OpenAI MCP Events: ChatGPT plugins react via signed webhooks
OpenAI’s DevDay MCP Events let ChatGPT plugins subscribe to MCP server updates (messages, comments, status) and trigger automations over verified signed HTTPS webhooks. Servers need MCP 2.0 (protocol 2026-07-28) with events/list, events/subscribe, and events/unsubscribe; polling and streaming aren’t supported.