mcp: export Server.Discover for host introspection - #1129
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Expose the SEP-2575 discover payload as Server.Discover so hosts can inspect capabilities/instructions/supportedVersions without synthesizing an inbound request. Inbound server/discover still establishes session identity; customization continues via receiving middleware. Fixes modelcontextprotocol#1092
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Summary
Fixes #1092.
server/discoverwas only reachable as an inbound JSON-RPC method. Hosts that need the same advertisement for health/introspection (or multi-tenant gateways) had to synthesize an HTTP/JSON-RPC request against themselves.This exports
Server.Discover(ss *ServerSession) *DiscoverResult:ss == nil→ full SDK-supported version list + current capabilities/instructionsss != nil→ that session’s transport-filteredSupportedVersionsserver/discoverstill establishes session identity via the internal handler, which now builds its payload throughDiscoverServer.AddReceivingMiddleware(per maintainer guidance on the issue; noDiscoverHandleroption)Related but distinct from open #947 (
SupportedVersionsonServerOptions) — that PR configures which versions are supported; this PR only exposes the host-callable discover result builder.Test plan
go test ./mcp/ -run TestServerDiscover— nil-session defaults, session path, no state mutationgo test ./...greenTestInMemory_E2E_DiscoverSuccess,TestClientConnectDiscover)