OpenAI Agents SDK 0.13 Ships WebSocket Transport for Responses API and MCP Resource Support

GitHub / OpenAI·medium signal

OpenAI released Agents SDK v0.13.0-0.13.3 (March 23-31) adding WebSocket transport for the Responses API as an opt-in alternative to HTTP, enabling persistent low-latency connections for multi-turn agent sessions. The release also adds list_resources(), list_resource_templates(), and read_resource() to MCPServer — bringing MCP Resource support to the OpenAI ecosystem for the first time, and defaults Realtime agents to gpt-realtime-1.5.