Overview

AgentScope offers a few protocol adapters to let an Agent talk to the outside world. Each solves a different problem:

Extension	Protocol	Problem it solves
A2A	Agent-to-Agent	Agents calling each other / composing into multi-agent workflows
AG-UI	AG-UI Protocol	Standardized event stream for front-end UIs
Agent Protocol	Agent Protocol	HTTP-based way for other systems to submit “tasks”

See also Chat Completions Web: expose your Agent behind an OpenAI-compatible API.

Choosing one

Stream Agent events to a front-end UI (incl. ThinkingBlock) → AG-UI
Let other backend systems schedule the Agent over REST / host a remote subagent → Agent Protocol
Let multiple Agents (yours or third-party) call each other → A2A

Layering: AG-UI is user-facing; Agent Protocol is the internal remote-subagent / task HTTP surface; A2A is external interop.