Interoperability reference
Protocol Explorer
A practical map of standards and protocols that connect AI agents, tools, APIs, data and services. Filter by layer, compare roles, and follow primary sources.
Side-by-side comparison
| Protocol | Layer | Relationship | Best fit | Important boundary |
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Key idea: interoperability is layered. MCP and A2A are usually complementary, not mutually exclusive. OpenAPI, JSON Schema, authorization and RPC standards can sit underneath or beside them.