MCP vs ACP: different layers, and three ACPs
ACP means at least three things. For the Agent Client Protocol the answer is that it sits above MCP, not against it. Which ACP you mean, and how they stack.
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Scoring philosophy, MCP security, and what changed this week.
MCP vs A2A: what each protocol lets you inspect
A2A vs MCP, compared by what each one lets you see. MCP connects an agent to tools through schemas you can inspect. A2A connects agents as opaque peers.