Interoperability and control surfaces created by agent communication protocols.
Protocols make tools and agents interoperable, but they also standardise discovery, delegation and context exchange. Those interfaces need explicit trust and policy controls.
Review an MCP server as a privileged protocol adapter: verify tool semantics, OAuth boundaries, token audience, downstream delegation, input handling, isolation, logging and consent.
Multi-agent systems fail between workers when goals, evidence, state, authority and completion semantics do not survive the transfer. Test the protocol, not just each agent.
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Read the method, assumptions and questions to ask.