OpenAI Codex App Server Lets Developers Control AI Agents via JSON-RPC

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OpenAI's Codex App Server is a tool that allows developers to control Codex AI agents programmatically using JSON-RPC, rather than through the standard command-line interface. The server is launched with a single command and listens on standard input, accepting JSONL-formatted requests. Interactions are structured around two core concepts: Threads, which represent full sessions, and Turns, which are individual user-agent exchanges within a session. Developers can use this interface to build custom graphical interfaces, task queues, or orchestration layers on top of Codex. Full protocol specifications are available in the official README on OpenAI's GitHub repository.

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