n8n is a visual, node-based automation platform whose AI Agent node lets you embed LLM-driven reasoning steps inside otherwise deterministic multi-step workflows.

The Microsoft Agent Framework is an open-source SDK and runtime for building and orchestrating production-grade AI agents and multi-agent systems.

OpenAI’s custom GPTs are a no-code/low-code way to build specialized versions of ChatGPT that behave as simple AI agents, combining instructions, private knowledge, and built-in or external tools.

A reference to OpenAI’s AgentKit — the developer framework for designing, visualizing, and deploying multi-step AI agents. Covers its architecture, connector registry, guardrails, observability, and how it complements Agent Builder.

A reference to OpenAI’s Agent Builder — the low-code interface for creating custom AI agents inside ChatGPT or via the API. Covers its purpose, architecture, configuration workflow, governance, and where it sits next to AgentKit.