Emerging Tech & Next-Level Software · AI agents, standards & the agent-ready web

# Agent2Agent (A2A) Protocol

An open protocol, introduced by Google in 2025 and now developed under the Linux Foundation, that lets AI agents from different vendors discover each other, hand off tasks and collaborate securely.

Also searched as: A2A · agent-to-agent protocol

## What it does

- Agent discovery through published agent cards
- Task hand-offs between agents
- Secure authentication
- Works alongside MCP

### Who uses it

Software companies and businesses whose AI agents need to work with partners’ or vendors’ agents.

### Well-known examples

Google Agent Development Kit · Salesforce Agentforce · SAP Joule · Microsoft Azure AI Foundry

How AI is changing it

If MCP connects an agent to tools, A2A connects agents to each other, setting the stage for a supplier’s agent negotiating directly with a buyer’s agent.

## Buy, build or connect?

- [Custom AI Agent Development](https://wisconsintechshop.com/ai-integration/ai-agents-development/): AI agents that do multi-step work (research, data entry, follow-ups, scheduling, reporting) inside your systems, with clear permissions and human approval. (From $2,000)
- [MCP Servers & AI-Agent-Ready Business Data](https://wisconsintechshop.com/ai-integration/mcp-server-development/): Make your business usable by AI assistants and agents: MCP servers and APIs that let tools like Claude and ChatGPT check stock, book, quote or order, safely. (From $1,500)

## Related software

- [MCP Server](https://wisconsintechshop.com/software/ai-software/mcp-server/)
- [Multi-Agent System](https://wisconsintechshop.com/software/ai-software/multi-agent-system/)
- [AI Digital Employee](https://wisconsintechshop.com/software/emerging-tech-software/ai-digital-employee/)
- [NLWeb](https://wisconsintechshop.com/software/emerging-tech-software/nlweb/)
- [llms.txt](https://wisconsintechshop.com/software/emerging-tech-software/llms-txt/)
- [Generative Engine Optimization (GEO)](https://wisconsintechshop.com/software/emerging-tech-software/generative-engine-optimization/)
- [Agent & Non-Human Identity Security](https://wisconsintechshop.com/software/emerging-tech-software/non-human-identity/)

## Questions about Agent2Agent (A2A) protocols

### What is a Agent2Agent (A2A) protocol?

An open protocol, introduced by Google in 2025 and now developed under the Linux Foundation, that lets AI agents from different vendors discover each other, hand off tasks and collaborate securely.

### How is AI changing Agent2Agent (A2A) protocols?

If MCP connects an agent to tools, A2A connects agents to each other, setting the stage for a supplier’s agent negotiating directly with a buyer’s agent.

## Need a Agent2Agent (A2A) protocol set up, connected or built?

Tell us what you use today and what you need it to do. We will tell you honestly whether to buy, build or connect, with a fixed quote.

- Big projects and small ones are all welcome
- Fixed-price quotes, no surprise invoices
- You own your code, data and accounts
- A client portal to track progress, invoices and payments
- Rooted in Wisconsin, serving businesses nationwide

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