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mcp: negotiate protocol version (#112)

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Negotiate the protocol version properly, and set the header on HTTP
transports.

We follow the logic of the Typescript SDK.

- On initialization, the client sends the latest version it can support,
and accepts the version that the server returns if the client supports
it. If not, the connection fails.

- The server accepts the client's version unless it doesn't support it,
in which case it replies with its latest version.

Fixes #103.
This commit is contained in:
Jonathan Amsterdam 2025-07-10 11:06:55 -04:00 • committed by GitHub
commit c037ba51d2
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1 changed files with 73 additions and 16 deletions
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10
mcp/shared.go
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@ -22,6 +22,16 @@ import (
"github.com/modelcontextprotocol/go-sdk/internal/jsonrpc2"
)
// latestProtocolVersion is the latest protocol version that this version of the SDK supports.
// It is the version that the client sends in the initialization request.
const latestProtocolVersion = "2025-06-18"
var supportedProtocolVersions = []string{
latestProtocolVersion,
"2025-03-26",
"2024-11-05",
}
// A MethodHandler handles MCP messages.
// For methods, exactly one of the return values must be nil.
// For notifications, both must be nil.