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ACP took a REST-first approach with peers discovered via an Agent Manifest and called over HTTP before merging into A2A, and in production MCP and A2A are complementary rather than competing: MCP handles tool access while A2A handles agent-to-agent communication.
ACP's REST-based agent communication approach was folded into A2A, and today MCP and A2A are used together for tool access versus agent-to-agent coordination. ✦ AI generated
ByteByteGo · ByteByteGo Newsletter · 2026-07-18 · original ↗
ACP took a REST-first approach. Peers were discovered through an Agent Manifest, called directly over HTTP, and responded to sync for low-latency tasks or via async SSE stream. In production, MCP and A2A are complementary. MCP handles tool access, A2A handles agent communication.
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- ·Peers discovered via an Agent Manifest
- ·Called directly over HTTP
- ·Sync responses for low-latency tasks
- ·Async via SSE stream otherwise
- ·ACP's REST-first approach folded into A2A
- ·No longer a separate competing protocol
- ·MCP and A2A are complementary, not competing
- ·MCP handles tool access
- ·A2A handles agent-to-agent communication
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