Glossary · term146 of 202
protocol version field
A value identifying which revision of the MCP spec a client speaks, negotiated once at startup under the old handshake and now restated on every request.
also written as protocolVersion
Related terms
client capabilities fieldA metadata block listing what optional features a client supports, which MCP servers are explicitly forbidden from caching between requests.view termclient info fieldA metadata block carrying a client's name and version string, sent once at handshake under the old MCP spec and repeated on every call under the new one.view terminitialize handshakeThe one-time exchange at the start of an MCP connection where a client and server negotiated protocol version and capabilities before any tool calls happened.view term
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