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Implement client protocol version negotiation in server initialization (#107)

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* Implement client version negotiation in server initialization

* Add test coverage for version negotiation

* Make Version.supported and Version.negotiate() APIs internal to not create new surface area
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Mattt 2025-05-07 05:58:11 -07:00 • committed by GitHub
commit 720a8102e9
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1 changed files with 80 additions and 5 deletions
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11
Sources/MCP/Server/Server.swift
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@ -486,15 +486,20 @@ public actor Server {
try await hook(params.clientInfo, params.capabilities)
}
// Set initial state
// Perform version negotiation
let clientRequestedVersion = params.protocolVersion
let negotiatedProtocolVersion = Version.negotiate(
clientRequestedVersion: clientRequestedVersion)
// Set initial state with the negotiated protocol version
await self.setInitialState(
clientInfo: params.clientInfo,
clientCapabilities: params.capabilities,
protocolVersion: params.protocolVersion
protocolVersion: negotiatedProtocolVersion
)
return Initialize.Result(
protocolVersion: Version.latest,
protocolVersion: negotiatedProtocolVersion,
capabilities: await self.capabilities,
serverInfo: self.serverInfo,
instructions: nil