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Where mpl fits
mpl is not a replacement for a transport protocol. It’s a layer that adds typed contracts, quality measurement, and audit trails on top of whatever transport you use. The comparisons below stay narrow — protocol layer only.
mpl vs MCP
MCP defines how an agent talks to a tool server. mpl is the contract / quality / audit layer that runs on top.
Read the comparison →mpl vs A2A
A2A defines peer-to-peer agent messaging. mpl is what makes those messages typed, scored, and provable.
Read the comparison →More comparisons land as we ship them. Each row is sourced to public docs.