026 Wavect review reaches a similar conclusion: the context problem is real, but synchronized transcripts should not automatically be treated as trustworthy organizational memory. Provenance, stale-context handling, secret redaction, tenant/repository scope, deletion and selective retrieval remain core buyer questions. 4
Mosaic is a 2026 startup with a two-person team, and the product sits directly in a high-trust layer of the development workflow. Public documentation is strong on installation and session synchronization, but much thinner on public numeric pricing, enterprise retention, fine-grained authorization, secret-redaction guarantees, audit/export behavior and large-organization reliability. The current visible install path is also macOS-oriented. 2 3
Products matched by shared tasks, audience, workflow, product type and capabilities.