A2A Agent Client

Author: Nacos
Version: 0.0.1
Type: Tool Plugin

Overview

A2A Agent Client is a Dify plugin that enables discovering and invoking remote A2A (Agent-to-Agent) agents. It supports multi-agent collaboration by allowing dynamic selection from pre-configured agents.

Features

• Two Discovery Modes

  • Nacos Mode: Discover agents from Nacos Agent Registry by name
  • URL Mode: Discover agents directly via their URLs

• Multi-Agent Collaboration: Configure multiple agents and let LLM dynamically select the most suitable one based on task requirements

• Two Tools

  • : Get information of all configured agents (name, description, skills)
  • : Call a selected agent with a query message

Installation

1. Download the plugin package ( file)
2. Go to your Dify instance → Plugins → Install Plugin
3. Upload the file
4. Configure provider credentials

Configuration

Provider Credentials

Parameter	Description	Required
	Nacos server address (e.g., ). Required for Nacos mode only.	No
	Nacos username	No
	Nacos password	No
	Aliyun AccessKey (for MSE Nacos)	No
	Aliyun SecretKey (for MSE Nacos)	No

Tool Parameters

Get A2A Agent Information

Parameter	Description	Form
	Discovery method: or	User Config
	Comma-separated agent names (Nacos mode)	User Config
	JSON mapping of names to URLs (URL mode)	User Config
	Nacos namespace ID (default: )	User Config

Call A2A Agent

Parameter	Description	Form
	Discovery method: or	User Config
	Comma-separated agent names (Nacos mode)	User Config
	JSON mapping of names to URLs (URL mode)	User Config
	Nacos namespace ID (default: )	User Config
	Agent to call (selected by LLM)	LLM
	Message to send to the agent	LLM

Usage Examples

Nacos Mode

URL Mode

Workflow

Requirements

• Dify >= 0.4.0
• Python 3.12+
• nacos-maintainer-sdk-python >= 0.5.1

License

Apache 2.0

Links

• GitHub Repository
• Nacos
• A2A Protocol
• Dify