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OpenAI documents the Codex App Server, the JSON-RPC layer every Codex surface actually runs on
OpenAI published an engineering post explaining that the CLI, IDE extension, macOS app and Codex Web all sit on the same harness, linked by the Codex App Server, a bidirectional JSON-RPC-over-stdio process that hosts core threads and translates client requests into Codex operations. Partners have written clients in Go, Python, TypeScript, Swift and Kotlin, and TypeScript definitions can be generated straight from the Rust protocol. OpenAI names App Server the first-class integration path it will maintain, and refactored its own TUI to use it, which unlocks running the agent on a remote machine while the laptop sleeps.
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