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Codex App Server

Codex App Server is an open-source JSON-RPC protocol for embedding the Codex harness in custom applications and interfaces. It underlies the Codex app and IDE integrations, and can be used by third-party clients through its client messages and SDKs.

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Overview

The server supports sign-in with ChatGPT, layered developer instructions, dynamic and deferred tools, and per-thread model and sandbox settings. It can be distributed as a binary, with generated bindings and a Python SDK available for integration.

What Codex App Server is used for

1 use taken from transcripts — each links to the moment in the video.

  • An open-source JSON-RPC protocol that wraps the Codex harness, letting developers build custom clients and interfaces on top of Codex. It powers the Codex app, IDE extensions, and third-party clients like Xcode, JetBrains, and T3 Code, and supports 120+ client messages, sign in with ChatGPT, developer instructions, dynamic/deferred tools, and per-thread model and sandbox settings.

    AI Engineer02:47

Videos mentioning Codex App Server

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