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For the complete documentation index, see llms.txt. Markdown versions of documentation pages are available by appending .md to the page URL.
Docs, videos, and demo apps for building with OpenAI
Goals are persistent objectives in Codex that keep a thread working toward a defined outcome across turns. A Goal gives Codex a completion condition: what should be true, how success should be checked, and what constraints must stay intact. Codex already works well for well-scoped coding tasks: inspect a repository, fix a bug, add a test, explain a failure, or implement a focused change. Goals are
Protocol Like MCP, codex app-server supports bidirectional communication using JSON-RPC 2.0 messages (with the "jsonrpc":"2.0" header omitted on the wire). Supported transports: stdio (--listen stdio://, default): newline-delimited JSON (JSONL). websocket (--listen ws://IP:PORT, experimental): one JSON-RPC message per WebSocket text frame. In WebSocket mode, app-server uses bounded queues. When re
Example workflows and tasks teams can take on with ChatGPT or Codex
If you’re new to Codex or coding agents in general, this guide will help you get better results faster. It covers the core habits that make Codex more effective across the CLI, IDE extension, and the Codex app, from prompting and planning to validation, MCP, skills, and automations. Codex works best when you treat it less like a one-off assistant and more like a teammate you configure and improve
Keep workflows in the repo In these repos, we use skills to capture repository-specific workflows. A skill is a small package of operational knowledge: a SKILL.md manifest, plus optional scripts/, references/, and assets/. The Codex customization docs describe why this works well: skills are a good fit for repeatable workflows because they can carry richer instructions, scripts, and references wit
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