Everything in the catalog

Open folder format (a SKILL.md plus optional scripts and files) for packaging instructions an agent loads on demand.

Plain Markdown file at a repository root that tells coding agents how to build, test and work in the project.

Proposal for a Markdown /llms.txt file that gives language models a short, curated map of a website's content.

OpenTelemetry attribute names and signal shapes for tracing LLM calls, agents, tool execution and MCP operations.

Framework-neutral configuration language for describing agents and flows so they can be serialized and run on different runtimes.

OpenAI's toolkit for building ChatGPT plugins from MCP servers, skills and optional in-chat UI, now documented under Plugins.