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mcp: allow restricting the protocol versions a server supports (#1199)

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Fixes #945
This commit is contained in:
Guglielmo Colombo 2026-08-28 16:06:10 +02:00 • committed by GitHub
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14
internal/docs/protocol.src.md
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@ -72,6 +72,20 @@ request. Servers implementing `2026-07-28` MUST implement it.
fails or the server does not support the latest version, the client falls back to the
legacy `initialize` handshake.
A server advertises and negotiates every protocol version the SDK supports;
set [`ServerOptions.SupportedProtocolVersions`](https://pkg.go.dev/github.com/modelcontextprotocol/go-sdk/mcp#ServerOptions)
to narrow that set, for example to stop serving a revision your deployment has
retired.
```go
server := mcp.NewServer(&mcp.Implementation{Name: "server", Version: "v1.0.0"}, &mcp.ServerOptions{
SupportedProtocolVersions: []string{"2026-07-28", "2025-11-25"},
})
```
The set can only narrow support, never widen it; the field's documentation
covers how each protocol era answers a request at an excluded version.
### Per-request metadata keys
When the negotiated protocol version is `2026-07-28` or later, every request