Unlocking the Codex harness: how we built the App Server

The article details the implementation of the Codex App Server, which utilizes a bidirectional JSON-RPC API to facilitate features such as streaming progress, tool usage, approval workflows, and diffs. This infrastructure allows for seamless integration of the Codex agent into applications, enhancing interactivity and responsiveness. For practitioners, this provides a robust framework for building applications that leverage Codex for code generation and manipulation tasks.