5c680c6587
Adds a `GET account/rateLimits/read` API to app-server. This calls the codex backend to fetch the user's current rate limits. This would be helpful in checking rate limits without having to send a message. For calling the codex backend usage API, I generated the types and manually copied the relevant ones into `codex-backend-openapi-types`. It'll be nice to extend our internal openapi generator to support Rust so we don't have to run these manual steps. # External (non-OpenAI) Pull Request Requirements Before opening this Pull Request, please read the dedicated "Contributing" markdown file or your PR may be closed: https://github.com/openai/codex/blob/main/docs/contributing.md If your PR conforms to our contribution guidelines, replace this text with a detailed and high quality description of your changes.
codex-app-server
codex app-server is the harness Codex uses to power rich interfaces such as the Codex VS Code extension. The message schema is currently unstable, but those who wish to build experimental UIs on top of Codex may find it valuable.
Protocol
Similar to MCP, codex app-server supports bidirectional communication, streaming JSONL over stdio. The protocol is JSON-RPC 2.0, though the "jsonrpc":"2.0" header is omitted.
Message Schema
Currently, you can dump a TypeScript version of the schema using codex generate-ts. It is specific to the version of Codex you used to run generate-ts, so the two are guaranteed to be compatible.
codex generate-ts --out DIR