OpenAI Open-Sources Codex Harness to Let Developers Embed Agent Loops in Their Own Products
OpenAI open-sourced the Codex harness under Apache-2.0, exposing the agent loop that powers its coding tools so developers can embed it in dashboards, CRMs, and internal apps. The release includes a CLI, SDK, and JSON-RPC app-server with built-in approval flows and MCP tool support.