One API key and one SDK for email, SMS, AI agent inboxes, scheduling, webhooks and more.
cosscom/coss is the official Cal.com design system, providing reusable interface components and related applications for building its web experiences. It is organized as a TypeScript monorepo, meaning multiple apps and shared packages live and develop together in one repository.
Latest release [email protected] — coss-cli 0.7.0 · 5 Nov 2026
2 files for Codex, OpenCode and Claude Code: coss AGENTS.md, coss CLAUDE.md — 32,566 tokens loaded in every session.
AGENTS.md A 32,561 tok CLAUDE.md A 5 tok These files are cosscom/coss's own configuration — they tell Codex, OpenCode and Claude Code how to work on this repository, so they are not mods to install elsewhere. Copy one as a starting point and replace the parts that are about this project.