Mapping MCP, A2A, and ACP: Telling AI Agent Protocols Apart in 2026
Article summary
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How this started: I went looking for ACP and it was gone I wanted to sort out the difference between MCP, ACP, and A2A. MCP I hear about constantly. A2A I knew by name. ACP I barely knew, so I opened its official repo ( github.com/i-am-bee/acp ). Here is what greeted me at the top of the README: ACP is now part of A2A under the Linux Foundation! The repo was archived on August 27, 2025 and set to read-only. In other words, ACP as a standalone protocol was over. It had been folded into A2A. A…
1Key Takeaways
- How this started: I went looking for ACP and it was gone I wanted to sort out the difference between MCP, ACP, and A2A.
- ACP I barely knew, so I opened its official repo ( github.com/i-am-bee/acp ).
- Here is what greeted me at the top of the README: ACP is now part of A2A under the Linux Foundation!
- The repo was archived on August 27, 2025 and set to read-only.
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3Why it matters
Coding AI shifts how fast software ships and how much human review each change needs. DEV — AI reports that how this started: I went looking for ACP and it was gone I wanted to sort out the difference between MCP, ACP, and A2A.
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