Upstash ships an MCP toolkit for long-running Tasks and webhook Events in TypeScript servers
Released Oct 9 as part of Upstash AgentKit, @upstash/mcp-toolkit sits on the official MCP TypeScript SDK and adds the spec's Tasks extension for long-running tools plus Events, a not-yet-spec proposal for waking an agent via webhooks. Client support is thin: as of Oct 7, ChatGPT handles Events in Work chats, while Claude Code, Codex, and Cursor support neither.