Evergreen by Carta: Multiplayer coding platform where teams+agents ship together

Evergreen is a cloud-based collaborative coding platform built by Carta to let engineers and AI agents work in shared sessions rather than isolated chat windows and laptops. Carta’s CEO argues that AI assistants had helped engineers write and review code faster, but output remained constrained because work could not easily be seen, resumed, or extended by others - and agents stopped when their users went offline. Evergreen is model-agnostic, supports Claude, Codex, Grok, and Muse, and works with existing plugins and MCP servers. Its security features include isolated sessions, scoped access, audit logs, and spending caps.

Carta reports that weekly pull requests increased from about 1,300 in January to nearly 20,000 by early November 2026, describing the result as 15 times more output, delivery more than six times faster, and an 80% lower revert rate. More than 80% of Carta employees use the platform. In one example, a Datadog alert can launch a shared debugging session where colleagues join and guide an agent without relying on a screen share. In another, an automation removed nearly 1,600 obsolete feature flags in a month, with each change checked, reviewed, and merged. The central distinction is that Evergreen aims to carry work beyond code generation through review and deployment, and Carta is now offering it to other companies with a seven-day free trial.